revision 1, may 2002 www.gammamicro.com 3a step-down voltage regulators GM7130 preliminary 1 the GM7130 series of regulators provide all the active functions for a step-down (buck) switching regulator, and drive 3a load with excellent line and load regulation. GM7130?s are available in fixed output voltages of 3.3v, 5v, 12v, 15v, and a versatile adjustable output version. these regulators are simple to use and require a minimum number of external components. features include internal frequency compensation and a fixed- frequency oscillator. the GM7130 series are high- efficiency replacements for popular three-terminal linear regulators, requiring a smaller heatsink or even no heatsink. the GM7130?s perform well with standard inductors from several manufacturers, simplifying the design of switch-mode power supplies. the GM7130 series guarantee 4% tolerance on output voltage within specified input voltages and output load conditions, and 10% on the oscillator frequency. external shutdown is included, with 50 a (typical) standby current. the output switch has cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions. pre-regulator for linear regulators high-efficiency step-down buck regulator on-card/board switching regulators positive to negative converter (buck-boost) applications: 3.3v, 5v, 12v, 15v, adjustable output versions adjustable version output voltage range 1.23v to 37v 4% max over line and load conditions 3a output current input voltage range 7v to 40v requires only 4 external components high efficiency ttl shutdown capability, low power standby mode thermal shutdown, current limit protection uses standard inductors 52 khz fixed frequency internal oscillator p+ product enhancement tested to-263 (s) 5-lead surface-mount package top view 5 - on/off 4 - feedback 3 - ground 2 - output 1 - v in tab is gnd straight leads 5-lead t o-220 (t) top view gnd 5 - on/off 4 - feedback 3 - ground 2 - output 1 - v in connection diagrams
revision 1, may 2002 www.gammamicro.com 3a step-down voltage regulators GM7130 preliminary 1 + 5 3 l o a d + d1 l1 4 2 absolute maximum ratings 2 g n i t a r e u l a v t i n u e g a t l o v y l p p u s m u m i x a m 5 4v e g a t l o v t u p n i n i p f f o / n o 3 . 0 ? # v # v n i v ) e t a t s y d a e t s ( d n u o r g o t e g a t l o v t u p t u o 0 . 1 -v n o i t a p i s s i d r e w o p d e t i m i l y l l a n r e t n i- e g n a r e r u t a r e p m e t e g a r o t s 0 5 1 + o t 5 6 ?c e r u t a r e p m e t n o i t c n u j m u m i x a m 0 5 1 +c k 5 . 1 = r , f p 0 0 1 = c ( g n i t a r d s e m u m i n i m s )2v k ) s d n o c e s 0 1 , g n i r e d l o s ( e r u t a r e p m e t d a e l 0 6 2 +c block diagram unregulated dc input feed- back v in output c in c out gnd on/off 3 amp switch on/off driver + internal regulator + - - fixed gain error amp 1.23v band - gap reference 52 khz oscillator reset thermal shutdown current limit comparator
