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s-8353/8354 series www.sii-ic.com step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator ? seiko instruments inc., 2002-2010 rev.3.0 _00 seiko instruments inc. 1 the s-8353/8354 series is a cmos step-up sw itching regulator which mainly consis ts of a reference voltage source, an oscillation circuit, a power mos fet, an error amplifier, a phas e compensation circuit, a pwm control circuit (s-8353 series) and a pwm / pfm switching control circuit (s-8354 series). the s-8353/8354 series can configure the step-up switching regulator with an external coil, capacitor, and diode. in addition to the above features, the sma ll package and low current consumption make the s-8353/8354 series ideal for portable equipment applications requiring high efficiency. the s-8353 series realizes low ripple, high efficiency, and excell ent transient characteristics due to its pwm control circuit whose duty ratio can be varied linearly from 0% to 83% (from 0% to 78% for 250 khz models), an excellently designed error amplifier, and phase compensation circuits. the s-8354 series features a pwm / pfm switching controller t hat can switch the operation to a pfm controller with a duty ratio is 15% under a light load to prevent a decline in the efficiency due to the ic operating current. ? features ? low voltage operation: st artup at 0.9 v min. (i out = 1 ma) guaranteed ? low current consumpti on : during operation 18.7 a (3.3 v, 50 khz, typ.) during shutdown: 0.5 a (max.) ? duty ratio : built-in pwm / pfm swit ching control circuit (s-8354 series) 15 % to 83 % (30 khz and 50 khz models) 15 % to 78 % (250 khz models) ? external parts : coil, capacitor, and diode ? output voltage : selectable in 0.1 v steps between 1.5 v and 6.5 v (for v dd / v out separate types) selectable in 0.1 v steps between 2.0 v and 6.5 v (for other than v dd / v out separate types) ? output voltage accuracy : 2.4% ? oscillation frequency : 30 khz, 50 khz, and 250 khz selectable ? soft start function : 6 ms (50 khz, typ.) ? lead-free, sn 100%, halogen-free *1 *1. refer to ? ? product name structure ? for details. ? applications ? power supplies for portable equipment such as digital cameras, electronic notebooks, and pdas ? power supplies for audio equipment such as portable cd / md players ? constant voltage power supplies for cameras, vcrs, and communication devices ? power supplies for microcomputers ? packages ? sot-23-3 ? sot-23-5 ? sot-89-3
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator s-8353/8354 series rev.3.0 _00 seiko instruments inc. 2 ? block diagrams (1) a, c and h types (without shutdown function) cont vout oscillation circuit pwmcontrol circuit or pwm / pfm swiching control circuit vss phase compensation circuit soft start built-in reference power supply ic internal power supply + ? figure 1 (2) a and h types (with shutdown function) cont vout oscillation circuit pwmcontrol circuit or pwm / pfm swiching control circuit vss off/on soft start built-in reference power supply phase compensation circuit ic internal power supply + ? figure 2 (3) d and j types (v dd / v out separate type) cont vout vdd oscillation circuit pwmcontrol circuit or pwm / pfm swiching control circuit vss ic internal power supply soft start built-in reference power supply phase compensation circuit + ? figure 3
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator rev.3.0 _00 s-8353/8354 series seiko instruments inc. 3 ? product name structure the control system, product types, out put voltage, and packages for the s-8353/ 8354 series can be selected at the user?s request. please refer to the ? 3. product name ? for the definition of the product name, ? 4. package ? regarding the package drawings and ? 5. product name list ? for the full product names. 1. function list (1) pwm control products table 1 product name switching frequency [khz] shutdown function v dd / v out separate type package application s-8353axxmc 50 yes ? sot-23-5 applications requiring shutdown function s-8353axxma 50 ? ? sot-23-3 applications not requiring shutdown function s-8353axxua 50 ? ? sot-89-3 applications not requiring shutdown function s-8353cxxma 30 ? ? sot-23-3 for pager s-8353cxxua 30 ? ? sot-89-3 for pager s-8353dxxmc 50 ? yes sot-23-5 applications requiring variable output voltage with an external resistor s-8353hxxmc 250 yes ? sot-23-5 applications requiring a shutdown function and a thin coil s-8353hxxma 250 ? ? sot-23-3 applications not requiring a shutdown function and requiring a thin coil s-8353hxxua 250 ? ? sot-89-3 applications not requiring a shutdown function and requiring a thin coil s-8353jxxmc 250 ? yes sot-23-5 applications requiring variable output voltage with an external resistor and a thin coil (2) pwm / pfm switching control products table 2 product name switching frequency [khz] shutdown function v dd / v out separate type package application s-8354axxmc 50 yes ? sot-23-5 applications requiring shutdown function s-8354axxma 50 ? ? sot-23-3 applications not requiring shutdown function s-8354axxua 50 ? ? sot-89-3 applications not requiring shutdown function s-8354cxxma 30 ? ? sot-23-3 for pager s-8354dxxmc 50 ? yes sot-23-5 applications requiring variable output voltage with an external resistor s-8354hxxmc 250 yes ? sot-23-5 applications requiring a shutdown function and a thin coil s-8354hxxma 250 ? ? sot-23-3 applications not requiring a shutdown function and requiring a thin coil s-8354hxxua 250 ? ? sot-89-3 applications not requiring a shutdown function and requiring a thin coil s-8354jxxmc 250 ? yes sot-23-5 applications requiring variable output voltage with an external resistor and a thin coil
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator s-8353/8354 series rev.3.0 _00 seiko instruments inc. 4 2. package and function list by product type table 3 series name type package name (abbreviation) shutdown function yes / no v dd / v out separate type yes / no mc yes a (normal product or with shutdown function) a = 50 khz ma / ua no no c (normal product) c = 30 khz ma no no d (v dd / v out separate type) d = 50 khz mc no yes mc yes h (normal product or with shutdown function) h = 250 khz ma / ua no no s-8353 series, s-8354 series j (v dd / v out separate type) j = 250 khz mc no yes 3. product name (1) sot-23-3 s-835 x x xx ma - xxx xx x environmental code u : lead-free (sn 100%), halogen-free g : lead-free (for details, please contact our sales office) ic direction in ta pe specifications *1 t1 : product of environmental code = u t2 : product of environmental code = g product code *2 package code ma : sot-23-3 output voltage 15 to 65 (e.g. when the output voltage is 1.5 v, it is expressed as 15.) product type a : normal products (sot-23-3, sot-89-3) or with shutdown function products (sot-23-5), f osc = 50 khz c : normal products, f osc = 30 khz d : v dd / v out separate type, f osc = 50 khz h : normal products (sot-23-3, sot-89-3) or with shutdown function products (sot-23-5), f osc = 250 khz j : v dd / v out separate type, f osc = 250 khz control system 3 : pwm control 4 : pwm / pfm switching control *1. refer to the tape specifications. *2. refer to the table 4 to table 8 in the ? 5. product name list ?.
