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1 gm 7230 150khz, 3 a step down volt age s witching regula to rs gm7230 v 2.02 ww w . g am ma mi c r o . c o m.tw application pre - regulator f o r linear regulators high - efficien c y step - d o w n bu c k regu l ator on - card/b o ard s w it c h i n g re g u l a tors positive to n eg a tive con v erter (buck - b o ost) lcd monitors description gm 7230 series is designed to provi d e all the active function for a step - d o w n (b u ck) s w itc h ing r egu l ator, and drives a maximum load current as high as 3a line a nd l o ad r egu l ati o n s . gm 7230 is a va il a b le in f i xed out p u t volta g es of 3. 3 v, 5v, and a versat i le adjust a b le o u tput versi o n. t hese reg u lat o rs are sim p le t o u s e and r eq u ire m ini mu m num b e r of ex t e rnal co m p on ents. the f eatures inclu d e inte rn al frequ e n c y c o m pen s ation a nd a fix e d - fre q ue nc y osc i l lator. t he gm 7230 is high - efficie nc y rep l acem e n ts for popul a r three - termi n a l lin e a r re g u la t o rs, and is r eq u iri n g a sm a l l e r heat s i nk or ev e n no n e ed h ea t sink. gm 7230 perf o rms w e l l w i t h standa r d in d u c tors from most of manufactu re rs, and simp l i f y ing the des i gn of s w it c h - mode p o w e r s u p p li e s. exter n al shut d o w n is incl u d e d w ith 80 a ( t y p i c al) stan db y current. t h e output s w it c h has c y c l e - b y - c y c le curr e nt limiti n g as w e ll as thermal shu t d o w n for full protecti o n un d er fault con d ition s . gm 7230 o p er a tes at a s w it c h i ng fre q u e n c y o f 150 khz w h i c h all o w i ng smaller size filter compo n ents than w h at w o u l d be ne e ded w i th lo w e r freq u en c y s w it c h i n g r e gu l ators. gm 7230 series are available in a standard 5 - lead to - 220, to220b and to263 packages. features ? 3.3v, 5v, 12v a n d ad j u st able output ve r sions ? adjust a b le ve r sion o u tput vol t age r a nge 1.2 3 v to 37v ? v out accuracy is to 2 % under specified input voltage the output load conditions ? input volta g e ran g e up to 40v ? req u ires o n l y 4 ex t e rn a l co m po n ents with high effic i en c y ? t t l shutd o w n c ap a bili t y, l o w p o w e r st a nd b y mode ? built - in t h ermal shutd o w n , cu r rent limit prot e ction ? uses stan d ard induc t o rs ? 150 khz fixed f r eq u en c y inte rn al osci l lator t ypical application circuits unregulated dc input c in 680 f v in gm 7230 - 5.0 feedback output l1 68 h 5 v regulated outpu t, c out 220 f d1 1n582 4 gnd 1 4 2 3 5 on/off
2 gm 7230 v 2.02 gm 7230 150khz, 3 a step down voltage s witching regula to rs marking information and pin configurations (top view) to - 220 - 5 to - 220b - 5 to - 263 - 5 marking information and pin configurations C green products (top view) to - 220 - 5 to - 220b - 5 to - 263 - 5 gm 7230 vvayww gm 7230 vvayww gm 7230 vvayww 1. v in 2 . output 3 . gnd 4 . feedback 5 . on/off 1. v in 2 . output 3 . gnd 4 . feedback 5 . on/off 1. v in 2 . output 3 . gnd 4 . feedback 5 . on/off gm 7230g vvayww gm 7230g vvayww gm 7230g vv ayww 1. v in 2 . output 3 . gnd 4 . feedback 5 . on/off 1. v in 2 . output 3 . gnd 4 . feedback 5 . on/off 1. v in 2 . output 3 . gnd 4 . feedback 5 . on/off g: green product vv: voltage suffix (1 5 = 1. 5 v, 50 = 5.0v a = adj ) a: assembly / t est site code y: year ww: week g: green product vv: voltage suffix (1 5 = 1. 5 v, 50 = 5.0v a = adj ) a: assembly / test sit e code y: year ww: week
