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rp400xxx1c series high efficiency, small package s, step-up dc/d c converters no.ea-193-100806 1 outline rp400xxx1c series are high efficiency, step-up dc/dc co nverter ics packaged in compact 5pin sot23 or 6pin dfn(plp). this converter starts up of low voltage (t yp.1.2v) operation from one to two alkaline or a nickel-metal-hydride (nimh) or one-cell lithium-ion (li+) battery. this ic consists of a reference voltage unit with soft start, a chip enable circuit, an error amplifier, phase compensation circuits, a slope circuit, a pwm control ci rcuit, a start-up circuit, a pwm/vfm mode control circuit, internal switches and a protection circuit. as a protection circuit, rp400xxx1c has a current limit circuit which limits the peak current of the i nductor at each clock cycle. a low ripple high efficiency step up dc/dc converter c an be composed of rp400xxx1c series with only an inductor, a diode and capacitors. this converter is based on a fixed frequency current mode pwm control which goes to power save mode (vfm mode) at light load automatically. rp400xxx1c series has built-in anti-ringing switch to prevent switching node from ringing, when th e converter enters the discontinuous current mode. the output voltage of rp400k001c can be set within 1.8~5.0v (recommended range of output voltage) by external divider resistors. features low start-up voltage guaranteed 1.2v input voltage rang e 1.2v~5.5v high efficiency 85% (100ma/3.3v v in =1.5v 25c) output curren t 200ma/3.3v(v in =1.5v) typ. 100ma/2.0v(v in =1.2v) internal swit ch nmos=0.4 ? (v out =3.3v, 25c) built-in phase compensation, soft start, peak current limit protection pwm oscillator fr equency 700khz output voltage range fixed: 1.8v to 5.0v with 0.1v stepwise adjustable: 1.8v~5.0v (rp400k001c only) (recommended range of output voltage) stable with ceramic capacitors small package dfn(plp)1820- 6, sot23-5 internal emi suppression (anti-ringing switch is included) applications mp3 players, pda digital still cameras lcd bias supplies portable blood pressure meter wireless handset gps
rp400xxx1c series 2 block diagrams 1. adjustable output with ce function rp400k001c 2. fixed output with ce function rp400xxx1c ce lx gnd v out vref - + v in startup circuit pfm chip enable pw m control control logic buffer current sense erroramp power save mode operation control sleep fosc ce lx gnd v fb vref - + v in startup circuit pfm chip enable pw m control control logic buffer current sense erroram p power save mode o p eration control sleep fosc v out
rp400xxx1c series 3 selection guide in the rp400 series, output voltage, type of output volt age, and package for the ics can be selected at the user?s request. product name package quantity per reel pb free halogen free rp400kxx1c-tr dfn (plp)1820-6 5,000 pcs yes yes rp400nxx1c-tr-fe sot-23-5 3,000 pcs yes yes xx : designation of output voltage 00: adjustable version (1.8v ~ 5.0v) * recommended range of output voltage / dfn(plp)1820-6 only fixed version is possible in the ran ge from 1.8v to 5.0v with a step of 0.1v