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator rev.3.0 _00 s-8353/8354 series seiko instruments inc. 5 (2) sot-23-5, sot-89-3 s-835 x x xx xx - xxx t2 x environmental code u : lead-free (sn 100%), halogen-free g : lead-free (for details, please contact our sales office) ic direction in tape specifications *1 product code *2 package code mc : sot-23-5 ua : sot-89-3 output voltage 15 to 65 (e.g. when the output voltage is 1.5 v, it is expressed as 15.) product type a : normal products (sot-23-3, sot-89-3) or with shutdown function products (sot-23-5), f osc = 50 khz c : normal products, f osc = 30 khz d : v dd / v out separate type, f osc = 50 khz h : normal products (sot-23-3, sot-89-3) or with shutdown function products (sot-23-5), f osc = 250 khz j : v dd / v out separate type, f osc = 250 khz control system 3 : pwm control 4 : pwm / pfm switching control *1. refer to the tape specifications. *2. refer to the table 4 to table 8 in the ? 5. product name list ?. 4. package drawing code package name package tape reel environmental code = g mp003-a-p- sd mp003-a-c-sd mp003-a-r-sd sot-23-3 environmental code = u mp003-c-p- sd mp003-c-c-sd mp003-z-r-sd sot-23-5 mp005-a-p-sd mp005-a-c-sd mp005-a-r-sd sot-89-3 up003-a-p-sd up 003-a-c-sd up003-a-r-sd
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator s-8353/8354 series rev.3.0 _00 seiko instruments inc. 6 5. product name list (1) s-8353 series table 4 output voltage s-8353axxmc series s-8353axxma series s-8353axxua series s-8353cxxma series 2.0 v s-8353a20mc-iqft2x ? ? ? 2.5 v s-8353a25mc-iqkt2x ? ? ? 2.7 v s-8353a27mc-iqmt2x ? ? ? 2.8 v s-8353a28mc-iqnt2x ? ? ? 3.0 v s-8353a30mc-iqpt2x s-8353a30ma-iqpt ?? s-8353a30ua-iqpt2x s-8353c30ma-ispt ?? 3.3 v s-8353a33mc-iqst2x s-8353a33ma-iqst ?? s-8353a33ua-iqst2x ? 3.5 v s-8353a35mc-iqut2x ? ? ? 3.6 v ? ? s-8353a36ua-iqvt2x ? 3.8 v s-8353a38mc-iqxt2x ? s-8353a38ua-iqxt2x ? 4.0 v ? ? s-8353a40ua-iqzt2x ? 4.5 v s-8353a45mc-iret2x ? ? ? 4.6 v ? ? ? s-8353c46ma-itft ?? 5.0 v s-8353a50mc-irjt2x s-8353a50ma-irjt ?? s-8353a50ua-irjt2x ? 5.5 v s-8353a55mc-irot2x ? s-8353a55ua-irot2x ? table 5 output voltage s-8353cxxua series s-8353dxxmc series s-8353hxxmc series s-8353hxxma series 2.0 v ? s-8353d20mc-iuft2x s-8353h20mc-iwft2x ? 2.6 v ? ? s-8353h26mc-iwlt2x ? 2.8 v ? ? s-8353h28mc-iwnt2x ? 3.0 v s-8353c30ua-ispt2x s-8353d30mc-iupt 2x s-8353h30mc-iwpt2x s-8353h30ma-iwpt ?? 3.1 v ? ? s-8353h31mc-iwqt2x ? 3.2 v ? ? s-8353h32mc-iwrt2x ? 3.3 v ? ? s-8353h33mc-iwst2x s-8353h33ma-iwst ?? 3.5 v ? ? s-8353h35mc-iwut2x ? 3.7 v ? ? s-8353h37mc-iwwt2x ? 3.8 v ? ? s-8353h38mc-iwxt2x ? 4.0 v ? ? s-8353h40mc-iwzt2x ? 4.5 v ? ? s-8353h45mc-ixet2x ? 5.0 v ? s-8353d50mc-ivjt2x s-8353h50mc-ixjt2x ? 6.0 v ? ? s-8353h60mc-ixtt2x ? 6.5 v ? ? s-8353h65mc-ixyt2x ? remark 1. please contact the sii marketing depar tment for products with an output volt age other than those specified above. 2. x: g or u 3. ??: 2g or 1u 4. please select products of environmental code = u for sn 100%, halogen-free products.
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator rev.3.0 _00 s-8353/8354 series seiko instruments inc. 7 table 6 output voltage s-8353hxxua series s-8353jxxmc series 1.8 v ? s-8353j18mc-iydt2x 2.0 v ? s-8353j20mc-iyft2x 2.1 v ? s-8353j21mc-iygt2x 2.5 v ? s-8353j25mc-iykt2x 3.0 v ? s-8353j30mc-iypt2x 3.3 v s-8353h33ua-iwst2x s-8353j33mc-iyst2x 3.6 v s-8353h36ua-iwvt2x ? 5.0 v s-8353h50ua-ixjt2x s-8353j50mc-izjt2x (2) s-8354 series table 7 output voltage s-8354axxmc series s-8354axxma series s-8354axxua series s-8354cxxma series 2.0 v ? s-8354a20ma-jqft ?? ? ? 2.7 v s-8354a27mc-jqmt 2x s-8354a27ma-jqmt ?? ? ? 2.8 v ? s-8354a28ma-jqnt ?? s-8354a28ua-jqnt2x ? 3.0 v s-8354a30mc-jqpt 2x s-8354a30ma-jqpt ?? s-8354a30ua-jqpt2x s-8354c30ma-jspt ?? 3.3 v s-8354a33mc-jqst 2x s-8354a33ma-jqst ?? s-8354a33ua-jqst2x ? 3.5 v ? ? s-8354a35ua-jqut2x ? 3.8 v s-8354a38mc-jqxt2x ? ? ? 4.0 v s-8354a40mc-jqzt2x ? s-8354a40ua-jqzt2x ? 5.0 v s-8354a50mc-jrjt2x s-8354a50ma-jrjt ?? s-8354a50ua-jrjt2x ? table 8 output voltage s-8354dxxmc series s-8354hxxmc series s-8354hxxua series s-8354jxxmc series 1.5 v ? ? ? s-8354j15mc-jyat2x 2.0 v s-8354d20mc-juft2x ? ? s-8354j20mc-jyft2x 2.5 v ? s-8354h25mc-jwkt2x ? ? 2.7v ? s-8354h27mc-jwmt2x s-8354h27ua-jwmt2x ? 3.0 v s-8354d30mc-jupt2x s-8354h30mc-jwpt2x ? s-8354j30mc-jypt2x 3.1 v ? s-8354h31mc-jwqt2x ? ? 3.3 v s-8354d33mc-just2x s-8354h33mc-jwst2x ? s-8354j33mc-jyst2x 3.5 v ? s-8354h35mc-jwut2x ? ? 4.0 v ? s-8354h40mc-jwzt2x ? ? 4.2 v ? s-8354h42mc-jxbt2x ? ? 4.5 v ? s-8354h45mc-jxet2x ? ? 4.7 v ? s-8354h47mc-jxgt2x ? ? 5.0 v ? s-8354h50mc-jxjt2x ? s-8354j50mc-jzjt2x remark 1. please contact the sii marketing depar tment for products with an output volt age other than those specified above. 2. x: g or u 3. ??: 2g or 1u 4. please select products of environmental code = u for sn 100%, halogen-free products.
