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february 2012 doc id 14314 rev 5 1/20 20 st1s12xx st1s12xx12, st1s12xx18 synchronous rectification with enable, 0.7 a, 1.7 mhz fixed or adjustable step-down switching regulator in tsot23-5l features step-down current mode pwm (1.7 mhz) dc- dc converter 3% dc output voltage tolerance synchronous rectification fixed output voltage 1.2 v, 1.8 v, and adj (available on request 1.5 v, 2.5 v and 3.3 v) enable function internal soft start typical efficiency: > 90% 0.7 a output current capability not switching quiescent current: max 650 a over temperature range r dson typ. 250 m and 400 m uses tiny capacitors and inductors operative junction temp. -40 c to 125 c available in tsot23-5l package description the st1s12 is a step down dc-dc converter optimized for powering low-voltage digital cores in hdd applications and, generally, to replace the high current linear solution when the power dissipation may cause high heating of the application environment. it provides up to 0.7 a over an input voltage range of 2.5 v to 5.5 v. a high switching frequency (1.7 mhz) allows the use of tiny surface-mount components. in addition to the resistor divider to set the output voltage value, only an inductor and two capacitors are required. moreover, a low output ripple is guaranteed by the current mode pwm topology and by the use of low esr smd ceramic capacitors. the device is thermally protected and the current is limited to prevent damage due to accidental short-circuit. the st1s12 is available in the tsot23-5l package. tsot23-5l table 1. device summary part numbers order codes package st1s12xx st1s12gr tsot23-5l st1s12xx12 st1s12g12r tsot23-5l st1s12xx18 st1s12g18r tsot23-5l www.st.com
contents st1s12xx, st1s12xx12, st1s12xx18 2/20 doc id 14314 rev 5 contents 1 schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6 application notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7 typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 8 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 9 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
st1s12xx, st1s12xx12, st1s12xx18 schematic doc id 14314 rev 5 3/20 1 schematic figure 1. schematic diagram
pin configuration st1s12xx, st1s12xx12, st1s12xx18 4/20 doc id 14314 rev 5 2 pin configuration figure 2. pin connections (top view) table 2. pin description pin n symbol name and function 1 en enable pin 2 gnd system ground 3 sw switching pin 4v in input supply pin 5fb/v o feedback voltage / or output voltage
st1s12xx, st1s12xx12, st1s12xx18 maximum ratings doc id 14314 rev 5 5/20 3 maximum ratings note: absolute maximum ratings are the values beyond which damage to the device may occur. functional operation under these conditions is not implied. table 3. absolute maximum ratings symbol parameter value unit v in positive power supply voltage -0.3 to 6.5 v v en enable voltage -0.3 to v in + 0.3 v switch voltage max. voltage of output pin -0.3 to v in + 0.3 v v fb /v o feedback voltage -0.3 to 3 v v o output voltage (for v o > 1.6 v) -0.3 to 6 v t j max junction temperature -40 to 150 c t stg storage temperature range -65 to 150 c t lead lead temperature (soldering) 10 sec 260 c table 4. thermal data symbol parameter value unit r thja thermal resistance junction-ambient 220 c/w r thjc thermal resistance junction-case 110 c/w table 5. esd performance symbol parameter test conditions value unit esd esd protection voltage hbm 2 kv mm 0.3 kv
electrical characteristics st1s12xx, st1s12xx12, st1s12xx18 6/20 doc id 14314 rev 5 4 electrical characteristics v in = v en = 3.6 v, c in = 4.7 f, c o = 10 f, l = 2.2 h, t j = - 40 to 125 c (unless otherwise specified. typical values are referred to 25 c). table 6. electrical characteristics for st1s12g symbol parameter test conditions min. typ. max. unit fb feedback voltage t j = -40 to 125c 582 600 618 mv i fb v fb pin bias current -50 50 na v in minimum input voltage i o = 10ma to 0.7a 2.5 v i q quiescent current v in = v en, v fb = 0.65v 500 650 a v en = 0, t j = -40c to 85c 1 a i o output current v in = 2.5v to 5.5 v (1) 0.7 a v en enable threshold device on, v in = 2.5v to 5.5v 1.5 v device off 0.5 i en enable pin current 1 a %v o / v in reference line regulation v in = 2.5v to 5.5v (1) 0.05 0.1 %v o / v in %v o / i o reference load regulation i o = 10 ma to 700ma (1) 0.0025 0.005 %v o /ma pwmf s pwm switching frequency 1.16 1.7 2.08 mhz d max maximum duty cycle 100 % r dson -n nmos switch on resistance i sw = 100ma 0.25 0.4 r dson -p pmos switch on resistance i sw = 100ma 0.25 0.45 i swl switching current limitation (1) 1.6 a efficiency (1) i o = 10ma to 100 ma, v o = 1.8v 80 % i o = 100ma to 0.7a, v o = 1.8v 90 t shdn thermal shutdown 130 150 c t hys thermal shutdown hysteresis 15 c %v o / i o load transient response i o = 100ma to 700ma, t a = 25c t r = t f 200ns, c o =22f (1) -5 +5 %v o %v o / i o short circuit removal response i o = 10ma to i o = short, t a = 25c (1) -10 +10 %v o 1. guaranteed by design, but not tested in production.