rp400xxx1c series 4 pin configuration dfn(plp)1820-6 sot-23-5 pin description rp400k001c: dfn(plp)1820-6 pin no symbol pin description 1 v in power supply pin 2 ce chip enable pin (active with ?h?) 3 gnd ground pin 4 lx internal nmos switch drain pin 5 v fb feedback input pin for setting output voltage 6 v out output pin * tab is gnd level. (they are connected to the reverse side of this ic.) the tab is better to be connected to the gnd, but leaving it open is also acceptable. rp400kxx1c: dfn(plp)1820-6 pin no symbol pin description 1 v in power supply pin 2 ce chip enable pin (active with ?h?) 3 gnd ground pin 4 lx internal nmos switch drain pin 5 nc no connection 6 v out output pin * tab is gnd level. (they are connected to the reverse side of this ic.) the tab is better to be connected to the gnd, but leaving it open is also acceptable. rp400nxx1c: sot-23-5 pin no symbol pin description 1 ce chip enable pin (active with ?h?) 2 gnd ground pin 3 v in power supply pin 4 v out output pin 5 lx internal nmos switch drain pin 1 3 (top view) 54 2 1 3 (bottom view) 2 6 5 4
rp400xxx1c series 5 absolute maximam ratings (gnd=0v) symbol items ratings unit v in v in supply voltage -0.3 ~ 6.0 v v out v out pin voltage -0.3 ~ 6.0 v v fb v fb pin voltage -0.3 ~ 6.0 v v lx pin input voltage -0.3 ~ 6.0 v v ce ce pin voltage rp400k001a -0.3 ~ 6.0 v i lx lx pin output current 0.8 a sot-23-5 420 p d power dissipation dfn(plp)1820-6 880 mw ta operating temp range -40 ~ + 85 c tstg storage temp range -55 ~ + 125 c * ) for power dissipation, please refer to package information to be described. absolute maximum ratings electronic and mechanical stress momentarily exceeded abs olute maximum ratings may cause the permanent damages and may degrade the life time and safety for both device and system using the device in the field. the functional operation at or over these absolute maximum ratings is not assured. recommended operating conditions (electrical characteristics) all of electronic equipment should be designed that the mounted semico nductor devices operate within the recommended operating conditions. the semiconductor devices cannot operate normally over the recommended operating conditions, even if when they are used over such conditi ons by momentary electronic noise or surge. and the semiconductor devices may receive serious damage when th ey continue to operate over the recommended operating conditions.
rp400xxx1c series 6 electrical characteristics (ta=25 c) symbol item conditions min. typ. max . unit v in input voltage 5.5 v vstart 2 start-up voltage 2 load current = 1ma v ce =1.5v 1.2 1.5 v vstart 3 start-up voltage 3 load current = 1ma ce v out ??Ar 1.2 1.5 v vhold 1 hold-on voltage 1 (once started) load current = 1ma 0.7 v adjustable version v in =3v v out =5v v fb =0v 500 800 a i dd1 quiescent current 1 fixed version v in =0.5 v out v out = 0.95 v out v out 100 (*3) a adjustable version v in =v out =5v v fb =1.0v 160 300 a i dd2 quiescent current 2 (no switching) fixed version v in =v out =5v 160 300 a istandby standby current v in =v out =5v,v ce =0v 0.15 3 a v fb feedback voltage (adjustable version) v in =v out =3.3v 0.588 0.600 0.612 v v out output-voltage (fixed version) v in = v ce =1.5v 0.98 1.02 v ? v out / ? ta output-voltage temperature coefficient -40c ta 85c 100 ppm/ c adjustable version v in =v out =3.3v 595 700 805 khz fosc switching frequency fixed version v in =v out =0.95 v out 595 700 805 khz ? fosc / ? ta switching frequency temperature coefficient -40c ta 85c 0.2 khz /c r onn nmos on-resistance (*1) v out =3.3v 0.4 ? i ceh ce ?h? input current v in =v out =v ce =5v 0.5 a i cel ce ?l? input current v in =v out =5v v ce =0v -0.5 a i fbh fb ?h? input current (adjustable version) v in =v out =v fb =5v 0.5 a i xfbl fb ?l? input current (adjustable version) v in =v out =5v v fb =0v -0.5 a i lx lx leak current v in =v out =v lx =5v v ce =0v 5 a adjustable version v out =3.3v detective at duty=maxduty-5% 0.4 0.6 a i lxpeak lx leak current limit (*2) fixed version v out = 0.95 v out detective at duty=maxduty-5% 0.4 0.6 a
