description the GM317 is an adjustable 3-terminal positive voltage reg- ulator capable of supplying in excess of 1.5 a over an out- put voltage range of 1.2 v to 37 v. this voltage regulator is exceptionally easy to use and requires only two external re-sistors to set the output voltage. further, it employs internal current limiting, thermal shutdown and safe area compen- sation, making it essentially blow-out proof. the GM317 a wide variety of applications including local, application, and on card regulation. this device can also be used to make a programmable output regulator, or by connecting a fixed resistor between the adjustment and out- put. the GM317 can be used as a precise current regula- tor. features output current up to 1.5a output voltages 1.2v to 37v input regulation typ. 0.01% per input output regulation typ. 0.1% peak output current constant over temperature range of regulator available in to-220 and t o-263 packages ripple rejection typically 80db direct replacements for lm317 g m 3 1 7 v 0 . 1 www.gammamicro.com 1 typical applica tion v in v out i adj r2 r1 240 w c* * o 1f c* in 0.1f v in v out adj GM317 * c is required if regulator is located an appreciable distance from power supply filter. in **c s not needed for stability, however , it improve transient response. o i since i is controlled to less than 100a, the error associated with this term is negligible adj in most applications. v = 1.25v (1+ ) + i r2 out adj r2 r1 + preliminary a a m i c r o e l e c t r o n i c s GM317 power management 3- terminal adjustable regulator
marking information & pin configura tions g m 3 1 7 2 a : assembly locat ion y : y ear w w : weekly package shipping to-220 50 / tube units GM317tb3t ordering number to-263 to-263 GM317ta3t GM317ta3r 50 units / t ube 800 / t ape & reel units ordering information GM317 ayww 2 to-263-2 (d pak) adj output input to-220 GM317 ayww adj output input * for detail ordering number identification, please see last page. a a m i c r o e l e c t r o n i c s GM317 power management 3- terminal adjustable regulator
g m 3 1 7 3 p ara met er v alu e unit 40 2 15 0 to + 125 -65 t o +15 0 260 input to o utput diff erent ial v oltag e, v - v io cont inuou s t otal d issipa tion a t 25 c fre e-air temp eratu re cont inuou s t otal d issipa tion a t (or bello w) 25 c ca se te mper ature oper ating free -air , cas e, or virtu al jun ction t empe ratur e ra nge stora ge t empe ratur e ran ge lead t empe ratur e 1.6 mm ( 1/16 inch) from case for 1 0 sec . absolute maximum ratings v w c p ara met er unit max min outp ut cu rrent , i o oper ating virtu al jun ction temp eratu re, t j recommended operating conditions ma c 1500 125 10 0 schematic diagram this device contains 29 active transistors. v in v out adj 6.3v 13k 6.3v 105 4.0 200 160 170 12k 510 6.8k 5pf 6.7k 2.4k 12.5k 30 pf 30 pf 5.1k 5.6k 120 230 310 31 125k 6.3v 190 135 12.4k 3.6k 5.8k 110 a a m i c r o e l e c t r o n i c s GM317 power management 3- terminal adjustable regulator
g m 3 1 7 4 electrical characteristics over recommended ranges of operating virtual junction temperature, unless otherwise noted. test conditions* min max unit parameter input regulation (note 2) peak output current output regulation ripple rejection %/ v a mv mv % % % % a a v % ma db 0.04 25 70 0.07 0.5 1.5 v - v = 3v to 40v io (note 3) i = 10ma to 1.5a o t = 25c (note 3) j t = min to max j i = 10ma to 1.5a o typ 0.01 2.2 5 20 65 0.02 0.4 0.1 0.3 1 0.003 50 0.2 1.25 1 10 80 v = 10v, f= 120h o v = 10v, f= 120h, o 10f capacitor between adj and ground 66 i = 10ma to 1.5a o (note 3) v5 v o v >5v o v5 v o v >5v o t = min to max j f= 10hz to 10khz, t = 25c j after 1000h at t = max and v - v = 40v ji o v - v = 40v io output