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator s-8353/8354 series rev.3.0 _00 seiko instruments inc. 8 ? pin configurations table 9 a, c and h types (without shutdown function, v dd / v out non-separate type) pin no. symbol description 1 vout output voltage pin and ic power supply pin 2 vss gnd pin 3 cont external inductor connection pin 1 2 3 sot-23-3 top view figure 4 table 10 a and h types (with shutdown function, v dd / v out non-separate type) pin no. symbol description 1 off/on shutdown pin ?h?: normal operation (step-up operating) ?l?: step-up stopped (ent ire circuit stopped) 2 vout output voltage pin and ic power supply pin 3 nc *1 no connection 4 vss gnd pin sot-23-5 top view 5 4 3 2 1 5 cont external inductor connection pin figure 5 *1. the nc pin indicates electrically open. table 11 d and j types (without shutdown function, v dd / v out separate type) pin no. symbol description 1 vout output voltage pin 2 vdd ic power supply pin 3 nc *1 no connection 4 vss gnd pin 5 cont external inductor connection pin *1. the nc pin indicates electrically open. table 12 a and h types (without shutdown function, v dd / v out non-separate type) pin no. symbol description 1 vss gnd pin 2 vout output voltage pin and ic power supply pin 3 cont external inductor connection pin sot-89-3 top view 3 2 1 figure 6
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator rev.3.0 _00 s-8353/8354 series seiko instruments inc. 9 ? absolute maximum ratings table 13 (ta = 25 c unless otherwise specified) item symbol absolute maximum rating unit vout pin voltage v out v ss ? 0.3 to v ss + 12 v off/ on pin voltage *1 off/on v v ss ? 0.3 to v ss + 12 v vdd pin voltage *2 v dd v ss ? 0.3 to v ss + 12 v cont pin voltage v cont v ss ? 0.3 to v ss + 12 v cont pin current i cont 300 ma 150 (when not mounted on board) mw sot-23-3 430 *3 mw 250 (when not mounted on board) mw sot-23-5 600 *3 mw 500 (when not mounted on board) mw power dissipation sot-89-3 p d 1000 *3 mw operating ambient temperature t opr ? 40 to + 85 c storage temperature t stg ? 40 to + 125 c *1. with shutdown function *2. for v dd / v out separate type *3. when mounted on board [mounted board] (1) board size : 114.3 mm 76.2 mm t1.6 mm (2) board name : jedec standard51-7 caution the absolute maximum ra tings are rated values exceeding whic h the product could suffer physical damage. these values must therefor e not be exceeded under any conditions. (1) when mounted on board (2) when not mounted on board 0 50 100 150 800 400 0 power dissipation (p d ) [mw] ambient temperature (ta) [ c] 1000 600 200 1200 sot-23-3 sot-23-5 sot-89-3 0 50 100 150 400 200 0 power dissipation (p d ) [mw] ambient temperature (ta) [ c] 500 300 100 600 sot-23-3 sot-23-5 sot-89-3 figure 7 power dissipation of packages
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator s-8353/8354 series rev.3.0 _00 seiko instruments inc. 10 ? electrical characteristics (1) 50 khz product (a and d types) table 14 (ta = 25 c unless otherwise specified) item symbol condition min. typ. max. unit measurement circuit output voltage v out ? v out(s) 0.976 v out(s) v out(s) 1.024 v 2 input voltage v in ? ? ? 10 v 2 operation start voltage v st1 i out = 1 ma ? ? 0.9 v 2 oscillation start voltage v st2 no external parts, voltage applied to v out ? ? 0.8 v 1 operation holding voltage v hld i out = 1 ma, judged by decreasing v in voltage gradually 0.7 ? ? v 2 s-835xx15 to 19 ? 10.8 18.0 a 1 s-835xx20 to 29 ? 13.3 22.2 a 1 s-835xx30 to 39 ? 18.7 31.1 a 1 s-835xx40 to 49 ? 24.7 41.1 a 1 s-835xx50 to 59 ? 31.0 51.6 a 1 current consumption 1 i ss1 v out = v out(s) 0.95 s-835xx60 to 65 ? 37.8 63.0 a 1 s-835xx15 to 19 ? 4.8 9.5 a 1 s-835xx20 to 29 ? 5.0 9.9 a 1 s-835xx30 to 39 ? 5.1 10.2 a 1 s-835xx40 to 49 ? 5.3 10.6 a 1 s-835xx50 to 59 ? 5.5 10.9 a 1 current consumption 2 i ss2 v out = v out(s) + 0.5 v s-835xx60 to 65 ? 5.7 11.3 a 1 current consumption during shutdown (with shutdown function) i sss off/on v = 0 v ? ? 0.5 a 1 s-835xx15 to 19 80 128 ? ma 1 s-835xx20 to 24 103 165 ? ma 1 s-835xx25 to 29 125 200 ? ma 1 s-835xx30 to 39 144 231 ? ma 1 s-835xx40 to 49 176 282 ? ma 1 s-835xx50 to 59 200 320 ? ma 1 switching current i sw v cont = 0.4 v s-835xx60 to 65 215 344 ? ma 1 switching transistor leakage current i swq v cont = v out = 10 v ? ? 0.5 a 1 line regulation v out1 v in = v out(s) 0.4 to 0.6 ? 30 60 mv 2 load regulation v out2 i out = 10 a to v out(s) / 250 1.25 ? 30 60 mv 2 output voltage temperature coefficient out out vta v ? ta = ? 40 c to + 85 c ? 50 ? ppm / c 2 oscillation frequency f osc v out = v out(s) 0.95 42.5 50 57.5 khz 1 maximum duty ratio maxduty v out = v out(s) 0.95 75 83 90 % 1 pwm / pfm switching duty ratio (for s-8354 series) pfmduty v in = v out(s) ? 0.1 v, no-load 10 15 24 % 1 v sh measured oscillation at cont pin 0.75 ? ? v 1 v sl1 at v out 1.5 v ? ? 0.3 v 1 off/on pin input voltage (with shutdown function) v sl2 judged oscillation stop at cont pin at v out < 1.5 v ? ? 0.2 v 1 i sh off/on v = v out(s) 0.95 ? 0.1 ? 0.1 a 1 off/on pin input current (with shutdown function) i sl off/on v = 0 v ? 0.1 ? 0.1 a 1 soft start time t ss ? 3.0 6.0 12.0 ms 2 efficiency effi ? ? 85 ? % 2
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator rev.3.0 _00 s-8353/8354 series seiko instruments inc. 11 external parts coil: cdrh6d28-101 of sumida corporation diode: ma2z748 (shottky type) of mats ushita electric industrial co., ltd. capacitor: f93 (16 v, 22 f tantalum type) of nichicon corporation v in = v out(s) 0.6 applied, i out = v out(s) / 250 with shutdown function : off/ on pin is connected to v out for v dd / v out separate type : vdd pin is connected to vout pin remark 1. v out(s) specified above is the set output voltage value, and v out is the typical value of the actual output voltage. 2. v dd / v out separate type a step-up operation is performed from v dd = 0.8 v. however, 1.8 v v dd 10 v ? is recommended stabilizing the output voltage and oscillation frequency. (v dd 1.8 v must be applied for products with a set value of less than 1.9 v.)
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator s-8353/8354 series rev.3.0 _00 seiko instruments inc. 12 (2) 30 khz product (c type) table 15 (ta = 25 c unless otherwise specified) item symbol condition min. typ. max. unit measurement circuit output voltage v out ? v out(s) 0.976 v out(s) v out(s) 1.024 v 2 input voltage v in ? ? ? 10 v 2 operation start voltage v st1 i out = 1 ma ? ? 0.9 v 2 oscillation start voltage v st2 no external parts, voltage applied to v out ? ? 0.8 v 1 operation holding voltage v hld i out = 1 ma, judged by decreasing v in voltage gradually 0.7 ? ? v 2 s-835xx20 to 29 ? 9.8 16.4 a 1 s-835xx30 to 39 ? 13.1 21.9 a 1 s-835xx40 to 49 ? 16.8 28.0 a 1 s-835xx50 to 59 ? 20.7 34.5 a 1 current consumption 1 i ss1 v out = v out(s) 0.95 s-835xx60 to 65 ? 24.8 41.4 a 1 s-835xx20 to 29 ? 435 9.0 a 1 s-835xx30 to 39 ? 4.7 9.4 a 1 s-835xx40 to 49 ? 4.9 9.7 a 1 s-835xx50 to 59 ? 5.1 10.1 a 1 current consumption 2 i ss2 v out = v out(s) + 0.5 v s-835xx60 to 65 ? 5.2 10.4 a 1 s-835xx20 to 24 52 83 ? ma 1 s-835xx25 to 29 62 100 ? ma 1 s-835xx30 to 39 72 115 ? ma 1 s-835xx40 to 49 88 141 ? ma 1 s-835xx50 to 59 100 160 ? ma 1 switching current i sw v cont = 0.4 v s-835xx60 to 65 108 172 ? ma 1 switching transistor leakage current i swq v cont = v out = 10 v ? ? 0.5 a 1 line regulation v out1 v in = v out(s) 0.4 to 0.6 ? 30 60 mv 2 load regulation v out2 i out = 10 a to v out(s) / 250 1.25 ? 30 60 mv 2 output voltage temperature coefficient out out vta v ? ta = ? 40 c to + 85 c ? 50 ? ppm / c 2 oscillation frequency f osc v out = v out(s) 0.95 25 30 35 khz 1 maximum duty ratio maxduty v out = v out(s) 0.95 75 83 90 % 1 pwm / pfm switching duty ratio (for s-8354 series) pfmduty v in = v out(s) ? 0.1 v, no-load 10 15 24 % 1 soft start time t ss ? 3.0 6.0 12.0 ms 2 efficiency effi ? ? 84 ? % 2 external parts coil: cdrh6d28-101 of sumida corporation diode: ma2z748 (shottky type) of mats ushita electric industrial co., ltd. capacitor: f93 (16 v, 22 f tantalum type) of nichicon corporation v in = v out(s) 0.6 applied, i out = v out(s) / 250 remark v out(s) specified above is the set output voltage value, and v out is the typical value of the actual output voltage.
