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september 2010 doc id 17927 rev 1 1/11 11 ST1S30 3 a, 1.5 mhz pwm step-d own switching regulator with synchronous rectification features 1.5 mhz fixed frequency pwm with current control mode 3 a output current capability typical efficiency: > 90% 2 % dc output voltage tolerance two versions available: power good or inhibit integrated output over-voltage protection non switching quiescent current: (typ) 1.5 ma over temperature range r dson (typ) 100 m utilizes tiny capaci tors and inductors operating junction temp. -25 c to 125 c available in dfn8 (4 x 4 mm) exposed pad description the ST1S30 is a step-down dc-dc converter optimized for powering low output voltage applications. it supplies a current in excess of 3 a over an input voltage range from 2.7 v to 6 v. a high pwm switching frequency (1.5 mhz) allows the use of tiny surface-mount components. moreover, since the required synchronous rectifier is integrated, the number of the external components is reduced to minimum: a resistor divider, an inductor and two capacitors. the power good function continuously monitors the output voltage. an open drain power good flag is released when the output voltage is within regulation. in addition, 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 output current limited to prevent damages due to accidental short circuit. the ST1S30 is available in the dfn8 (4 x 4 mm) package. dfn8 (4 x 4 mm) table 1. device summary order codes package note ST1S30pur (1) dfn8 (4 x 4 mm) pg version ST1S30ipur inhibit version 1. available on request. www.st.com
contents ST1S30 2/11 doc id 17927 rev 1 contents 1 diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 typical application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
ST1S30 diagram doc id 17927 rev 1 3/11 1 diagram (*) only for ST1S30i (**) only for ST1S30 figure 1. schematic diagram
pin configuration ST1S30 4/11 doc id 17927 rev 1 2 pin configuration figure 2. pin connections (top view) table 2. pin description pin n symbol name and function 1 fb feedback voltage 2 gnd system ground 3 sw switching pin 6v in_sw power supply for the mosfet switch 7v in_a power supply for analog circuit 8 inh/pg inhibit (inh) for ST1S30ipur or power good (pg) for ST1S30pur exposed pad gnd to be connected to pcb ground plane for optimal electrical and thermal performance 4, 5 nc not internally connected. can be connected to gnd or left floating !-v ST1S30ipur ST1S30pur
ST1S30 maximum ratings doc id 17927 rev 1 5/11 3 maximum ratings note: absolute maximum ratings are those 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_sw positive power supply voltage -0.3 to 7 v v in_a positive power supply voltage -0.3 to 7 v v inh inhibit voltage (i version) -0.3 to v i + 0.3 v switch voltage max. voltage of output pin -0.3 to 7 v v fb feedback voltage -0.3 to 3 v pg power good open drain -0.3 to 7 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 thjc thermal resistance junction-case 10 c/w r thja thermal resistance junction-ambient 40 c/w table 5. esd performance symbol parameter test conditions value unit esd esd protection voltage hbm 2 kv esd esd protection voltage mm 500 v
electrical characteristics ST1S30 6/11 doc id 17927 rev 1 4 electrical characteristics refer to figure 3 application circuit v in_sw = v in_a = 5 v, v o = 1.2 v, c1 = 10 f, c 2 = 22 f, l1 = 2.2 h, t j = -25 to 125 c (unless otherwise specified. typical values are referred to 25 c) table 6. electrical characteristics for ST1S30 symbol parameter test conditions min. typ. max. unit fb feedback voltage 784 800 816 mv i fb v fb pin bias current 600 na v i input voltage i o = 10 ma to 3 a 2.7 5.5 v uv lo under voltage lock out threshold v i rising 2.3 v hysteresis 150 mv ovp overvoltage protection threshold v o rising 1.05 v o 1.1 v o v overvoltage protection hysteresis v o falling 5 % i ovp overvoltage clamping current v o = 1.2 v 300 ma i q quiescent current v inh > 1.2 v, not switching 1.5 2.5 ma v inh < 0.0 v, t = - 30 c to 85 c 1 i o output current v i = 2.7 to 5.5 v (1) 3a %v o / v i output line regulation v i = 2.7 v to 5.5 v, i o = 100 ma (1) 0.16 %v o / v i %v o / i o output load regulation i o = 10 ma to 3 a (1) 0.2 % pwmf s pwm switching frequency v fb = 0.65 v 1.2 1.5 1.8 mhz d max maximum duty cycle 80 87 % pg power good output threshold 0.92 v o v power good output voltage low i sink = 6 ma open drain output 0.4 v r dson -n nmos switch on resistance i sw = 750 ma 0.1 r dson -p pmos switch on resistance i sw = 750 ma 0.1 i swl switching current limitation (1) 3.7 4.4 5.1 a efficiency (1) i o = 10 ma to 100 ma, v o = 3.3 v 65 % i o = 100 ma to 3 a, v o = 3.3 v 85 t shdn thermal shutdown 150 c t hys thermal shutdown hysteresis 20 c %v o / i o load transient response i o = 100 ma to 1 a, t a = 25 c t r = t f 200 ns (1) -10 +10 %v o %v o / i o short circuit removal response i o = 10 ma to i o = short, t a = 25 c (1) -10 +10 %v o 1. guaranteed by design, but not tested in production.