voltage change with t emperature output noise voltage adjustment-t ermainal current adjustment-t ermainal current change reference voltage (output to adj) output voltage long-t erm drift (note 4) minimum output current to maintain regulation 0.3 3.5 100 5.0 1.3 v - v = 2.5v to 40v, io i = 10ma to 1.5a o v - v = 3v to 40v, io i = 10ma to 1.5a, p 15w o 1.2 v - v 15v io v - v 40v, t = 25c io j 1.5 0.15 * unless otherwise noted, these specifications apply for the following test conditions: v - v = 5v and i = 0.5a. io o for conditions shown as min or max, use the appropriate value specified under recommended operating conditions. note 1: all characteristics are measured with a 0.1f capacitor across the input and a 1f capacitor across the output. note 2: input regulation is expressed here as the percentage change in output voltage per 1v change at the input. note 3: pulse testing techniques are used to mantain the junction temperature as close to the ambient temperature as possible. thermal effects must be taken into account separately . note 4: since long-term drift cannot be measured on the individual devices prior to shipment, this specification is not intended to be a guarantee or warranty. it is an engineering estimate of the average drift to be expected from lot to lot. a a m i c r o e l e c t r o n i c s GM317 power management 3- terminal adjustable regulator
g m 3 1 7 5 typical performance characteristics 0.4 0.2 0 -0.2-0.4 -0.6 -0.8 -1.0 -50 -25 0 25 50 75 100 125 150 t , junction temperature (c) j d v , o u t p u t v o l t a g e c h a n g e ( % ) o u t figure 1. load regulation v = 15v in v = 10v out i = 0.5a l i = 1.5a l t = 25c j 4.0 3.02.0 1.0 0 0 10 20 30 40 v - v input - output in out, voltage differential(vdc) i , o u t p u t c u r r e n t ( a ) o u t figure 2. current limit 150c -55c 100 9080 70 60 50 40 30 20 10 0 0 25 50 72 100 125 ambient temperature (c) a d j u s t m e n t p i n c u r r e n t ( a ) figure 3. adjustment pin current vs. temperature 3.0 2.52.0 1.5 1.0 -50 -25 0 25 50 75 100 125 150 t , junction temperature (c) j figure 4. dropout voltage v - v , i n p u t - o u t p u t i n o u t v o l t a g e d i f f e r e n t i a l ( v d c ) 5.0 4.54.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0 10 20 30 40 i , q u i e s c e n t c u r r e n t ( m a ) b figure 5. minimum operating current v - v , input - output in out voltage differential (vdc) t = -55c j 25c 150c 100 8060 40 20 0 0 5.0 10 15 20 25 30 35 40 v , output voltage (v) out r r , r i p p l e r e j e c t i o n ( d b ) figure 6. ripple rejection versus output voltage c = 10a adj without c adj v - v = 5v in out i = 500ma l f= 120hz t = 25c j 100 8060 40 20 0 10 100 1.0k 10k 100k 1.0m 10m f, frequency (hz) figure 7. ripple rejection versus frequency r r , r i p p l e r e j e c t i o n ( d b ) d v = 100mv out i = 1.5a l 1.0a 500ma 200ma 20ma i = 500ma l v = 15v in v = 10v out t = 25c j c = 10f adj without c adj a a m i c r o e l e c t r o n i c s GM317 power management 3- terminal adjustable regulator
g m 3 1 7 6 application informa tion basic circuit operation the GM317 is a 3- terminal floating regulator. in opera- tion, the GM317 develops and maintains a nominal 1.25v reference (vref) between its output and adjust- ment terminals. this reference voltage is converted to a programming current flows through r2 to ground. the regulated output voltage is given by: since the current from the adjustment terminal (i ) adj represents an error term in the equation, the GM317 was designed to control i to less than 100a and adj keep it constant. t o do this, all quiescent operating cur- rent is returned to the output terminal. this imposes the requirement for a minimum load current. if the load current