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator rev.3.0 _00 s-8353/8354 series seiko instruments inc. 13 (3) 250 khz product (h and j types) table 16 (ta = 25 c unless otherwise specified) item symbol condition min. typ. max. unit measurement circuit output voltage v out ? v out(s) 0.976 v out(s) v out(s) 1.024 v 2 input voltage v in ? ? ? 10 v 2 operation start voltage v st1 i out = 1 ma ? ? 0.9 v 2 oscillation start voltage v st2 no external parts, voltage applied to v out ? ? 0.8 v 1 operation holding voltage v hld i out = 1 ma, judged by decreasing v in voltage gradually 0.7 ? ? v 2 s-835xx15 to 19 ? 36.5 60.8 a 1 s-835xx20 to 29 ? 48.3 80.5 a 1 s-835xx30 to 39 ? 74.3 123.8 a 1 s-835xx40 to 49 ? 103.1 171.9 a 1 s-835xx50 to 59 ? 134.1 223.5 a 1 current consumption 1 i ss1 v out = v out(s) 0.95 s-835xx60 to 65 ? 167.0 278.4 a 1 s-835xx15 to 19 ? 9.1 18.2 a 1 s-835xx20 to 29 ? 9.3 18.6 a 1 s-835xx30 to 39 ? 9.5 18.9 a 1 s-835xx40 to 49 ? 9.7 19.3 a 1 s-835xx50 to 59 ? 9.8 19.6 a 1 current consumption 2 i ss2 v out = v out(s) + 0.5 v s-835xx60 to 65 ? 10.0 19.9 a 1 current consumption during shutdown (with shutdown function) i sss off/on v = 0 v ? ? 0.5 a 1 s-835xx15 to 19 80 128 ? ma 1 s-835xx20 to 24 103 165 ? ma 1 s-835xx25 to 29 125 200 ? ma 1 s-835xx30 to 39 144 231 ? ma 1 s-835xx40 to 49 176 282 ? ma 1 s-835xx50 to 59 200 320 ? ma 1 switching current i sw v cont = 0.4 v s-835xx60 to 65 215 344 ? ma 1 switching transistor leakage current i swq v cont = v out = 10 v ? ? 0.5 a 1 line regulation v out1 v in = v out(s) 0.4 to 0.6 ? 30 60 mv 2 load regulation v out2 i out = 10 a to v out(s) / 250 1.25 ? 30 60 mv 2 output voltage temperature coefficient out out vta v ? ta = ? 40 c to + 85 c ? 50 ? ppm / c 2 oscillation frequency f osc v out = v out(s) 0.95 212.5 250 287.5 khz 1 maximum duty ratio maxduty v out = v out(s) 0.95 70 78 85 % 1 pwm / pfm switching duty ratio (for s-8354 series) pfmduty v in = v out(s) ? 0.1 v, no-load 10 15 24 % 1 v sh measured oscillation at cont pin 0.75 ? ? v 1 v sl1 at v out 1.5 v ? ? 0.3 v 1 off/on pin input voltage (with shutdown function) v sl2 judged oscillation stop at cont pin at v out < 1.5 v ? ? 0.2 v 1 i sh off/on v = v out(s) 0.95 ? 0.1 ? 0.1 a 1 off/on pin input current (with shutdown function) i sl off/on v = 0 v ? 0.1 ? 0.1 a 1 soft start time t ss ? 1.8 3.6 7.2 ms 2 efficiency effi ? ? 85 ? % 2
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator s-8353/8354 series rev.3.0 _00 seiko instruments inc. 14 external parts coil: cdrh6d28-220 of sumida corporation diode: ma2z748 (shottky type) of mats ushita electric industrial co., ltd. capacitor: f93 (16 v, 22 f tantalum type) of nichicon corporation v in = v out(s) 0.6 applied, i out = v out(s) / 250 with shutdown function : off/ on pin is connected to v out for v dd / v out separate type : vdd pin is connected to vout pin remark 1. v out(s) specified above is the set output voltage value, and v out is the typical value of the actual output voltage. 2. v dd / v out separate type a step-up operation is performed from v dd = 0.8 v. however, 1.8 v v dd 10 v ? is recommended stabilizing the output voltage and oscillation frequency. (v dd 1.8 v must be applied for products with a set value of less than 1.9 v.)
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator rev.3.0 _00 s-8353/8354 series seiko instruments inc. 15 ? measurement circuits 1. 300 a vss vout cont vdd *2 0.1 f + ? off/on *1 oscilloscope figure 8 2. v vss cont vout vdd *2 0.1 f + ? + ? off/on *1 figure 9 *1. with shutdown function *2. for v dd / v out separate type
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator s-8353/8354 series rev.3.0 _00 seiko instruments inc. 16 ? operation 1. switching control types 1. 1 pwm control (s-8353 series) the s-8353 series is a dc-dc converte r using a pulse width modulation method (pwm) and features low current consumption. in conventional pfm dc-dc converters, pulses are skipped w hen the output load current is low, causing a fluctuation in the ripple frequency of the output voltage, resulting in an increase in the ripple voltage. in the s-8353 series, the switching frequency does not change, although the pulse width changes from 0% to 83% (78% for h and j type) corresponding to each load cu rrent. the ripple voltage generated from switching can thus be removed easily using a filter because the switching frequency is constant. 1. 2 pwm / pfm switching control (s-8354 series) the s-8354 series is a dc-dc converter that automatic ally switches between a pulse width modulation method (pwm) and a pulse frequency modulation method (pfm), depending on the load current, and features low current consumption. the s-8354 series operates under pwm control with the pul se width duty changing from 15% to 83% (78% for h and j type) in a high output load current area. on t he other hand, the s-8354 series operates under pfm control with the pulse width duty fixed at 15% in a low output load current area, and pulses are skipped according to the load current. the oscillation circuit thus oscillates intermittently so that the resultant lower self current consumption can prevent a r eduction in the efficiency at a low load current. the switching point from pwm control to pfm control depends on the exte rnal devices (coil, diode, etc.), input voltage, and output voltage. this series are an especially efficient dc-dc converter at an output current around 100 a. 2. soft start function for this ic, a built-in soft start circuit controls the ru sh current and overshoot of the output voltage when the power is turned on or the off/ on pin is set to ?h? level.