st1s12xx, st1s12xx12, st1s12xx18 electrical characteristics doc id 14314 rev 5 7/20 v in =v en = 3 v, c in = 4.7 f, c o =10 f, l = 2.2 h, t j = -40 to 125 c (unless otherwise specified. typical values are referred to 25 c). table 7. electrical characteristics for st1s12g12 symbol parameter test conditions min. typ. max. unit out output feedback pin t j =-40 to 125c 1.164 1.2 1.236 v i o v o pin bias current 15 20 a v in minimum input voltage i o = 10ma to 0.7a 2.5 v i q quiescent current v in =v en, v fb =1.5v 500 650 a v en = 0, t = -40c to 85c 1 a i o output current v in = 2.5v to 5.5v (1) 0.7 a v en enable threshold device on, v in = 2.5 to 5.5v 1.5 v device off 0.5 i en enable pin current 1 a %v o / v in reference line regulation v in = 2.5v to 5.5v (1) 0.05 0.1 %v o / v in %v o / i o reference load regulation i o = 10ma to 700ma (1) 0.0025 0.005 %v o /ma pwmf s pwm switching frequency 1.16 1.7 2.08 mhz r dson -n nmos switch on resistance i sw = 100 ma 0.25 0.4 r dson -p pmos switch on resistance i sw = 100 ma 0.25 0.45 i swl switching current limitation (1) 1.6 a efficiency (1) i o = 10ma to 100ma 80 % i o = 100ma to 0.7a 85 t shdn thermal shutdown 130 150 c t hys thermal shutdown hysteresis 15 c %v o / i o load transient response i o = 100ma to 700ma, t a = 25c t r = t f 200ns, c o =22f (1) -5 +5 %v o %v o / i o short circuit removal response i o = 10ma to i o = short, t a = 25c (1) -10 +10 %v o 1. guaranteed by design, but not tested in production.
electrical characteristics st1s12xx, st1s12xx12, st1s12xx18 8/20 doc id 14314 rev 5 v in =v en = 3.6 v, c in = 4.7 f, c o =10 f, l = 2.2 h, t j = -40 to 125 c (unless otherwise specified. typical values are referred to 25 c). table 8. electrical characteristics for st1s12g18 symbol parameter test conditions min. typ. max. unit out output feedback pin t j =-40 to 125c 1.746 1.8 1.854 v i o v o pin bias current 15 20 a v in minimum input voltage i o = 10ma to 0.7a 2.5 v i q quiescent current v in =v en, v fb =2v 500 650 a v en = 0, t j = -40c to 85c 1 a i o output current v in = 2.5v to 5.5v (1) 0.7 a v en enable threshold device on, v i = 2.5v to 5.5v 1.5 v device off 0.5 i en enable pin current 1 a %v o / v in reference line regulation v in = 2.5v to 5.5v (1) 0.05 0.1 %v o / v in %v o / i o reference load regulation i o = 10ma to 700ma (1) 0.0025 0.005 %v o /ma pwmf s pwm switching frequency 1.16 1.7 2.08 mhz r dson -n nmos switch on resistance i sw = 100ma 0.25 0.4 r dson -p pmos switch on resistance i sw = 100ma 0.25 0.45 i swl switching current limitation (1) 1.6 a efficiency (1) i o = 10ma to 100ma 80 % i o = 100ma to 0.7a 90 t shdn thermal shutdown 130 150 c t hys thermal shutdown hysteresis 15 c %v o / i o load transient response i o = 100ma to 700ma, t a = 25c t r = t f 200ns, c o =22f (1) -5 +5 %v o %v o / i o short circuit removal response i o = 10ma to i o = short, t a = 25c (1) -10 +10 %v o 1. guaranteed by design, but not tested in production.