revision 1, may 2002 www.gammamicro.com 3a step-down voltage regulators GM7130 preliminary 3 electrical characteristics: GM7130-3.3 (specifications with standard type face are for t j = 25c, and those with boldface type apply over full operating temperature range) r e t e m a r a p s n o i t i d n o c l o b m y s n i m p y t x a m t i n u e g a t l o v t u p t u o v n i i , v 2 1 = d a o l a 5 . 0 = v t u o 4 3 2 . 33 . 36 6 3 . 3v e g a t l o v t u p t u o v 6 # v n i # a 5 . 0 , v 0 4 # i d a o l # a 0 . 3 v t u o / 8 6 1 . 3 5 3 1 . 3 3 . 3/ 2 3 4 . 3 5 6 4 . 3 v y c n e i c i f f e v n i i , v 2 1 = d a o l a 0 . 3 = 0 -5 7-% electrical characteristics: GM7130-5.0 (specifications with standard type face are for t j = 25c, and those with boldface type apply over full operating temperature range) r e t e m a r a p s n o i t i d n o c l o b m y s n i m p y t x a m t i n u e g a t l o v t u p t u o v n i i , v 2 1 = d a o l a 5 . 0 = v t u o 0 0 9 . 40 . 50 0 1 . 5v e g a t l o v t u p t u o v 8 # v n i # a 5 . 0 , v 0 4 # i d a o l # a 0 . 3 v t u o / 0 0 8 . 4 0 5 7 . 4 0 . 5/ 0 0 2 . 5 0 5 2 . 5 v y c n e i c i f f e v n i i , v 2 1 = d a o l a 0 . 3 = 0 -7 7-% electrical characteristics: GM7130-12 (specifications with standard type face are for t j = 25c, and those with boldface type apply over full operating temperature range) r e t e m a r a p s n o i t i d n o c l o b m y s n i m p y t x a m t i n u e g a t l o v t u p t u o v n i i , v 5 2 = d a o l a 5 . 0 = v t u o 6 7 . 1 10 . 2 14 2 . 2 1v e g a t l o v t u p t u o v 5 1 # v n i # a 5 . 0 , v 0 4 # i d a o l # a 0 . 3 v t u o / 2 5 . 1 1 0 4 . 1 1 0 . 2 1/ 8 4 . 2 1 0 6 . 2 1 v y c n e i c i f f e v n i i , v 5 1 = d a o l a 0 . 3 = 0 -8 8-% electrical characteristics: GM7130-15 (specifications with standard type face are for t j = 25c, and those with boldface type apply over full operating temperature range) r e t e m a r a p s n o i t i d n o c l o b m y s n i m p y t x a m t i n u e g a t l o v t u p t u o v n i i , v 5 2 = d a o l a 5 . 0 = v t u o 0 7 . 4 10 . 5 10 3 . 5 1v e g a t l o v t u p t u o v 8 1 # v n i # a 5 . 0 , v 0 4 # i d a o l # a 0 . 3 v t u o / 0 4 . 4 1 5 2 . 4 1 0 . 5 1/ 0 6 . 5 1 5 7 . 5 1 v y c n e i c i f f e v n i i , v 8 1 = d a o l a 0 . 3 = 0 -8 8-%
revision 1, may 2002 www.gammamicro.com 3a step-down voltage regulators GM7130 preliminary 4 electrical characteristics: GM7130-adj (specifications with standard type face are for t j = 25c, and those with boldface type apply over full operating temperature range) r e t e m a r a p s n o i t i d n o c l o b m y s n i m p y t x a m t i n u e g a t l o v k c a b d e e f v n i i , v 2 1 = d a o l v , a 5 . 0 = t u o v 5 = v t u o 7 1 2 . 10 3 2 . 13 4 2 . 1v e g a t l o v k c a b d e e f v 8 1 # v n i # a 5 . 0 , v 0 4 # i d a o l # a 0 . 3 v t u o v 5 = v t u o / 3 9 1 . 1 0 8 1 . 1 0 3 2 . 1/ 7 6 2 . 1 0 8 2 . 1 v y c n e i c i f f e v n i i , v 2 1 = d a o l v , a 3 = t u o v 5 = 0 -7 7-% electrical characteristics: all output voltage versions (specifications with standard type face are for t j = 25c, and those with boldface type apply over full operating temperature range. unless otherwise specified, v in = 12v for the 3.3v, 5.0v and adj version, v in = 25v for 12v version, and v in = 30v for 15v version. i load = 500 ma) r e t e m a r a p s n o i t i d n o c l o b m y s n i m p y t x a m t i n u t n e r r u c s a i b k c a b d e e f v t u o ) y l n o n o i s r e v e l b a t s u j d a ( v 5 =i b -0 5/ 0 0 1 0 0 5 a n y c n e u q e r f r o t a l l i c s o) 1 1 e t o n ( f o / 7 4 2 4 2 5/ 8 5 3 6 z h k e g a t l o v n o i t a r u t a s i t u o ) 4 e t o n ( a 3 =v t a s -4 . 