3 gm 7230 150khz, 3 a step down volt age s witching regula to rs gm7230 v 2.02 ordering information C pb free products ordering n u mber output voltage packa g e shipping gm7230 - ata5t adj to - 263 - 5 50 units / tube gm7230 - ata5 r to - 263 - 5 800 units / reel gm7230 - at b 5t to - 220 - 5 50 units / tube gm7230 - at b5bt to - 220 - 5b 50 units / tube gm7230 - 3.3 ta5t 3.3 to - 263 - 5 50 units / tube gm7230 - 3.3 t a5 r to - 263 - 5 800 uni ts / reel gm7230 - 3.3 t b 5t to - 220 - 5 50 units / tube gm7230 - 3.3 t b5bt to - 220 - 5b 50 units / tube gm7230 - 5.0 ta5t 5.0 to - 263 - 5 50 units / tube gm7230 - 5.0 t a5 r to - 263 - 5 800 units / reel gm7230 - 5.0 t b 5t to - 220 - 5 50 units / tube gm7230 - 12 t b5bt to - 220 - 5b 50 units / tube gm7230 - 12 ta5t 12 to - 263 - 5 50 units / tube gm7230 - 12 t a5 r to - 263 - 5 800 units / reel gm7230 - 12 t b 5t to - 220 - 5 50 units / tube gm7230 - 12 t b5bt to - 220 - 5b 50 units / tube ordering information C green products ordering n u mber output voltage pac ka g e shipping gm7230 - ata5t g adj to - 263 - 5 50 units / tube gm7230 - ata5 rg to - 263 - 5 800 units / reel gm7230 - at b 5t g to - 220 - 5 50 units / tube gm7230 - at b5btg to - 220 - 5b 50 units / tube gm7230 - 3.3 ta5t g 3.3 to - 263 - 5 50 units / tube gm7230 - 3.3 t a5 rg to - 263 - 5 800 units / reel gm7230 - 3.3 t b 5t g to - 220 - 5 50 units / tube gm7230 - 3.3 t b5btg to - 220 - 5b 50 units / tube gm7230 - 5.0 ta5t g 5.0 to - 263 - 5 50 units / tube gm7230 - 5.0 t a5 rg to - 263 - 5 800 units / reel gm7230 - 5.0 t b 5t g to - 220 - 5 50 units / tube gm7230 - 12 t b5btg to - 220 - 5b 50 units / tube gm7230 - 12 ta5t g 12 to - 263 - 5 50 units / tube gm7230 - 12 t a5 rg to - 263 - 5 800 units / reel gm7230 - 12 t b 5t g to - 220 - 5 50 units / tube gm7230 - 12 t b5btg to - 220 - 5b 50 units / tube
4 gm 7230 v 2.02 gm 7230 150khz, 3 a step down voltage s witching regula to rs absolute maximum ratings (note 1) rating value un it maximum supply voltage 45 v sd pin input voltage / feed back pin voltage - 0.3 + v in + 0.3 v output voltage to ground (steady state) - 0.3 + v in + 0.3 v power dissipation internally limited - thermal resistance C junction to ambient ( ? ja ) ** 2 square inch of fr - 4, double sided, 1oz. minimum copper weight , is recommended 36 /w storage temperature range - 65 to 150 maximum junction temperature + 150 operating temperature range - 40 to 125 minimum eds rating (note 2) 2 kv lead temperature (soldering, 10 sec) + 260 block diagram current source bias 1.235v reference 2.5v reference start up comp 220 220mv sd v in comp 3a switch 2.5 v current limit driver latch comp amp gm r2 r1 = 2.5k thermal limit 150khz osc reset freq. shift output gnd for 3.3v, r2 = 4.2k for 5.0v, r2 = 7.6k for adj, r2 = 0 and r1 = open fb
5 gm 7230 150khz, 3 a step down volt age s witching regula to rs gm7230 v 2.02 electrical characteristics: gm 7230 - adj (specifications with standard type face are for t = 25 c , and those with bold face type apply over full operating temperature rage) parameter condition symbol m in t yp m ax u nit output voltage 4.5v ? v in ? 40v, 0.2a ? i load ? 3a , v out = 3 v v out 1. 193 1.230 1.267 v 1.180 1.280 efficiency v in =12v, i l o ad = 2 .0a, v out = 3 v 73 % electrical characteristics: gm 7230 - 3.3 (specifications with standard type face are for t = 25 c , and those with bold face type apply over full operating temperature rage) parameter condition symbol m in t yp m ax u nit output voltage 4. 7 5v ? v in ? 40v, 0.2a ? i load ? 3a v out 3.1 68 3.300 3. 432 v 3. 135 3.4 65 efficiency v in =12v, i l o ad = 2 .0a 73 % electrical characteristics: gm 7230 - 5.0 (specifications with standard type face are for t = 25 c , and those with bold face type apply over full operating temperature rage) parameter condition symbol m in t yp m ax u nit output voltage 7 v ? v in ? 