st1s12xx, st1s12xx12, st1s12xx18 typical application doc id 14314 rev 5 9/20 5 typical application figure 3. application circuit
application notes st1s12xx, st1s12xx12, st1s12xx18 10/20 doc id 14314 rev 5 6 application notes the st1s12 is an adjustable current mode pwm step-down dc-dc converter with internal 0.7 a power switch, packaged in tsot23-5l. this device is a complete 0.7 a switching regulator, with its internal compensation eliminating the need for additional components. because the st1s12 an adjustable regulator, the output voltage is determined by an external resistor divider. the desired value is derived by the following equation: equation 1 v o = v fb [1 + r 1 / r 2 ] for the device to function only a few component are required: an inductor, two capacitors and the resistor divider. the inductor selected must be capable of non saturation at peak current level. moreover, its value can be selected taking into account that a large inductor value increases efficiency at low output current and reduces output voltage ripple, while a smaller inductor can be used when it is important to reduce package size and the total cost of the application. finally, the st1s12 has been designed to work properly with x5r or x7r smd ceramic capacitors both at the input and at the output. these types of capacitors, due to their very low series resistance (esr), minimize the output voltage ripple. other low esr capacitors can be used according to the need of the application without compromising the correct functioning of the device.
st1s12xx, st1s12xx12, st1s12xx18 typical performance characteristics doc id 14314 rev 5 11/20 7 typical performance characteristics unless otherwise specified, refer to the typical application circuit under the following conditions: c in = 4.7 f, c out = 10 f, l = 2.2 h figure 4. voltage feedback vs. temperature figure 5. drop vs. temperature figure 6. oscillator frequency vs. temperature figure 7. efficiency vs. output current figure 8. efficiency vs. output current figure 9. efficiency vs. temperature 550 570 590 610 630 650 -75 -50 -25 0 25 50 75 100 125 150 175 t [c] v fb [mv] v in =v en =3.6v, i out =10ma, v out =1.8v 550 570 590 610 630 650 -75 -50 -25 0 25 50 75 100 125 150 175 t [c] v fb [mv] v in =v en =3.6v, i out =10ma, v out =1.8v 0 0.1 0.2 0.3 0.4 0.5 -75 -50 -25 0 25 50 75 100 125 150 175 t [c] drop [v] i out =700ma , v out =2.7v, duty cycle=100% 0 0.1 0.2 0.3 0.4 0.5 -75 -50 -25 0 25 50 75 100 125 150 175 t [c] drop [v] i out =700ma , v out =2.7v, duty cycle=100% 1.1 1.3 1.5 1.7 1.9 2.1 2.3 -75 -50 -25 0 25 50 75 100 125 150 175 t [c] pwm freq.[mhz] v in =v en =3.6v, v fb =0.65v, v out =1.8v 1.1 1.3 1.5 1.7 1.9 2.1 2.3 -75 -50 -25 0 25 50 75 100 125 150 175 t [c] pwm freq.[mhz] v in =v en =3.6v, v fb =0.65v, v out =1.8v 0 10 20 30 40 50 60 70 80 90 100 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 i ou t [a] efficiency [%] v in =v en =3v, i out =from 10ma to 700ma, v out =1.2v 0 10 20 30 40 50 60 70 80 90 100 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 i ou t [a] efficiency [%] v in =v en =3v, i out =from 10ma to 700ma, v out =1.2v 0 10 20 30 40 50 60 70 80 90 100 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 i ou t [a] efficiency [%] v in =v en =3.6v, i out =from 10ma to 700ma, v out =1.8v 0 10 20 30 40 50 60 70 80 90 100 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 i ou t [a] efficiency [%] v in =v en =3.6v, i out =from 10ma to 700ma, v out =1.8v 0 10 20 30 40 50 60 70 80 90 100 -75 -50 -25 0 25 50 75 100 125 150 175 t [c] efficiency [%] i out =100ma i out =700ma v in =v en =3.6v, v out =1.8v 0 10 20 30 40 50 60 70 80 90 100 -75 -50 -25 0 25 50 75 100 125 150 175 t [c] efficiency [%] i out =100ma i out =700ma v in =v en =3.6v, v out =1.8v
