1 gm317 3-terminal 1.5a adjustable regulator gm317 v1.05 gm317 v in v out v out v in adj i adj c in * 0.1 f c o ** 1 f r2 r1 240 * c in is required if regulator is located an appr eciable distance from power supply filter. **c o i s not needed for stability, however, it improve transient response. v out = 1.25v (1+ ) + i adj r2 r1 since i adj is controlled to less than 100a, the error associated with this term is negligible in most applications. description the gm317 is an adjustable 3-terminal positive voltage regulator capable of supplying in excess of 1.5 a over an output voltage range of 1.2 v to 37 v. this voltage regulator is exceptionally easy to use and requires only two external resistors to set the output voltage. further, it employs internal current limiting, thermal shutdown and safe area compensation, making it essentially blow out proof. gm317 offers full overload protection. included on the chip current limit, thermal overload protection, and safe-area protection. normally, no capacitors is needed unless the device is situated far from the input filter capacitors in which case an input bypass is needed. an optional output capacitor can added to improve transient response. features ? output current up to 1.5a ? output voltages 1.2v to 37v ? input regulation typ. 0.01% ? output regulation typ. 0.1% ? peak output current constant over temperature range of regulator ? available in to-220, to-263, to252 and sot223 packages ? ripple rejection typically 80db ? direct replacements for lm317 applications ? voltage regulators ? power supplies ? current regulators ? switching regulators ? current limiter ? constant current battery charger ? current limited charger typical application circuit r2
2 gm317 v1.05 gm317 3-terminal 1.5a adjustable regulator marking information and pin configurations (top view) to 252 (d-pak) to 220 to 263 (d 2 -pak) sot223 a: assembly / test site code y: year ww: week ordering information ordering number v out package shipping gm317ta3t to-263 50 units/tube gm317ta3r to-263 800 units / tape & reel GM317TB3T to-220 50 units/tube gm317tc3t to-252 80 units/tube gm317tc3r to-252 2,500 units / tape & reel gm317st3t sot-223 80 units/tube gm317st3r adj sot-223 2,500 units / tape & reel gm317 ayww gm317 ayww gm317 ayww gm317 ayww 1. adj 2. v out 3. v in 1. adj 2. v out 3. v in 1. adj 2. v out 3. v in 1. adj 2. v out 3. v in
3 gm317 3-terminal 1.5a adjustable regulator gm317 v1.05 absolute maximum ratings parameter ratings units input voltage, v i 41 v input to output differential voltage, v i ? v o 40 v continuous total dissipation at 25 c free-air temperature 2 continuous total dissipation at (or bellow) 25 c cast temperature 15 w operating junction temperature t j 0 to 125 c storage temperature t stg - 60 to 150 c lead temperature 1.6mm (1/6 inch) from case for 10 seconds 260 c recommended operating conditions parameter min max unit output current, i o 10 1500 ma operating virtual junction temperature, t j 0 125 c block diagram v out adj r1 310 r2 310 r3 190 r4 82 r5 5.6k r6 2 00 k r8 12.4k r9 190 d1 63v r7 130 r10 4.1k r11 5.8k r12 72 r13 5.1k c1 30pf c2 30pf r14 12k r15 2.4k r16 6.7k r17 12k r21 400 r19 370 r18 130 r22 160 r23 18k r24 160 d2 63v d3 63v r25 3 r26 0.1 v in 50 ? 6v c3 30pf
4 gm317 v1.05 gm317 3-terminal 1.5a adjustable regulator electrical characteristics ( unless otherwise noted, v i - v o = 5v and i o = 0.5a. t j = full range, unless otherwise noted) parameter symbol test condition min typ max unit 3v v in ? v out 40v, t j = 25c 0.01 0.04 line regulation (note 2) v oi 3v v in ? v out 40v, 0.02 0.07 %/v v out = 10v, f = 120hz 65 ripple rejection ratio v out = 10v, f = 120hz, 10 f capacitor between adj and gnd 66 80 db v o 5v 5 25 mv 10ma i out 1.5a, t j = 25c v o > 5v 0.1 0.5 % v o 5v 20 70 mv load regulation (note 3) v ol 10ma i out 1.2a v o > 5v 0.3 1.5 % output voltage change with temperature v ot full temperature range % long term stability (note 4) t j = 125 o c, v in ? v out = 40v, after 1000hr 0.3 1 % output noise voltage 10hz f 10khz, t j = 25c 0.003 % minimum load current v in ? v out 40v 3.5 10 ma v in ? v out 15v 1.5 2.2 output current limit i cl v in ? v out 40v , t j = 25c 0.15 0.4 a adjustment pin current i adj 50 100 a adjustment pin current change i adj 3v v in ? v out 40v 10ma i out 1.2a 0.2 5.0 a reference voltage 3v v in ? v out 40v, 10ma i out 1.5a, p 15w 1.2 1.25 1.3 v 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 mainta in 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 shipmen t, 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.