40v, 0.2a ? i load ? 3a v out 4.8 0 0 5.000 5. 20 0 v 4. 75 00 5.2 5 0 efficiency v in =12v, i l o ad = 2 .0a 80 % electrical characteristics: gm7230 - 12 (spec ifications with standard type face are for t = 25 c , and those with bold face type apply over full operating temperature rage) parameter condition symbol m in t yp m ax u nit output voltage 15 v ? v in ? 40v, 0. 5 a ? i load ? 3a v out 11.52 12.00 12.48 v 11. 40 12.60 efficiency v in =1 5 v, i l o ad =3.0a 88 %
6 gm 7230 v 2.02 gm 7230 150khz, 3 a step down voltage s witching regula to rs electrical characteristics: all output voltage versions (specifications with standard type face are for t j = 25 c , and those with bold face type apply over full operating temperature rage . unless otherwise specified, v in = 12v for 3.3v, 5v, a nd adjustable version, and v in = 24v for 12v version, i load = 500ma ) parameter condition symbol m in t yp m ax u nit feedback bias current v fb = 1.3 v (adjustable version only) i b - 10 50 na 1 00 oscillator frequency (note 6 ) f o 127 150 173 khz 11 0 173 saturation voltage i out = 3a (notes 7 , 8 ) v sat - 1. 16 1.4 v 1.5 max duty cycle (on) (note 8 ) dc 100 - % min duty cycle (off) (note 9) dc 0 % current limit peak current (notes 7 , 8 ) l cl 3.4 a output leakage current output = 0v (not es 7 , 9, 10 ) l l - - 100 a output = - 0.9 v (note 10) - 2 - ma quiescent current (note 9 ) l q - 5 - ma standby quiescent current sd pin = 5v (off) , note 10 l stby - 70 200 a sd pin logic lnput level low (on ) v ih - 1. 3 0.6 v high (off ) v il 2. 0 1. 3 - sd pin lnput current v loglc = 2.5v (off) i h 5 15 a v loglc = 0.5v (on) i l 0 .02 5 a note 1: abs ol u te m a ximum ratings in d ica t e limits b e y on d w h i c h da ma ge to the d e v i ce m a y occur. operating ratings i n dica t e co n d iti o ns for w h i c h the device is i n te n ded to be f un ctional, but d o not g u aran t e e specific p e rfo r mance li m its. f o r guar a n te e d specifi c atio n s and test con d it i ons, see the electrical c ha r acteristics. note 2: t he human b od y m o d e l is a 1 0 0pf capaci t or disc ha rged thr o ugh a 1.5 k ? resistor i n to each p in. note 3: t y pi ca l num b e rs are at 2 5 c a n d r e pres e n t the most like l y norm. note 4: all limits guarant e ed at room temperature (standa r d type face) a n d at temperat u re extre m es (bold t y p e face). all room temperatu r e l i mits are 1 0 0% produ c t i on te s t ed. all li m its a t temperature extre m es a r e gua r ante e d via correlati o n us i ng stan d ard s t atistical qu a li t y control (sqc) methods. all limits are u s ed to calc u late avera g e outg o ing qu a li t y le v el (aoql). note 5: external comp o n e n ts such a s the catch diode, ind uc t o r, input and output capaci t ors, and voltage program m ing r e sistors can affect s w itchi n g regu l a t or s y st e m performanc e . w hen the gm 7230 is used as sh o w n in t he figu r e 1 t e st circuit, s y stem perform an ce w i ll be as sh o w n in s y stem para m ete r s section of elec t rical c h aracter i stics. note 6: t he s w it c h i n g freq ue n c y is r e du c ed w h en t h e sec o nd stage cur re n t limit is activ a ted. note 7: no di o de, in d u ctor or capacitor con n ected to out p u t pin. note 8: feed b ack pin re m o v e d from output a nd co n nect e d to 0v to force the output trans i stor s w itch on. note 9: feed b ack pin re m o v e d from output a nd co n nect e d to 12v for the 3 .3v, 5 v, and the adj. version.