typical performance characteristics st1s12xx, st1s12xx12, st1s12xx18 12/20 doc id 14314 rev 5 figure 10. efficiency vs. temperature figure 11. supply current vs. temperature figure 12. quiescent current vs. temperature figure 13. enable voltage vs. temperature figure 14. enable voltage vs. temperature figure 15. reference line regulation vs. temperature i out =100ma i out =700ma 0 10 20 30 40 50 60 70 80 90 100 -75 -50 -25 0 25 50 75 100 125 150 175 t [c] efficiency [%] v in =v en =3v, v out =1.2v i out =100ma i out =700ma 0 10 20 30 40 50 60 70 80 90 100 -75 -50 -25 0 25 50 75 100 125 150 175 t [c] efficiency [%] v in =v en =3v, v out =1.2v 1 2 3 4 5 6 7 8 -75 -50 -25 0 25 50 75 100 125 150 175 t [c] i supply [ma] v in =v en = 3v, v out =1.2v, no load 1 2 3 4 5 6 7 8 -75 -50 -25 0 25 50 75 100 125 150 175 t [c] i supply [ma] v in =v en = 3v, v out =1.2v, no load 350 370 390 410 430 450 470 490 510 -75 -50 -25 0 25 50 75 100 125 150 175 t [c] i supply [a] v in =v en = 3.6v, v fb =0.65v, c in =c out =10f, no switching 350 370 390 410 430 450 470 490 510 -75 -50 -25 0 25 50 75 100 125 150 175 t [c] i supply [a] v in =v en = 3.6v, v fb =0.65v, c in =c out =10f, no switching 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 -75 -50 -25 0 25 50 75 100 125 150 175 t [c] v en [v] on off v in =2.5v, i out =10ma, c in =c out =10f, v out =1.8v 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 -75 -50 -25 0 25 50 75 100 125 150 175 t [c] v en [v] on off v in =2.5v, i out =10ma, c in =c out =10f, v out =1.8v 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 -75 -50 -25 0 25 50 75 100 125 150 175 t [c] v en [v] on off v in =5.5v, i out =10ma, c in = c out =10f, v out =1.8v 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 -75 -50 -25 0 25 50 75 100 125 150 175 t [c] v en [v] on off v in =5.5v, i out =10ma, c in = c out =10f, v out =1.8v -0.6 -0.4 -0.2 -0 0.2 0.4 0.6 -75 -50 -25 0 25 50 75 100 125 150 175 t [c] line [%v out / v in ] v in =v en = 2.5v to 5.5v, c in =c out =10f, i out =10ma, v out =1.8v -0.6 -0.4 -0.2 -0 0.2 0.4 0.6 -75 -50 -25 0 25 50 75 100 125 150 175 t [c] line [%v out / v in ] v in =v en = 2.5v to 5.5v, c in =c out =10f, i out =10ma, v out =1.8v
st1s12xx, st1s12xx12, st1s12xx18 typical performance characteristics doc id 14314 rev 5 13/20 figure 16. reference load regulation vs. temperature figure 17. nmos switch on resistance vs. temperature figure 18. pmos switch on resistance vs. temperature figure 19. switching current limitation vs. temperature figure 20. switching current limitation vs. input voltage figure 21. output voltage vs. input voltage 0 0.001 0.002 0.003 0.004 0.005 -75 -50 -25 0 25 50 75 100 125 150 175 t [c] load [%v out /ma] v in =3.6v, i out from 10ma to 0.7a, v out =1.8v 0 0.001 0.002 0.003 0.004 0.005 -75 -50 -25 0 25 50 75 100 125 150 175 t [c] load [%v out /ma] v in =3.6v, i out from 10ma to 0.7a, v out =1.8v 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 -75 -50 -25 0 25 50 75 100 125 150 175 t [c] r dson -n [ohm] v in =v en =3.6v, c in =c out =10f, v out =1.2v 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 -75 -50 -25 0 25 50 75 100 125 150 175 t [c] r dson -n [ohm] v in =v en =3.6v, c in =c out =10f, v out =1.2v 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 -75 -50 -25 0 25 50 75 100 125 150 175 t [c] r dson -p [ohm] v in =v en =3.6v, c in =c out =10f, v out =1.2v 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 -75 -50 -25 0 25 50 75 100 125 150 175 t [c] r dson -p [ohm] v in =v en =3.6v, c in =c out =10f, v out =1.2v 0.5 0.8 1.1 1.4 1.7 2 2.3 2.6 -75 -50 -25 0 25 50 75 100 125 150 175 t [c] i sw [a] v in =v en =3.6v, c in =c out =10f, v out =1.8v 0.5 0.8 1.1 1.4 1.7 2 2.3 2.6 -75 -50 -25 0 25 50 75 100 125 150 175 t [c] i sw [a] v in =v en =3.6v, c in =c out =10f, v out =1.8v 0 0.5 1 1.5 2 2.5 3 22.533.544.555.56 v in [v] i sw [a] v in =v en from 2.5 to 5.5v, c in =c out =10f, v out =1.8v 0 0.5 1 1.5 2 2.5 3 22.533.544.555.56 v in [v] i sw [a] v in =v en from 2.5 to 5.5v, c in =c out =10f, v out =1.8v 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 0123456 v in [v] v out [v] 125c 25c 0c -25c -40c v in =v en from 0 to 5.5v, i out =700ma, c in =c out =10f 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 0123456 v in [v] v out [v] 125c 25c 0c -25c -40c v in =v en from 0 to 5.5v, i out =700ma, c in =c out =10f
typical performance characteristics st1s12xx, st1s12xx12, st1s12xx18 14/20 doc id 14314 rev 5 figure 22. line transient figure 23. load transient v in = v en from 4.5 v to 5.5 v, i out = 350 ma, c in = c out = 10 f, v out = 1.8 v v in = v en = 3 v, i out = 100 ma to 700 ma, t r = t f = 200 ns figure 24. start-up transient figure 25. enable transient v in = v en from 0 v to 6 v, i out = 350 ma, c in = c out = 10 f, v out = 1.8 v v in = 3.6, v en from 0 v to 2 v, i out = 350 ma, c in = c out = 10 f, v out = 1.8 v v in v out v out i out v in v out v en v out
st1s12xx, st1s12xx12, st1s12xx18 package mechanical data doc id 14314 rev 5 15/20 8 package mechanical data in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com . ecopack ? is an st trademark.
package mechanical data st1s12xx, st1s12xx12, st1s12xx18 16/20 doc id 14314 rev 5 dim. mm. mil s . min. typ. max. min. typ. max. a1.14 3 . 3 a1 0 0.1 3 . 9 a2 0.7 1.0 27.6 39 .4 b 0. 3 0.5 11. 8 1 9 .7 c0.0 8 0.2 3 .1 7. 9 d2. 9 114.2 e2. 8 110.2 e1 1.6 6 3 .0 e0. 9 5 3 7.4 e1 1. 9 74. 8 l0. 3 0.6 11. 8 2 3 .6 t s ot2 3 -5l mechanical data 72 8 27 8 0b
st1s12xx, st1s12xx12, st1s12xx18 package mechanical data doc id 14314 rev 5 17/20 dim. mm. inch. min. typ. max. min. typ. max. a1 8 0 7.0 8 6 c 12. 8 1 3 .0 1 3 .2 0.504 0.512 0.51 9 d 20.2 0.7 9 5 n60 2. 3 62 t 14.4 0.567 ao 3 .1 33 .2 33 . 33 0.12 3 0.127 0.1 3 1 bo 3 .07 3 .17 3 .27 0.120 0.124 0.12 8 ko 1.27 1. 3 7 1.47 0.050 0.054 0.0.5 8 po 3 . 9 4.0 4.1 0.15 3 0.157 0.161 p 3 . 9 4.0 4.1 0.15 3 0.157 0.161 tape & reel t s ot2 3 -5l mechanical data
package mechanical data st1s12xx, st1s12xx12, st1s12xx18 18/20 doc id 14314 rev 5 figure 26. tsot23-5l footprint recommended data table 9. footprint data values mm. inch. a 3.50 0.138 b 1.10 0.043 c 0.60 0.024 d 0.95 0.037 e 1.20 0.047 f 2.30 0.090
st1s12xx, st1s12xx12, st1s12xx18 revision history doc id 14314 rev 5 19/20 9 revision history table 10. document revision history date revision changes 10-jan-2008 1 initial release. 01-feb-2008 2 modified: figure 3 on page 9 . 23-feb-2010 3 modified: v in value table 3 on page 5 . 23-jun-2011 4 modified: fb unit table 6 on page 6 . 17-feb-2012 5 modified: quiescent current max value 600 ==> 650 table 6 on page 6 , table 7 on page 7 and table 8 on page 8 .
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