5 gm317 3-terminal 1.5a adjustable regulator gm317 v1.05 v in v out v ref r1 r2 i prog i adj gm317 adjust v ref = 1.25v typical basic circuit configuration v in v out gm317 adjust r1 r2 d2 1n4002 d1 1n4002 c o c adj c in application information ? basic circuit operation the gm317 is a 3- terminal floating regulator. in operat ion, the gm317 develops and maintains a nominal 1.25v reference (v ref ) between its output and adjustment terminals . this reference voltage is converted to a programming current flow 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 gm317was designed to control i adj to less than 100a and keep it constant. to do this, all quiescent operating current is returned to the output terminal. this imposes the requ irement for a minimum load current. if the load current is less than this minimum, t he 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 voltag es with respect to ground is possible. ? load regulation the gm317 is capable of providing extremely good load regulation, but a few precautions are needed to obtain maximum performance. for best performance, the progra mming resistor r1 should be connected as close to the regulator as possible to minimize line drops which effe ctively appear in series wi th the reference, thereby degrading regulation. the ground 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 capacitor c in is recommended to reduce the sensitivity to input line impedance. the adjustment terminal may be bypassed to gr ound to improve ripple rejection. this capacitor c adj prevents ripple from being amplified as the 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 ou tput capacitance, like any feedback ci rcuit, certain values of external capacitance can cause excessive ri nging. an output capacitance c o in the form of a 1.0f tantalum or 25f aluminum electrolytic capacitor on the output swamps this effect and insures stability. ? protection diodes when external capacitors are used with any ic regulator, it is sometimes necessary to add protection diodes to prevent the capacitors from discharging th rough low current points into the regulator. the figure below shows the gm317 with the recommended protection diodes for output for output voltage in excess of 25v or high capacitance values (c o > 25f, c adj > 10f). diode d1 prevents c o from discharging thru the ic during an input short circuit. diode d2 protects against capacitor c adj discharging through the ic during an output short circuit. the combi nation of diodes d1 and d2 prevents c adj from discharging through the ic during an input short circuit. v out = v ref (1 + r1 ) + i adj r2 r 2