rp400xxx1c series 7 electrical characteristics (cont.) (ta=25 c) symbol item conditions min. typ. max. unit adjustable version v out =3.3v 0.9 v v ceh ce input ?h? level voltage fixed version v in =v out =0.95 v out 0.9 v ce input ?l? level voltage adjustable version v in =v out =3.3v 0.4 v v cel ce input ?l? level voltage fixed version v in =v out = 0.95 v out 0.4 v max duty adjustable version v in =v out =3.3v, v fb =0v 80 88 95 % maxduty max duty fixed version v in =v out =0.95 v out 80 88 95 % soft start period adjustable version v in =1.65v v out =3.3v v ce =0v to 1.5v v out =2.97v 0.08 0.7 3.0 ms tstart soft start period fixed version v in =v out 0.5 (min:1.2v) v ce =0v to 1.5v v out =v out 0.9 0.08 0.7 3.0 ms anti-ringing switch on resistance adjustable version v in =v out =3.3v 110 ? r ona anti-ringing switch on resistance fixed version v in =v out =1.05 v out 110 ? *1) guaranteed by design engineering. nmos on-resistance according to the v out voltage. *2) lx limit current changes by duty. *3) the maximum value of operating current 1( fixed version) is shown on the table below. v out (v) max ( a) v out (v) max ( a) 1.8 v 290 3.5 v 560 1.9 v 310 3.6 v 580 2.0 v 320 3.7 v 600 2.1 v 340 3.8 v 610 2.2 v 360 3.9 v 630 2.3 v 370 4.0 v 640 2.4 v 390 4.1 v 660 2.5 v 400 4.2 v 680 2.6 v 420 4.3 v 690 2.7 v 440 4.4 v 710 2.8 v 450 4.5 v 720 2.9 v 470 4.6 v 740 3.0 v 480 4.7 v 760 3.1 v 500 4.8 v 770 3.2 v 520 4.9 v 790 3.3 v 530 5.0 v 800 3.4 v 550
rp400xxx1c series 8 application notes adjastable output voltage type (version:c) fixed output voltage type (version:c) external components capacitor :c2012jb1c106m (tdk) diode :crs02 (toshiba) inductor :tdk slf7045t-100m1r3-pf(tdk) lx v in ce gnd v out v fb ?h? active rp400k001c c in 10 f c out 10 f l 10 h(6.8 h) schottky diode r1 r2 v out 1.8v to 5v lx v in ce gnd v out ?h? active rp400xxx1c c in 10 f c out 10 f l 10 h(6.8 h) schottky diode v out 1.8v to 5v
rp400xxx1c series 9 setting of output voltage output voltage(1.8v to 5.0v recommended range of voltage) can be set with divider resistors for voltage setting, r1 and r2 as shown in the typical application. refer to the next formula. output voltage v fb (r1+r2)/ r1 (v fb =0.6v) recommended value of resistors(r1+r2) is lower than 100k ? . make sufficient power supply and ground and reinforce supplying. the large switching current could flow through the connection of power supply, inductor, ground, diode and the connection of v out . if the impedance of the connection of power supply and ground is high, the voltage level of power supply of the ic fluctuates with the switching current. we recommend you to use output capacitor and diode with an allowable voltage at least 1.5 times as much as setting output voltage. this is because there may be case where a spike-shaped high voltage is generated by an inductor when built-in transistor is on and off. use a diode of a schottky type with high switching s peed, low reverse current and also pay attention to its current capacity. set external components as close as possible to the ic and minimize the connection between the components and the ic. in particular, output capacitor should be connected to v out pin with ic ground by the minimum connection, because this ic uses the v out voltage as the main power supply, after start-up. use capacitors with a capacity of 10 f or more for v out pin. we recommend you to set a ceramic capacitor (10 f) between v in and ground. the divider resistors should be placed as close as possible to the ic ground pin. v fb line is recommended to use short line as well to avoid the influence of noise. please select the inductor value 10 h in the case of v out R 2.5v and 6.8 h in the case of v out <2.5v. choose