1/ 8 . 1 0 . 2 v ) n o ( e l c y c y t u d x a m) 5 e t o n (c d3 98 9-% t i m i l t n e r r u c) 1 1 , 4 s e t o n ( i l c / 2 . 4 5 . 3 8 . 5/ 9 . 6 5 . 7 a t n e r r u c e g a k a e l t u p t u o v 0 = t u p t u o ) 7 , 6 s e t o n ( v 1 - = t u p t u o i l - - - 5 . 7 2 0 3 a m t n e r r u c t n e c s e i u q) 6 e t o n ( i q -5 0 1a m t n e r r u c t n e c s e i u q y b d n a t s) f f o ( v 5 = n i p f f o / n o i y b t s -0 50 0 2 : a e c n a t s i s e r l a m r e h t ) 8 e t o n ( t n e i b m a o t n o i t c n u j , e g a k c a p t ) 8 e t o n ( t n e i b m a o t n o i t c n u j , e g a k c a p t e s a c o t n o i t c n u j , e g a k c a p t t n e i b m a o t n o i t c n u j , e g a k c a p t) 0 1 e t o n ( 2 a j 2 a j 2 c j 2 a j - - - - 5 6 5 4 2 0 5 - - - - w / c n i p f f o / n o l e v e l t u p n i c i g o l v t u o v 0 =v h i / 2 . 2 4 . 2 4 . 1-v v t u o e g a t l o v t u p t u o l a n i m o n =v l i -2 . 1/ 0 . 1 8 . 0 v t n e r r u c n i p f f o / n o ) f f o ( v 5 = n i p f f o / n o v h i -2 10 3 : a ) n o ( v 0 = n i p f f o / n o i l i -0 0 1 : a
revision 1, may 2002 www.gammamicro.com 3a step-down voltage regulators GM7130 preliminary 5 note 1: absolute maximum ratings indicate limits beyond which damage to the device may occur. operating ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. guaranteed specifications and test conditions are shown in electrical characteristics. note 2: all limits guaranteed at 25 c (standard type face) and over full operating temperature range (bold type face). all 25 c limits are 100% production tested. all limits over full operating temperature range are guaranteed via correlation using standard statistical quality control methods. note 3: external components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. when the GM7130 is used as shown in the figure 2 test circuit, system performance will be as shown in system parameters section of electrical characteristics. note 4: output pin sourcing current. no diode, inductor or capacitor connected to output. note 5: feedback pin removed from output and connected to 0v. note 6: feedback pin removed from output and connected to +12v for the adjustable, 3.3v, and 5v versions, and +25v for the 12v and 15v versions, to force the output transistor off. note 7: v in = 40v note 8: junction to ambient thermal resistance (no external heat sink) for the 5 lead to-220 package mounted vertically, with ? inch leads in a socket, or on a pc board with minimum copper area. note 9: junction to ambient thermal resistance (no external heat sink) for the 5 lead to-220 package mounted vertically, with ? inch leads soldered to a pc board containing approximately 4 square inches of copper area surrounding the leads. note 10: if the to-263 package is used, the thermal resistance can be reduced by increasing the pc board copper area thermally connected to the package. using 0.5 square inches of copper area, 2 ja is 50c/w, with 1 square inch of copper area, 2 ja is 37c/w, and with 1.6 or more square inches of copper area, 2 ja is 32c/w. note 11: the oscillator frequency reduces to approximately 11 khz in the event of an output short or an overload which causes the regulated output voltage to drop approximately 40% from the nominal output voltage. this self- protection feature lowers the average power dissipation of the GM7130 by lowering the minimum duty cycle from 5% down to approximately 2%. electrical characteristics notes