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator rev.3.0 _00 s-8353/8354 series seiko instruments inc. 17 3. off/on pin (shutdown pin) (sot-23-5 package products of a and h types) off/ on pin stops or starts step-up operation. setting the off/ on pin to the ?l? level stops operation of all the internal circuits and reduces the current consumption significantly. do not use the off/ on pin in a floating state because it has the structure shown in figure 10 and is not pulled up or pulled down internally. do not apply a voltage of between 0.3 v and 0.75 v to the off/ on pin because applying such a voltage increases the current consumption. if the off/ on pin is not used, connect it to the vout pin. the off/ on pin does not have hysteresis. table 17 off/ on pin cr oscillation circuit output voltage ?h? operation fixed ?l? stop ? v in *1 *1. voltage obtained by subtracting the voltage drop due to the dc resistance of the inductor and the diode forward voltage from v in . vss vout off/on figure 10 off on/ pin structure
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator s-8353/8354 series rev.3.0 _00 seiko instruments inc. 18 4. operation the following are the basic equations [(1) through (7)] of the step-up switching regulator. (refer to figure 11 .) c l m1 d vout cont vin l + ext vss ? figure 11 step-up switching regulator circuit for basic equation voltage at cont pin at the moment m1 is turned on (v a ) *1 : v a = v s *2 (1) *1. current flowing through l (i l ) is zero. *2. non-saturated voltage of m1. the change in i l over time : l vv l v dt di sinll ? == (2) integration of equation (2) (i l ) : t l vv i sin l ? ? ? ? ? ? ? ? = (3) i l flows while m1 is on (t on ). the time of t on is determined by the os cillation frequency of osc. the peak current (i pk ) after t on : on sin pk t l vv i ? ? ? ? ? ? ? ? = (4) the energy stored in l is represented by 1/2 ? l (i pk ) 2 . when m1 is turned off (t off ), the energy stored in l is emitted th rough a diode to the output capacitor. then, the reverse voltage (v l ) is generated : v l = (v out + v d *1 ) ? v in (5) *1. diode forward voltage the voltage at cont pin rises only by v out + v d . the change in the current (i l ) flowing through the diode into v out during t off : l vvv l v dt di ind out ll ?+ == (6)
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator rev.3.0 _00 s-8353/8354 series seiko instruments inc. 19 integration of the equation (6) is as follows : t l vvv ii ind out pkl ? ? ? ? ? ? ? ?+ ?= (7) during t on , the energy is stored in l and is not transmitted to v out . when receiving the output current (i out ) from v out , the energy of the capacitor (c l ) is consumed. as a result, the pin voltage of c l is reduced, and goes to the lowest level after m1 is turned on (t on ). when m1 is turned off, the energy stored in l is transmitted through the diode to c l , and the voltage of c l rises rapidly. v out is a time function, and therefore indicates the maximum value (ripple voltage (v p ? p ) ) when the current flowing through into v out and load current (i out ) match. next, the ripple voltage is determined as follows. i out vs. t 1 (time) from when m1 is turned off (after t on ) to when v out reaches the maximum level : 1 ind out pk out t l vvv ii ? ? ? ? ? ? ? ?+ ?= (8) ? ? ? ? ? ? ? ? ?+ ??= ind out out pk1 vvv l )ii( t (9) when m1 is turned off (t off ), i l = 0 (when the energy of the inductor is completely transmitted). based on equation (7) : pk off ind out i t vvv l = ? ? ? ? ? ? ? ? ?+ (10) when substituting equation (10) for equation (9) : off pk out off1 t i i tt ? ? ? ? ? ? ? ? ? ?= (11) electric charge q 1 which is charged in c l during t 1 : 2 1 ind out 1pk 1t 0 ind out 1t 0 pk l 1t 0 1 t 2 1 l vvv titdt l vvv dtidtiq ? ?+ ??=? ?+ ??== ? (12) when substituting equation (12) for equation (9) : () 1 out pk 1out pk pk t 2 ii tii 2 1 i1q ? + =???= (13) a rise in voltage (v p ? p ) due to q 1 : 1 out pk ll 1 pp t 2 ii c 1 c q v ? ? ? ? ? ? ? + ?== ? (14) when taking into consideration i out to be consumed during t 1 and the equivalent series resistance (r esr ) of c l : l 1out esr out pk out pk ll 1 pp c ti r 2 ii 1t 2 ii c 1 c q v ? ?? ? ? ? ? ? ? + +? ? ? ? ? ? ? + ?= = ? (15) when substituting equation ( 11) for equation (15) : esr out pk l off pk 2 out pk pp r 2 ii c t i2 )ii( v ? ? ? ? ? ? ? + +? ? = ? (16) therefore to reduce the ripple voltage, it is important t hat the capacitor connected to the output pin has a large capacity and a small r esr .
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator s-8353/8354 series rev.3.0 _00 seiko instruments inc. 20 ? external parts selection the relationship between the major characteristics of the step- up circuit and the characteristic parameters of the external parts is shown in figure 12 . for higher efficiency ? for larger output current ? at pfm control at pwm control for smaller ripple voltage ? smaller inductance larger inductance smaller direct current resistance of inductor larger output capacitance larger output capacitance figure 12 relationship between major characteristics of step-up circuit and external parts 1. inductor the inductance value (l value) has a strong influence on the maximum output current (i out ) and efficiency ( ). the peak current (i pk ) increases by decreasing l value and the stability of the circ uit improves and i out increases. if l value is decreased, the efficiency falls causing a decline in the current drive c apacity for the switching transistor, and i out decreases. the loss of i pk by the switching transistor decreases by incr easing l and the efficiency becomes maximum at a certain l value. further increasing l value decreases the e fficiency due to the loss of the direct current resistance of the coil. i out also decreases. a higher oscillation frequency allows selection of a lower l value, making the coil smaller. the recommended inductances are a 47 h to 220 h for a, c, and d types, a 10 h to 47 h for h and j types. be careful of the allowable inductor current when choosi ng an inductor. exceeding the allowable current of the inductor causes magnetic saturation, much lower efficienc y and destruction of the ic chip due to a large current. choose an inductor so that i pk does not exceed the allowable current. i pk in discontinuous mode is calculated by the following equation: lf )vvv(i 2 i osc ind out out pk ? ?+ = (a) (17) f osc = oscillation frequency, v d ? 0.4 v. 2. diode use an external diode that meets the following requirements : ? low forward voltage : v f < 0.3 v ? high switching speed : 50 ns max. ? reverse voltage : v out + v f or more ? current rate : i pk or more
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator rev.3.0 _00 s-8353/8354 series seiko instruments inc. 21 3. capacitor (c in , c l ) a capacitor on the input side (c in ) improves the efficiency by reducing the power impedance and st abilizing the input current. select a c in value according to the impedance of the power supply used. a capacitor on the output side (c l ) is used for smoothing the output voltage. for step-up types, the output voltage flows intermittently to the load current, so step-up types need a larger capacitance than step-down types. therefore, select an appropriate capacitor in accordance with the ri pple voltage, which increases in case of a higher output voltage or a higher load current. the capacitor value should be 10 f or more. select an appropriate capacitor the equivalent series resistance (r esr ) for stable output voltage. the stable voltage range in this ic depends on the r esr . although the inductance value (l value) is also a factor, an r esr of 30 ? to 500 m maximizes the characteristics. however, the best r esr value may depend on the l value, the capacitance, the wiring, and the applications (output load). therefore, fully evaluate the r esr under the actual operating conditions to determine the best value. refer to the ? 1. example of ceramic capacitor application ? ( figure 16 ) in the ? ? application circuit ? for the circuit example using a ceramic capacitor and the external resistance of the capacitor (r esr ). 4. v dd / v out separate type (d and j types) the d and j types provides separate internal circuit power supply (vdd pin) and output voltage setting pin (vout pin) in the ic, making it ideal for the following applications. (1) when changing the output voltage with external resistance. (2) when outputting a high voltage within the operating voltage (10 v). choose the products in the table 18 according to the applications (1) or (2) above. table 18 output voltage (v cc ) 1.8 v v cc < 5 v 5 v v cc 10 v s-835xx18 yes ? s-835xx50 ? yes connection to vdd pin v in or v cc v in cautions 1. this ic starts a step-up operation at v dd = 0.8 v, but set 1.8 v dd 10 v to stabilize the output voltage and frequency of the oscillator. (input a voltage of 1.8 v or more at the vdd pin for all products with a setting less than 1.9 v.) an input voltage of 1.8 v or more at the vdd pin allows connection of the vdd pin to either the input voltage vin pin or output vout pin. 2. choose external resistors r a and r b so as to not affect the output voltage, considering that there is impedance between the vout pin and vss pin in the ic chip. the internal resistance between the vout pin and vss pin is as follows : (1) s-835xx18 : 2.1 m to 14.8 m (2) s-835xx20 : 1.4 m to 14.8 m (3) s-835xx30 : 1.4 m to 14.2 m (4) s-835xx50 : 1.4 m to 12.1 m 3. attach a capacitor (c c ) in parallel to the r a resistance when an unstable event such as oscillation of the output voltage occurs. calculate c c using the following equation : [] khz 20r2 1 c a c ??? = f
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator s-8353/8354 series rev.3.0 _00 seiko instruments inc. 22 ? standard circuits (1) s-8353axxma / ua, s-8353cxxma, s-8353hxxma/ua, s-8354axxma/ua, s-8354cxxma, s-8354hxxma / ua c l sd v in l vout vss pwm control circuit or pwm / pfm switching control circuit phase compensating circuit c in cont oscillation circuit soft start built-in reference power supply + ? + ? ic internal power supply + ? remark the power supply for the ic chip is from the vout pin. figure 13 (2) s-8353axxmc, s-8353hxxmc, s-8354axxmc, s-8354hxxmc pwm control circuit or pwm / pfm switching control circuit phase compensating circuit oscillation circuit sd v in l vout vss c in c l cont off/on soft start built-in reference power supply + ? ic internal power supply + ? + ? remark the power supply for the ic chip is from the vout pin. figure 14
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator rev.3.0 _00 s-8353/8354 series seiko instruments inc. 23 (3) s-8353dxxmc, s-8353jxxmc, s-8354dxxmc, s-8354jxxmc l sd v in c in vdd soft start built-in reference power supply phase compensating circuit oscillation circuit pwm control circuit or pwm / pfm switching control circuit cont vss r b r a c c vout c l + ? ic internal power supply + ? + ? remark the power supply for the ic chip is from the vout pin. figure 15 caution the above connection diagram will not guarantee successful operation. perform through evaluation using the actual application to set the constant.