7 gm 7230 150khz, 3 a step down volt age s witching regula to rs gm7230 v 2.02 test circuit and layout guidelines care ful layout is important with any switching regulators. rapidly switching curren ts associated with wiring inductance generate voltage transients which can cause problems. to minimize inductance and ground loops, the lengths of the leads indicated by heavy lines in figure 1&2 below should be kept as short as possible. single point grou nding (as indicated or ground plane construction should be used for best results. when using the adjustable version, place the programming resistors as close as possible to gm 7230 , to keep the sensitive feedback wiring short. figure 1 fixed ouput votlage version s c in = 47 0f out = 22 0 f figure 2 adjustable ouput votlage version s c in = 47 0f out = 22 0 f out = v ref (1 + r2/r1) v in unregulatedd dc input c in 100f c out 68 0f l1 68 h d1 v out l o a d 4 feedback 2 v out 3 gnd 1 v in gm 7230 - x.x v in unregulatedd dc input c in 100f c out 68 0f l1 68 h d1 v out l o a d 4 feedback 2 v out 3 gnd 1 v in gm 7230 - a r2 r1 5 on/off 5 on/off
8 gm 7230 v 2.02 gm 7230 150khz, 3 a step down voltage s witching regula to rs figure 3 . s w itch saturation voltage 1.4 v l n =12v 1.3 1.2 1.1 t j = - 40c 1.0 0.9 0.8 125 c 0.7 0.6 1 2 0 3 4 s w ltch cu r re n t (a) s a tur a t l on vo l t age ( v) 25 c figure 4 . s w it c h current l imit 5.5 v ou t =5 v 5.0 4.5 4 . 0 3.5 - 50 - 2 5 0 2 5 5 0 75 100 1 2 5 jun c tlon temp e r ature (c) s w l t c h curr e n t l l m l t ( a ) v ln = 1 2v figure 5 . dropout voltage 1.6 i nput - output differential (v) 1. 4 1. 2 1. 0 0.8 0.6 l = 33h r ind = 0.04 v out = v reg = 50mv i load = 3a i load = 1a - 50 - 25 0 25 50 75 100 junction temperature ( c ) figure 6 . operating quiescent current swltch current (ma) switch on switch off 24 20 16 12 8 4 0 - 50 - 25 0 25 50 75 100 junction temperature ( c ) 125 4.5v < v in < 40v i switch = 0 figure 8 . min i mum operati n g sup pl y v o lt a g e junction temperature (c) supply voltage (v) - 50 - 25 0 25 50 75 100 125 v out = 1.23v i load = 120ma 5 4 3 2 1 0 figure 9 . sd pin current (sinking) 0 5 10 15 20 25 sd pln volta ge( v) current(a) v in = 40v t j = - 40 c an d 125 c 8 6 5 4 3 2 7 1 0 figur e 10 . s w it c h ing fr e qu e n c y frequency (khz) junction temperature (c) - 50 - 25 0 25 50 75 100 125 160 150 145 140 135 130 155 120 t j = - 40 c and 125 c t j = 25 c v on/off = 5 v supply voltage (v) current (a) 1 5 0 80 60 40 20 0 0 10 20 30 40 1 0 0 figure 7 . shutdown quiescent current typical performance characteristics