an inductor that has sufficiently small d.c. re sistance and large allowable current and is hard to reach magnetic saturation. and if the value of i nductance of an inductor is extremely small, the i lx may exceed the absolute maximum rating at the maximum l oading. use an inductor with appropriate inductance. (refer to next output current of step-up circuit and external components) * the performance of power circuit using those ics ex tremely depends upon the peripheral circuits. pay attention in the selection of the peripheral circuits. in particular, design the peripheral circuits in a way that the values such as voltage, current, and power of each component, pcb patterns and the ic do not exceed their respected rated values. (such as the voltage, current , and power)
rp400xxx1c series 10 output current of step-up ci rcuit and external components inductor diode cl lx tr v in v out i out ilxmax ilxmin ton toff t=1/fosc tf il discontinuous t ilxmax ilxmin ton toff t=1/fosc t il iconst continuous there are two modes, or discontinuous mode and continuous mode for the pwm step-up switching regulator depending on the continuous characteristic of inductor current. during on time of the transistor, when the voltage added on to the inductor is described as v in , the current is v in t/l. therefore, the electric power, p on , which is supplied with input side, can be described as in next formula. dt t/l v p ton 0 in 2 on = formula 1 with the step-up circuit, electric power is supplied fr om power source also during off time. in this case, input current is described as(v out ? v in ) t/l, therefore electric power, p off is described as in next formula. dt )t/l v (v v p in out tf 0 in off ? = formula 2 in this formula, tf means the time of which the ene rgy saved in the inductance is being emitted. thus average electric power, p av is described as in the next formula. dt} )t/l v (v v dt t/l v { toff) 1/(ton p in out tf 0 in ton 0 2 in av ? + + = formula 3
rp400xxx1c series 11 in pwm control, when tf=toff is true, the inductor current becomes continuous, then the operation of switching regulator becomes continuous mode. in the cont inuous mode, the deviation of the current is equal between on time and off time. v in ton/ l (v out v in ) toff/l formula 4 further, the electric power, pav is equal to output electric power, v out i out , thus, i out = fosc v in ton 2 / 2 l (v out v in ) = v in ton/(2 l v out ) formula 5 when i out becomes more than v in ton toff/(2 l (ton toff)),the current flows through the inductor, then the mode becomes continuous. the contin uous current through the inductor is described as lconst, then, i out = fosc v in 2 ton 2 / (2 l (v out v in ) ) + v in iconst / v out formula 6 in this moment, the peak current, ilxmax flowing thr ough the inductor and the driver tr. is described as follows: ilxmax = iconst + v in ton / l formula 7 with the formula 4 , 6 and ilxmax is ilxmax = v out /v in i out +v in ton/(2 l) fo rmula 8 however, ton=(1-v in /v out )/fosc therefore, peak current is more than i out . considering the value of ilxmax, the condition of input and output, and external components should be selected. in the formula 7, peak current ilxmax at discontinuous mode can be calculated. put lconst 0 in the formula. the explanation above is based on the ideal calculat ion, and the loss caused by lx switch and external components is not included. please select the i nductor and the diode with current peak to the standard(formula 8).