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator s-8353/8354 series rev.3.0 _00 seiko instruments inc. 24 ? precautions ? mount external capacitors, diodes, and co ils as close as possible to the ic. especially, mounting the output capacitor (capacitor between vdd pin and vss pin for v dd / v out separate type) in the power supply line of the ic close to the ic can enable stable output characteristics. if it is impossible, it is recommended to mount and wire a ceramic capacitor of around 0.1 f close to the ic. ? characteristics ripple voltage and spike noise occur in ic containing switching regulators. moreover rush current flows at the time of a power supply injection. because these largely depend on the coil, the capacitor and impedance of power supply used, fully check them using an actually mounted model. ? make sure that the dissipation of the switching transis tor (especially at a high temperature) does not exceed the allowable power dissipation of the package. ? the performance of this ic varies depending on the design of the pcb patterns, peripheral circuits and external parts. thoroughly test all settings with your device. the recomm ended external part should be used wherever possible, but if this is not possible for some reason, contact an sii sales person. ? do not apply an electrostatic discharge to this ic that ex ceeds the performance ratings of the built-in electrostatic protection circuit. ? sii claims no responsibility for any and all disputes arising out of or in connection with any in fringement of the products including this ic upon patents owned a third party.
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator rev.3.0 _00 s-8353/8354 series seiko instruments inc. 25 ? application circuits 1. using ceramic capacitor example when using small r esr parts such as ceramic capacitors for the output capacitance, mount a resistor (r 1 ) corresponding to the r esr in series with the ceramic capacitor (c l ) as shown in figure 16 . r 1 differs depending on l value, the capacitance, the wiring, and the application (output load). the following example shows a circuit using r 1 = 100 m , output voltage = 3.3 v, output load = 100 ma and its characteristics. cont vout vss v out sd c l l r 1 v in c in figure 16 using ceramic capacitor circuit example table 19 ic l type name sd type name c l (ceramic capacitor) r 1 s-8353a33 cdrh5d28-101 ma2z748 10 f 2 100 m caution the above connection diag ram and constant will not guarantee successful operation. perform through evaluation using the actual application to set the constant.
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator s-8353/8354 series rev.3.0 _00 seiko instruments inc. 26 2. output characteristics of the us ing ceramic capacitor circuit example the data of the step-up characteristics (a) output current (i out ) vs. efficiency ( ) characteristics, (b) output current (i out ) vs. output voltage (v out ) characteristics, (c) output current (i out ) vs. ripple voltage (v r ) under conditions in table 19 is shown below. (a) output current (i out ) vs. efficiency ( ) (b) output current (i out ) vs. output voltage (v out ) v in = 1.8 v v in = 2.7 v v in = 0.9 v 0 20 40 60 80 100 0.01 0.1 1 10 100 1000 i out [ma] [%] 3.20 3.25 3.30 3.35 3.40 0.01 0.1 1 10 100 1000 i out [ma] v out [v] v in = 1.8 v v in = 2.7 v v in = 0.9 v (c) output current (i out ) vs. ripple voltage (v r ) 0 20 40 60 80 100 120 0.01 0.1 1 10 100 1000 v r [mv] i out [ma] 140 v in = 1.8 v v in = 2.7 v v in = 0.9 v
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator rev.3.0 _00 s-8353/8354 series seiko instruments inc. 27 ? characteristics (typical data) 1. example of major temperature characteristics (ta = ? 40 c to + 85 c, v out = 3.3 v) (1) current consumption 1 (i ss1 ) vs. temperature (ta) f osc = 50 khz f osc = 250 khz 0 10 20 30 40 50 ? 40 ? 20 0 20 40 60 80 100 ta [ c] i ss1 [ a] 0 10 20 30 40 50 i ss1 [ a] ? 40 ? 20 0 20 40 60 80 100 ta [ c] (2) current consumption 2 (i ss2 ) vs. temperature (ta) f osc = 50 khz f osc = 250 khz 0 2 4 6 8 10 ? 40 ? 20 0 20 40 60 80 100 ta [ c] i ss2 [ a] 0 2 4 6 8 10 ? 40 ? 20 0 20 40 60 80 100 ta [ c] i ss2 [ a] (3) current consumption at shutdown (i sss ) vs. temperature (ta) f osc = 250 khz 0 0.2 0.4 0.6 0.8 1.0 ? 40 ? 20 0 20 40 60 80 100 ta [ c] i sss [ a] (4) switching current (i sw ) vs. temperature (ta) (5) switching transistor leakage current (i swq ) vs. temperature (ta) f osc = 250 khz f osc = 250 khz ? 40 ? 20 0 20 40 60 80 100 ta [ c] i sw [ma] 100 200 300 400 500 0 0 0.2 0.4 0.6 0.8 1.0 ? 40 ? 20 0 20 40 60 80 100 ta [ c] i swq [ a]
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator s-8353/8354 series rev.3.0 _00 seiko instruments inc. 28 (6) oscillation frequency (f osc ) vs. temperature (ta) f osc = 50 khz f osc = 250 khz 30 40 50 60 70 ? 40 ? 20 0 20 40 60 80 100 ta [ c] f osc [khz] 150 200 250 300 350 ? 40 ? 20 0 20 40 60 80 100 f osc [khz] ta [ c] (7) maximum duty ratio (maxduty) vs. temperature (ta) f osc = 50 khz f osc = 250 khz ? 40 ? 20 0 20 40 60 80 100 ta [ c] maxduty [%] 50 60 70 80 90 100 ? 40 ? 20 0 20 40 60 80 100 ta [ c] maxduty [%] 50 60 70 80 90 100 (8) pwm / pfm switching duty ratio (pfmduty) vs. temperature (ta) (s-8354 series) (9) off/on pin input voltage ?h? (v sh ) vs. temperature (ta) f osc = 250 khz f osc = 250 khz 5 10 15 20 25 ? 40 ? 20 0 20 40 60 80 100 ta [ c] pfmduty [%] 0 0.2 0.4 0.6 0.8 1.0 ? 40 ? 20 0 20 40 60 80 100 ta [ c] v sh [v] (10) off/on pin input voltage ?l? 1 (v sl1 ) vs. temperature (ta) (s-8354 series) (11) off/on pin input voltage ?l? 2 (v sl2 ) vs. temperatuer (ta) f osc = 250 khz f osc = 250 khz 0 0.2 0.4 0.6 0.8 1.0 ? 40 ? 20 0 20 40 60 80 100 v sl1 [v] ta [ c] 0 0.2 0.4 0.6 0.8 1.0 ? 40 ? 20 0 20 40 60 80 100 ta [ c] v sl2 [v]