9 gm 7230 150khz, 3 a step down volt age s witching regula to rs gm7230 v 2.02 package outline dimensions C to - 263 - 5 package outline dimensions C to - 220 - 5 0.400 + 0.015 0.400 C 0.005 (0.38+ 0.18) ( 0.38 + - 0.03) 0.015 + 0.007 0.015 C 0.001 (0.38+ 0.18) (0.38 + - 0.03) 0. 10 5 + 0.0 10 0. 105 C 0. 010 (2.67 + 0.25 ) (2.67 + - 0.38 ) 0.525 C 0.555 (13.34 C 14.10) 0.175 C 0.185 (4.45 C 4.75) 0.048 C 0.052 (1.22 C 1.32) 0.057 C 0.077 (1.45 C 1.96) 0.030 C 0.040 (0.76 C 1.02) 0.100 C 0.120 (2.54 C 3.05) 0.149 C 0.153 (3.78 C 3.89) 0.149 C 0.153 (3.78 C 3.89) 0.330 C 0.350 (8.38 C 8.89) 0.176 C 0.184 (4.47 C 4.67) 0.046 C 0.054 (1.17 C 1.37) 0.061 C 0.069 (1.56 C 1.76) 0.012 C 0.021 (0.31 C 0.53) 0.092 C 0.108 (2.34 C 2.74) 3 0 - 8 7 0.389 C 0.408 (9.88 C 10.18) 0.596 C 0.612 (15.14 C 15.54) 0.224 C 0.272 (5.70 C 6.90) 0.028 C 0.036 (0.71 C 0.91) 0.067 (1.70) t yp. 0.322 C 0.339 (8.20 C 8.60) 0.200 C 0.216 (5.08 C 5.48)
10 gm 7230 v 2.02 gm 7230 150khz, 3 a step down voltage s witching regula to rs package outline dimensions C to - 220b - 5 0.394 C 0.408 ( 10.01 C 10.36 ) inches (mm) 0.957 C 1.028 ( 24.3 C 26.1 ) 0.988 C 1.130 ( 25.1 C 28.7 ) 0. 099 C 0.111 ( 2 .52 C 2 .82 ) 0. 156 C 0.179 ( 3.95 C 4.55 ) 0. 299 C 0.337 ( 7.60 C 8.5 5 ) 0. 046 C 0.054 ( 1.17 C 1.37 ) 0. 176 C 0.184 ( 4.47 C 4.67 ) 0. 327 C 0.366 ( 8.30 C 9.30 ) 0.138 C 0.142 ( 3.51 C 3.61 ) 0.049 C 0.142 ( 1.25 C 3.60 ) 0.218 C 0.383 ( 5.53 C 9.75 ) 0 . 264 C 0.2 72 ( 6.70 C 6.90 ) 0.150 C 0.254 ( 3.80 C 6.45 ) 0.220 typ ( 1.70 typ ) 0.149 C 0.153 ( 3.79 C 3.89 )
11 gm 7230 150khz, 3 a step down volt age s witching regula to rs gm7230 v 2.02 o rdering number g m 7230 a ta5 r g apm gamma micro circuit type output voltage package type shipping type a: adj 3.3 = 3.3v 5.0 = 5.0v 12 = 12.0v ta5: to263 - 5 tb5: to - 220 - 5 t b5b: to - 220b - 5 r: taping & reel t: tube blank: pb - free g: green note: pb - free products : ? rohs compliant and compatible with the current require - ments of ipc/jedec j - std - 020. ? suitable for use in pb - fr ee soldering processes with 100% matte tin (sn) plating. green products : ? l ead - free (rohs compliant) ? h alogen free(br or cl does not exceed 900ppm by weight in homogeneous material and total of br and cl does not exceed 1500ppm by weight)

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