revision 1, may 2002 www.gammamicro.com 3a step-down voltage regulators GM7130 preliminary l o a d 6 v in unregulated dc input fixed output voltage versions feedback 4 2 1 3 5 output 100 h l1 gnd on/off d1 + + c out 1000 f c in 100 f +v in GM7130- fixed output v out (figure 2) test circuit and layout guidelines careful layout is important with any switching regulator. rapidly switching currents 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 2 below should be kept as short as possible. single- point grounding (as indicated in figure 2) or ground plane construction should be used for best results. when using the adjustable version, place the programming resistors as close as possible to the GM7130, to keep the sensitive feedback wiring short. c in ? 100 f, 75v, aluminum electrolytic c out ? 1000 f, 25v, aluminum electrolytic d1 ? schottky, mbr360 l1 ? 100 h, pulse eng. pe-92108 r1 ? 2k, 0.1% r2 ? 6.12k, 0.1%
revision 1, may 2002 www.gammamicro.com 3a step-down voltage regulators GM7130 preliminary 7 l o a d adjustable output voltage versions feedback 4 2 1 3 5 output 100 h l1 gnd on/off d1 + c out 1000 f c in 100 f +v in GM7130-adj v out = 5.0 v 7v - 40v unregulated dc input + r2 r1 (figure 2) where v ref = 1.23v, r1 between 1k and 5k. v out = v ref ( 1 + ) r2 r1 r2 = r1 ( - 1 ) v out v ref typical application (fixed output voltage versions) GM7130 - 5.0 +5v regulated output 3a load 7v - 40v unregulated dc input + + feedback 4 2 1 3 5 +v in output 100 h l1 c out 1000 f c in 100 f gnd on/off d1 1n5822
revision 1, may 2002 www.gammamicro.com 3a step-down voltage regulators GM7130 preliminary 8 ordering information 0 3 1 7 m g e g a k c a p e g a t l o v t u p t u o . j d a v 3 . 3 v 0 . 5 v 2 1 v 5 1 5 - 3 6 2 - o t 5 a t a - 0 3 1 7 m g5 a t 3 . 3 - 0 3 1 7 m g5 a t 0 . 5 - 0 3 1 7 m g5 a t 2 1 - 0 3 1 7 m g5 a t 5 1 - 0 3 1 7 m g 5 - 0 2 2 - o t 5 b t a - 0 3 1 7 m g5 b t 3 . 3 - 0 3 1 7 m g5 b t 0 . 5 - 0 3 1 7 m g5 b t 2 1 - 0 3 1 7 m g5 b t 5 1 - 0 3 1 7 m g
revision 1, may 2002 www.gammamicro.com 3a step-down voltage regulators GM7130 preliminary 9 min max min max a 4.470 4.670 0.176 0.184 a1 2.520 2.820 0.099 0.111 b 0.710 0.910 0.028 0.036 c 0.310 0.530 0.012 0.021 c1 1.170 1.370 0.046 0.054 d 9.850 10.150 0.388 0.400 e 8.200 8.600 0.323 0.339 e1 11.760 12.160 0.463 0.479 e e1 6.700 6.900 0.264 0.272 f 2.590 2.890 0.102 0.114 l 13.500 13.900 0.531 0.547 3.790 3.890 0.149 0.153 symbol dimensions in millimeters dimensions in inches 1.700typ 0.067typ
revision 1, may 2002 www.gammamicro.com 3a step-down voltage regulators GM7130 preliminary 10 min max min max a 4.470 4.670 0.176 0.184 a1 0.000 0.150 0.000 0.006 b 1.560 1.760 0.061 0.069 b 0.710 0.910 0.028 0.036 c 0.310 0.530 0.012 0.021 c1 1.170 1.370 0.046 0.054 d 9.880 10.180 0.389 0.401 e 8.200 8.600 0.323 0.339 e e1 6.700 6.900 0.264 0.272 l 15.140 15.540 0.596 0.612 l1 5.080 5.480 0.200 0.216 l2 2.340 2.740 0.092 0.108 v 5.600ref 0.220ref symbol dimensions in millimet ers dimensions in inches 1.700typ 0.067typ
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