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator rev.3.0 _00 s-8353/8354 series seiko instruments inc. 29 (12) soft start time (t ss ) vs. temperature (ta) f osc = 50 khz f osc = 250 khz 0 2 4 6 8 ? 40 ? 20 0 20 40 60 80 100 ta [ c] t ss [ms] 0 2 4 6 8 ? 40 ? 20 0 20 40 60 80 100 t ss [ms] ta [ c ] (13) operation start voltage (v st1 ) vs. temperature (ta) (14) oscillation start voltage (v st2 ) vs. temperature (ta) f osc = 250 khz f osc = 250 khz 0 0.2 0.4 0.6 0.8 1.0 1.2 ? 40 ? 20 0 20 40 60 80 100 ta [ c] v st1 [v] 0 0.2 0.4 0.6 0.8 1.0 1.2 ? 40 ? 20 0 20 40 60 80 100 ta [ c] v st2 [v] (15) output voltage (v out ) vs. temperature (ta) f osc = 50 khz f osc = 250 khz 3.20 3.25 3.30 3.35 3.40 ? 40 ? 20 0 20 40 60 80 100 ta [ c ] v out [v] 3.20 3.25 3.30 3.35 3.40 ? 40 ? 20 0 20 40 60 80 100 ta [ c] v out [v]
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator s-8353/8354 series rev.3.0 _00 seiko instruments inc. 30 2. examples of major power supply dependence characteristics (ta = 25 c) (1) current consumption 1 (i ss1 ) vs. power supply voltage (v dd ), current consumption 2 (i ss2 ) vs. power supply voltage (v dd ) v out = 3.3 v, f osc = 50 khz v out = 3.3 v, f osc = 250 khz 0 10 20 30 40 50 0 2 4 6 8 10 v dd [v] i ss1 , i ss2 [ a] 0 20 40 60 80 100 0 2 4 6 8 10 v dd [v] i ss1 , i ss2 [ a] (2) oscillation frequency (f osc ) vs. power supply voltage (v dd ) f osc = 50 khz f osc = 250 khz 30 40 50 60 70 0 2 4 6 8 10 v dd [v] f osc [khz] 100 150 200 250 300 0246 8 10 v dd [v] f osc [khz] (3) switching current (i sw ) vs. power supply voltage (v dd ) 0 2 4 6 8 10 v dd [v] i sw [ma] 100 200 300 400 500 0 (4) output voltage (v out ) vs. power supply voltage (v dd ) (v out = 3.3 v, v in = 1.98 v, i out = 13.2 ma, v dd separate type) f osc = 50 khz f osc = 250 khz v dd [v] v out [v] 3.0 3.1 3.2 3.3 3.4 0 2 4 6 8 10 0246 8 10 v dd [v] v out [v] 3.0 3.1 3.2 3.3 3.4
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator rev.3.0 _00 s-8353/8354 series seiko instruments inc. 31 3. output waveforms (v in = 1.98 v) (1) s-8353a33 i out = 10 ma i out = 50 ma t [10 s / div] output voltage [0.01 v / div] cont voltage [1 v / div] t [10 s / div] output voltage [0.01 v / div] cont voltage [1 v / div] i out = 100 ma t [10 s / div] output voltage [ 0.02 v / div ] cont voltage [1 v / div] (2) s-8354h33 i out = 100 a i out = 10 ma t [2 s / div] output voltage [0.01 v / div] cont voltage [1 v / div] t [2 s / div] output voltage [0.01 v / div] cont voltage [1 v / div] i out = 50 ma i out = 100 ma t [2 s / div] output voltage [0.02 v / div] cont voltage [1 v / div] output voltage [0.02 v / div] cont voltage [1 v / div] t [2 s / div]
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator s-8353/8354 series rev.3.0 _00 seiko instruments inc. 32 4. examples of transient response characteristics (ta = 25 c, 250 khz, s-8354h33) (1) power-on (v in : 0 v 2.0 v) i out = 1 ma i out = 50 ma 0 2 t [1 ms / div] v in [v] 0 2 4 v out [v] 0 2 v in [v] 0 2 4 v out [ v ] t [1 ms / div] (2) off on/ pin response ( off/on v : 0 v 2.0 v, v in = 2 v) i out = 1 ma i out = 50 ma 0 2 t [1 ms / div] v on/off [v] 0 2 4 v out [v] 0 2 0 2 4 v out [v] v on/off [v] t [1 ms / div] (3) load fluctuations (v in = 1.98 v) 100 a 50 ma 50 ma 100 a v out [0.05 v / div] 100 a i out t [200 s / div] 50 ma v out [0.05 v / div] 100 a i out 50 ma t [5 ms / div] (4) input voltage fluctuations (i out = 50 ma) v in = 1.98 v 2.64 v v in = 2.64 v 1.98 v 1.98 2.64 v in [v] t [100 s / div] v out [0.02 v / div] v in [v] t [100 s / div] v out [0.04 v / div] 1.98 2.64
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator rev.3.0 _00 s-8353/8354 series seiko instruments inc. 33 ? reference data reference data is provided to determi ne specific external components. therefore, the following data shows the characteristics of the recommended external components selected for various applications. 1. external parts for reference data table 20 efficiency vs. output current characteristics a nd output voltage vs. output current characteristics for external parts condition product name oscillation frequency output voltage control system inductor diode output capacitor 1 s-8353h50mc 250 khz 5.0 v pwm cdrh8d28-220 f93 (16 v, 47 f) 2 s-8353h50mc 250 khz 5.0 v pwm cdrh5d28-220 f93 (6.3 v, 22 f) 3 s-8353h50mc 250 khz 5.0 v pwm cxlp120-220 f92 (6.3 v, 47 f) 4 s-8354a50mc 50 khz 5.0 v pwm / pfm cdrh8d28-101 f93 (6.3 v, 22 f) 5 s-8354a50mc 50 khz 5.0 v pwm / pfm cxlp120-470 f92 (6.3 v, 47 f) 6 s-8353a50mc 50 khz 5.0 v pwm cdrh8d28-101 f93 (6.3 v, 22 f) 7 s-8353a50mc 50 khz 5.0 v pwm cxlp120-470 f92 (6.3 v, 47 f) 8 s-8353a33mc 50 khz 3.3 v pwm cdrh8d28-101 ma2z748 f93 (6.3 v, 22 f) the properties of the external parts are shown below. table 21 properties of external parts component product name manufacturer characteristics cdrh8d28-220 22 h, dcr *1 = 95 m , i max. *2 = 1.6 a, component height = 3.0 mm cdrh8d28-101 100 h, dcr *1 = 410 m , i max. *2 = 0.75 a, component height = 3.0 mm cdrh5d28-220 sumida corporation 22 h, dcr *1 = 122 m , i max. *2 = 0.9 a, component height = 3.0 mm cxlp120-220 22 h, dcr *1 = 590 m , i max. *2 = 0.55 a, component height = 1.2 mm inductor cxlp120-470 sumitomo special metals co., ltd. 47 h, dcr *1 = 950 m , i max. *2 = 0.45 a, component height = 1.2 mm diode ma2z748 matsushita electric industrial co., ltd. v f *3 = 0.4 v, i f *4 = 0.3 a f93 (16 v, 47 f) f93 (6.3 v, 22 f) capacitor f92 (6.3 v, 47 f) nichicon corporation ? *1. direct current resistance *2. maximum allowable current *3. forward voltage *4. forward current caution the values shown in the characteristics column of table 21 above are based on the materials provided by each manufacture. however, consider the characteristi cs of the original materials when using the above products.