rp400xxx1c series 12 1) output voltage vs. output current 2) efficiency vs. output curren t rp400k001c rp400k001c rp400x181c rp400x181c rp400k001c rp400k001c rp400x331c rp400x331c rp400k001c rp400k001c rp400x501c rp400x501c typical chalacteristi c 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 1000 i out [ma] [%] se tv out =5.0 v vin:1.5v vin:1.2v v in:1.2v vin:1.5v vin:2 .0v vin:3 .0v vin:4.0v 1.6 1.65 1.7 1.75 1.8 1.85 1.9 1.95 2 0 100 200 300 400 500 600 700 800 i out [ma] v out [v] vin:1.2 vin:1.5 setv out =1.8v 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 0 100 200 300 400 500 600 700 800 i out [ma] v out [v] vin:1.2 vin:1.5 vin:2.0 vin:3.0 vin:4.0 setv out =5.0v 3 3.05 3.1 3.15 3.2 3.25 3.3 3.35 3.4 3.45 3.5 3.55 3.6 0 100 200 300 400 500 600 700 800 i out [ma] v out [v] setv out =3.3v vin:1.2 vin:1.5 vin:2.0 vin:1.2v vin:1.5v 0 10 20 30 40 50 60 70 80 90 0.1 1 10 100 1000 i out [ma] [%] setv out =1.8v vin:1.2 vin:1.5 0 10 20 30 40 50 60 70 80 90 100 0. 1 1 10 100 1000 i ou t [ma] [%] setv out =3.3v vin:2.0v vin:1.5 vin:1.2v
rp400xxx1c series 13 3) quiescent current 1 vs.temperature 4) quiescent current 2 vs.temperature 5) maxduty vs. temperature 6) start-up voltage 2 vs. temperature 7) start-up voltage 3 vs.temperature 8) soft-start period vs. temperature rp400k001c rp400k001c rp400xxx1c rp400x331c rp400xxx1c rp400k001c rp400k001c rp400xxx1c rp400k001c rp400k001c rp400x501c rp400x501c 300 400 500 600 700 800 -50 -25 0 25 50 75 100 ta [ c] idd1 [a] 100 150 200 250 300 -50-250 255075100 ta [c] idd2 [a] 80 82 84 86 88 90 92 94 96 98 100 -50 -25 0 25 50 75 100 ta [ c] maxdty [%] setv out =5.0v s etv out =5.0v 0. 4 0. 5 0. 6 0. 7 0. 8 0. 9 1. 0 1. 1 1. 2 1. 3 -50-250 255075100 ta[c] v in [v] 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 -50-25 0 255075100 ta [c] v in [v] -0.5 -0.3 -0.1 0.1 0.3 0.5 0.7 0.9 1.1 -50 -25 0 25 50 75 100 ta [ c] tstart [ms] stv 33v
rp400xxx1c series 14 9) switching frequency vs. temperature 10) lx peak current limit vs. duty 11) ce input voltage vs. temperat ure 12) feedback voltage vs. temperat ure 13) start-up waveform 14) load response rp400k001c rp400k001c rp400k001c rp400k001c rp400k001c rp400x001c rp400xxx1c rp400xxx1c rp400xxx1c rp400x331c rp400x331c 650 660 670 680 690 700 710 720 730 740 750 -50 -25 0 25 50 75 100 ta [ c] fosc1 [khz] 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 -50-250 255075100 ta [c] vceh [v] 0.590 0.595 0.600 0.605 0.610 0.615 0.620 -50 -25 0 25 50 75 100 ta [ c] vfb [v] set-v out = 3.3v v in = 1.5v load = 1ma ta = 25c 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 0.00.51.01.52.02.53.0 time [ms] voltage [v] 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 input current [a] input current e nable volt age output voltage v out = 3.3v v in = 1.5 v ta = 2 5c 3.00 3.05 3.10 3.15 3.20 3.25 3.30 3.35 3.40 3.45 3.50 0.0 1.0 2.0 3.0 4.0 time [ms] output voltage [v] -100 0 100 output current[ma] output voltage output current 10ma~100ma 400 500 600 700 800 900 1000 40%50%60%70%80%90%100% duty [%] ilxpeak [ma]
rp400xxx1c series 15 15) output voltage waveform 16) hold-on voltage 1 rp400xxx1c rp400k001c rp400k001c rp400k001c rp400x331c rp400x331c set-v out = 3.3v, v in = 1.5v load = 100ma ta = 25c -0.0801 -0.0601 -0.0401 -0.0201 -0.0001 0.0199 -8.e-07 2.e-07 1.e-06 2.e-06 3.e-06 time[sec ] output ripple[v] -2 0 2 4 6 8 10 lx waveform(v) set-v out = 3.3v, v in = 1.5 v, load = 1ma ta = 25c -0.5 -0.45 -0.4 -0.35 -0.3 -0.25 -0.2 -0.15 -0.1 -0.05 0 0.05 0.1 0.e+00 2.e-04 4.e-04 6.e-04 8.e-04 time[s ec ] output ripple[v] -1 1 3 5 7 9 lx waveform(v) 0.15 0.25 0.35 0.45 0.55 0.65 0.75 -40 -15 10 35 60 85 ta [ c] v in [v] set-v out =5.0v set-v out =3.3v set -v out =1 . 8 v 0.2 0 -0.2 -0.4 -0.6
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