is less than this minimum, the output voltage will rise. since the GM317 is a floating regulator, it is only the voltage differential across the circuit which is important to performance, and operation at high voltages with re- spect to ground is possible. vref= 1.25v t ypical figure 8. basic circuit configurationload regulation the GM317 is capable of providing extremely good load regulation, but a few precautions are needed to ob-tain maximum performance. for best performance, the programming resistor (r1) should be connected as close to the regulator as possible to minimize line drops which effectively appear in series with the refer- ence, thereby degrading regulation. the groung end of r2 can be returned near the load ground to provide re- mote ground sensing and improve load regulation. external capacitors a 0.1f disc or 1.0f tantalum input bypass capaci- tor (c ) is recommended to reduce the sensitivity to in input line impedance. the adjustment terminal may be bypassed to ground to improve ripple rejection. this capacitor (c ) prevents ripple from being amplified as the adj output voltage is increased. a 10f capacitor should improve ripple rejection about 15 db at 120hz in a 10v application. although the GM317 is stable with no output capaci- tance, like any feedback circuit, certain values of ex-ternal capacitance can cause excessive ringing. an output capacitance (c ) in the form of a 1.0f tanta- o lum or 25f aluminum electrolytic capacitor on the output swamps this effect and insures stability. protection diodes when external capacitors are used with any ic regu- lator it is sometimes necessary to add protection di-odes to prevent the capacitors from discharging through low current points into the regulator. figure 9. shows the GM317 with the recommended protection diodes for output for output voltage in ex-cess of 25vor high capacitance values (c > 25f , o c > 10f). diode d1 prevents c from discharg- adj o ing thru the ic during an input short circuit. diode d2 protects against capacitor c discharging through adj the ic during an output short circuit. the combination of diodes d1 and d2 prevents c from discharging through the ic during an in- adj put short circuit. figure 9. voltage regulator with protection diodes GM317 v in v out v out v out r1 r2 i prog adjust i adj vref v = vref (1+ ) + i r2 out adj r2 r1 v in v out d1 r1 r2 adjust d2 1n4002 + c o 1n4002 GM317 c adj c in a a m i c r o e l e c t r o n i c s GM317 power management 3- terminal adjustable regulator
g m 3 1 7 7 p p to-263-2 p ackage outline dimensions pad layout 9.90 0.20 15 0.40 1.50 dp0.20 9.20 0.20 4.90 0.20 15.3 0.20 1.27 0.10 0.90 0.10 2.54 typ (2.54 0.20) 1.4 0.20 3 4.50 0.20 1.30 +0.1 -0.05 0.10 0.01 2.40 0.20 2.00 0.10 r0.30 r0.30 2.54 0.10 0.50 +0.1 -0.05 4.0 7.0 10.0 0.20 0.40 0.90 7.2 9.20 0.20 4.90 0.20 unit: mm 10.00 0.20 3 3 0.33 8.38 0.63 17.02 0.12 3.05 0.04 1.016 0.24 6.096 0.42 10.66 inches mm ( ) 1.20 r 0.45 0.75 3 3 r 0.3 to-220-3 p ackage outline dimensions 9.90 0.20 3.60 0.20 1.50 dp0.20 1 3 . 0 8 0 . 2 0 9 . 2 0 0 . 2 0 3.70 0.20 1.30 2.80 0.10 1 5 . 9 0 0 . 2 0 1 8 . 9 5 m a x 1 0 . 0 8 0 . 3 0 1.52 0.10 0.80 0.10 2.54 typ (2.54 0.20) 0.50 2.40 0.20 unit: mm 1.30 0.10 4.50 0.20 8.70 1.70 4.60 1.46 1.00 3.00 45 +0.1 -0.05 3 3 3 +0.1 -0.05 8.0 7.0 7.0 0.9 3-r0.2 10.00 0.20 3 3 8.40 1.27 0.10 2 - r 0.3 a a m i c r o e l e c t r o n i c s GM317 power management 3- terminal adjustable regulator
g m 3 1 7 8 ordering number gm 317 ta 3 t gamma micro. circuit type package ta3: t o-263 tb3: to-220 shipping r: t ape & reel t : tube a a m i c r o e l e c t r o n i c s GM317 power management 3- terminal adjustable regulator
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