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator s-8353/8354 series rev.3.0 _00 seiko instruments inc. 34 2. output current (i out ) vs. efficiency ( ) characteristics, output current (i out ) vs. output voltage (v out ) characteristics the following shows the actual (a) output current (i out ) vs. efficiency ( ) characteristics and (b) output current (i out ) vs. output voltage (v out ) characteristics under the conditions of no. 1 to 8 in table 20 . condition 1 s-8353h50mc (a) output current (i out ) vs. efficiency ( ) (b) output current (i out ) vs. output voltage (v out ) 20 40 60 80 100 [%] i out [ ma ] 1 10 100 1000 0.1 0.01 v in = 3 v v in = 4 v v in = 2 v 4.7 4.8 4.9 5.0 5.1 5.2 i out [ma] v out [v] 1 10 100 1000 0.1 0.01 v in = 3 v v in = 4 v v in = 2 v condition 2 s-8353h50mc (a) output current (i out ) vs. efficiency ( ) (b) output current (i out ) vs. output voltage (v out ) 20 40 60 80 100 [%] i out [ma] 1 10 100 1000 0.1 0.01 v in = 3 v v in = 4 v v in = 2 v 4.7 4.8 4.9 5.0 5.1 5.2 i out [ ma ] v out [v] 1 10 100 1000 0.1 0.01 v in = 3 v v in = 4 v v in = 2 v condition 3 s-8353h50mc (a) output current (i out ) vs. efficiency ( ) (b) output current (i out ) vs. output voltage (v out ) 20 40 60 80 100 [%] i out [ ma ] 1 10 100 1000 0.1 0.01 v in = 3 v v in = 4 v v in = 2 v 4.7 4.8 4.9 5.0 5.1 5.2 i out [ ma ] v out [v] 1 10 100 1000 0.1 0.01 v in = 3 v v in = 4 v v in = 2 v condition 4 s-8354a50mc (a) output current (i out ) vs. efficiency ( ) (b) output current (i out ) vs. output voltage (v out ) 20 40 60 80 100 [%] i out [ma] 1 10 100 1000 0.1 0.01 v in = 3 v v in = 4 v v in = 2 v 4.7 4.8 4.9 5.0 5.1 5.2 i out [ ma ] v out [v] 1 10 100 1000 0.1 0.01 v in = 3 v v in = 4 v v in = 2 v
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator rev.3.0 _00 s-8353/8354 series seiko instruments inc. 35 condition 5 s-8354a50mc (a) output current (i out ) vs. efficiency ( ) (b) output current (i out ) vs. output voltage (v out ) 20 40 60 80 100 [%] i out [ ma ] 1 10 100 1000 0.1 0.01 v in = 3 v v in = 4 v v in = 2 v 4.7 4.8 4.9 5.0 5.1 5.2 i out [ ma ] v out [v] 1 10 100 1000 0.1 0.01 v in = 3 v v in = 4 v v in = 2 v condition 6 s-8353a50mc (a) output current (i out ) vs. efficiency ( ) (b) output current (i out ) vs. output voltage (v out ) 20 40 60 80 100 [%] i out [ma] 1 10 100 1000 0.1 0.01 v in = 3 v v in = 4 v v in = 2 v 4.7 4.8 4.9 5.0 5.1 5.2 i out [ ma ] v out [v] 1 10 100 1000 0.1 0.01 v in = 3 v v in = 4 v v in = 2 v condition 7 s-8353a50mc (a) output current (i out ) vs. efficiency ( ) (b) output current (i out ) vs. output voltage (v out ) 20 40 60 80 100 [%] i out [ma] 1 10 100 1000 0.1 0.01 v in = 3 v v in = 4 v v in = 2 v 4.7 4.8 4.9 5.0 5.1 5.2 i out [ ma ] v out [v] 1 10 100 1000 0.1 0.01 v in = 3 v v in = 4 v v in = 2 v condition 8 s-8353a33mc (a) output current (i out ) vs. efficiency ( ) (b) output current (i out ) vs. output voltage (v out ) 20 40 60 80 100 [%] i out [ ma ] 1 10 100 1000 0.1 0.01 v in = 1.8 v v in = 2.7 v v in = 0.9 v 3.0 3.1 3.2 3.3 3.4 3.5 i out [ma] v out [v] 1 10 100 1000 0.1 0.01 v in = 1.8 v v in = 2.7 v v in = 0.9 v
step-up, pwm control or pwm / pfm switchable built-in transistor switching regulator s-8353/8354 series rev.3.0 _00 seiko instruments inc. 36 3. output current (i out ) vs. ripple voltage (v r ) characteristics the following shows the actual output current (i out ) vs. ripple voltage (v r ) characteristics and (b) output current (i out ) vs. output voltage (v out ) characteristics under the conditions of no. 1 to 8 in table 20 . condition 1 s-8353h50mc condition 2 s-8353h50mc v r [mv] i out [ma] 1 10 100 1000 0.1 0.01 20 40 60 80 100 0 v in = 3 v v in = 4 v v in = 2 v i out [ma] v r [mv] 1 10 100 1000 0.1 0.01 20 40 60 80 100 0 v in = 3 v v in = 4 v v in = 2 v condition 3 s-8353h50mc condition 4 s-8354a50mc v r [mv] i out [ma] 1 10 100 1000 0.1 0.01 40 80 120 160 200 0 v in = 3 v v in = 4 v v in = 2 v i out [ ma ] v r [mv] 1 10 100 1000 0.1 0.01 40 80 120 160 200 0 v in = 3 v v in = 4 v v in = 2 v condition 5 s-8354a50mc condition 6 s-8353a50mc 40 80 120 160 200 0 240 280 i out [ ma ] 1 10 100 1000 0.1 0.01 v r [mv] v in = 3 v v in = 4 v v in = 2 v i out [ma] v r [mv] 1 10 100 1000 0.1 0.01 40 80 120 160 200 0 v in = 3 v v in = 4 v v in = 2 v condition 7 s-8353a50mc condition 8 s-8353a33mc 40 80 120 160 200 0 240 280 i out [ ma ] 1 10 100 1000 0.1 0.01 v r [mv] v in = 3 v v in = 4 v v in = 2 v i out [ma] v r [mv] 1 10 100 1000 0.1 0.01 40 80 120 160 200 0 v in = 3 v v in = 4 v v in = 2 v

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www.sii-ic.com ? the information described herein is subject to change without notice. ? seiko instruments inc. is not responsible for any pr oblems caused by circuits or diagrams described herein whose related industrial properties, patents, or ot her rights belong to third parties. the application circuit examples explain typical applications of the products, and do not guarant ee the success of any specific mass-production design. ? when the products described herein are regulated produ cts subject to the wassenaar arrangement or other agreements, they may not be exported without authoriz ation from the appropriate governmental authority. ? use of the information described he rein for other purposes and/or repr oduction or copying without the express permission of seiko instrum ents inc. is strictly prohibited. ? the products described herein cannot be used as par t of any device or equipment affecting the human body, such as exercise equipment, medical equipment, security systems, gas equipment, or any apparatus installed in airplanes and other vehicles, without prior written permission of seiko instruments inc. ? although seiko instruments inc. exerts the greatest possible effort to ensure high quality and reliability, the failure or malfunction of semiconductor products may oc cur. the user of these products should therefore give thorough consideration to safety design, including redundancy, fire-prevention measures, and malfunction prevention, to prevent any accidents, fires, or community damage that may ensue.

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