ST1S30 electrical characteristics doc id 17927 rev 1 7/11 refer to figure 4 application circuit v in_sw = v in_a = v inh = 5 v, v o = 1.2 v, c1 = 10 f, c2 = 22, c3 = 1 f, l1 = 2.2 h, t j = -25 to 125 c (unless otherwise specified. typical values are referred to 25 c) table 7. electrical characteristics for ST1S30i symbol parameter test conditions min. typ. max. unit fb feedback voltage 784 800 816 mv i fb v fb pin bias current 600 na v i minimum input voltage i o = 10 ma to 2 a 2.7 v ovp overvoltage protection threshold v o rising 1.05 v o 1.1 v o v overvoltage protection hysteresis v o falling 5 % i q quiescent current v inh > 1.2 v, not switching 1.5 2.5 ma v inh < 0.0 v, t = - 30 c to 85 c 1 a i o output current v i = 2.7 to 5.5 v (1) 3a v inh inhibit threshold device on, v i = 2.7 to 5.5 v 1.3 v device on, v i = 2.7 to 5 v 1.2 device off 0.4 i inh inhibit pin current 2a %v o / v i output line regulation v i = 2.7 v to 5.5 v, i o = 100 ma (1) 0.16 %v o / v i %v o / i o output load regulation i o = 10 ma to 2 a (1) 0.2 0.6 %v o / i o pwmf s pwm switching frequency v fb = 0.65 v 1.2 1.5 1.8 mhz d max maximum duty cycle 80 87 % r dson -n nmos switch on resistance i sw = 750 ma 0.1 r dson -p pmos switch on resistance i sw = 750 ma 0.1 i swl switching current limitation (1) 3.7 4.4 5.1 a efficiency (1) i o = 10 ma to 100 ma, v o = 3.3 v 65 % i o = 100 ma to 3 a, v o = 3.3 v 85 t shdn thermal shutdown 150 c t hys thermal shutdown hysteresis 20 c %v o / i o load transient response i o = 100 ma to 1 a, t a = 25 c t r = t f 200 ns (1) -10 +10 %v o %v o / i o short circuit removal response i o = 10 ma to i o = short, t a = 25 c (1) -10 +10 %v o 1. guaranteed by design, but not tested in production.
typical application circuits ST1S30 8/11 doc id 17927 rev 1 5 typical application circuits note: these typical application circuits are provided to help designing the external components. however, we recommend to thoroughly validate any circuit solution in the real application environment conditions. figure 3. application circuit fot v out > 1.2 v figure 4. application circuit for 0.8 v < v out < 1.2 v
ST1S30 package mechanical data doc id 17927 rev 1 9/11 6 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. figure 5. dfn8 (4x4) mechanical dimensions table 8. dfn8 (4x4) mechanical data dim. mm. min. typ. max. a 0.80 0.90 1.00 a1 0 0.02 0.05 a3 0.20 b 0.23 0.30 0.38 d 3.90 4.00 4.10 d2 2.82 3.00 3.23 e 3.90 4.00 4.10 e2 2.05 2.20 2.30 e 0.80 l 0.40 0.50 0.60 "
revision history ST1S30 10/11 doc id 17927 rev 1 7 revision history table 9. document revision history date revision changes 09-sep-2010 1 first release
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