6 gm317 v1.05 gm317 3-terminal 1.5a adjustable regulator t j , junction temperature (c) figure 1. load regulation v out , output voltage change (%) 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 i l = 0.5a i l = 1.5a v i = 15v v o = 10v -50 -25 0 25 50 75 100 125 150 v in ? v out , input ? output voltage differential (vdc) figure 2. current limit i out , output current (a) 4.0 3.0 1.0 0 t j = 25 ? c 0 10203040 150 ? c -55 ? c 2.0 ambient temperature (c) figure 3. adjustment pin current vs. temperature adjustment pin current ( a) 100 90 70 60 025 50 72 100 80 125 50 40 20 10 30 0 v in , - v out , input - output voltage differential (vdc) 3.0 2.5 1.0 i l = 1.5a 1a 1.5 500ma 200ma 20ma v out = 100mv 0 t j , junction temperature (c) figure 4. dropout voltage -50 -25 0 25 50 75 100 125 150 v in ? v out , input ? output voltage differential (vdc) figure 5. minimum operating current i b , quiescent current (ma) 5.0 4.5 3.5 3.0 010203040 4.0 2.5 2.0 0.5 1.5 0 t j = -55 ? c 150 ? c 25 ? c 1.0 rr, ripple rejection (db) 80 60 20 40 0 100 i l = 500ma v in = 15v v out = 10v t j = 25 ? c c load = 10f without c adj v in ? v out , input ? output voltage differential (vdc) figure 7. ripple rejection vs. frequency 100 1.0k 10k 100k 1.0m 10m 0 v out , output voltage figure 6. ripple rejection vs. output voltage 05.010 15 20 25 30 35 40 without c adj c adj = 10f v in ? v out = 5v i l = 500ma f = 120hz t j = 25 ? c rr, ripple rejection (db) 80 60 20 40 0 100 typical performance characteristics
7 gm317 3-terminal 1.5a adjustable regulator gm317 v1.05 package outline dimensions ? sot223 0.248 - 0.264 (6.30 - 6.71) 0.116 - 0.124 (2.95 - 3.15) nom 0.090 (2.29) 0.264 - 0.287 (6.71 - 7.29) 0.130 - 0.146 (3.30 - 3.71) 0.033 - 0.041 (0.84 - 1.04) nom 10 - 16 10 - 16 (0.31) 0.012 max 10 min 0.0008 - 0.0040 (0.0203 - 0.1016) 0.010 - 0.014 (0.25 - 0.36) 0.81 (4.6) 0.025 - 0.033 (0.64 - 0.84) nom max 0.071 (1.8) package outline dimensions ? to263 0.045 - 0.055 (1.143 - 1.397) 0.050 +/- 0.012 (1.270 +/- 0.305) 0.090 - 0.110 (2.286 - 2.794) 0.143 + 0.012 0.143 - 0.002 (3.632 + 0305) (3.362 - 0.508) 0.050 (1.270) 0.013 - 0.023 (0.330 - 0.584) typ 0.059 (1.499) 0.020 - 0.039 (0.510 - 0.990) 0.330 - 0.370 (8.382 - 9.398) 0.060 (1.524) typ 0.390 - 0.415 (9.906 - 10.541) typ 15 0.105 - 0.180 (4.191 - 4.572)
8 gm317 v1.05 gm317 3-terminal 1.5a adjustable regulator package outline dimensions ? to252 seating plan 0.370 ? 0.410 (9.400 ? 10.420) 0.205 ? 0.215 (5.210 ? 5.460) 0.210 ? 0.228 (5.330 ? 5.800) 0.055 ? 0.080 (1.400 ? 2.030) 0.018 ? 0.023 (0.460 ? 0.580) 0.030 ? 0.045 (0.760 ? 1.140) 0.180 (4.570) typ 0.090 (2.285) typ 0.045 ? 0.060 (1.150 ? 1.520) 0.039 ? 0.050 (1.020 ? 1.270) 0.018 ? 0.023 (0.460 ? 0.580) 0.020 (0.510) min
9 gm317 3-terminal 1.5a adjustable regulator gm317 v1.05 6 8 10 ordering number g m 317 ta3 t package type shipping type apm gamma micro circuit type ta3: to263 tb3: to220 tc3: to252 st3: sot223 t: tube r: t ape & reel note: pb-free products: ? rohs compliant and compatible with the cu rrent require-ments of ipc/jedec j-std-020. ? suitable for use in pb-free soldering processes with 100% matte tin (sn) plating. green products: ? lead-free (rohs compliant) ? halogen 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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