1 gm317l 3-terminal 100ma adjustable regulator gm317l v2.01 gm317l 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 gm317l is an adjustable 3-terminal positive voltage regulator capable of supplying 100ma 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. gm317l 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 100ma ? output voltages 1.2v to 37v ? internal thermal overload protection ? internal short circuit current limiting ? output transistor safe area compensation ? floating operation for high voltage applications ? available in to-92 and so8 packages applications ? voltage regulators ? power supplies ? current regulators ? switching regulators ? current limiter ? constant current battery charger ? current limited charger typical application circuit l r2
2 gm317l v 2.01 gm317l 3-terminal 100ma adjustable regulator marking information and pin configurations (top view) to 92 so 8 g: green product a: assembly / test site code y: year ww: week ordering information ordering number v out package shipping GM317LT92BG to 92 1,000 units/esd bag gm317lt92rlg to 92 2,000 units/ammo pack (tape) gm317ls8rg adj so 8 2500 units / reel 317lg ayww 2 v out 3 v in adj 1 1. v in 2. v out 8. nc 7. v ou t 4. adj 5. nc 6. v ou t gm317lg vayww 3. v out
3 gm317l 3-terminal 100ma adjustable regulator gm317l v2.01 absolute maximum ratings parameter ratings units input voltage, v i 41 v input to output differential voltage, v i ? v o 40 v 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 10 100 ma operating virtual junction temperature, t j 0 125 c block diagram r20 300k q1 q21 q20a q20b q20c q20d q20e q2 c3 20 p f q3 r2 500 r1 200 q22 q23 r3 3.7k q24 q25 r18 30k r22 1.0k q5 q6 c1 30 p f c2 15 p f q9 q10 r4 2.4k r5 12k r23 60 a dj r27 2k q26 q7 r24 5k q4 q12 q14 r25 4.7k q8 c5 6 p f r9 300 r7 6.57k r8 300 r6 370 q11a q11b q14b r19 12k q15 q17 q16 q18 6.2v q19 6.2v r11 60 r28 10 r26 0.3 r15 60k r21 8k r10 600 r12 0.3 in out
4 gm317l v 2.01 gm317l 3-terminal 100ma adjustable regulator electrical characteristics ( unless otherwise noted, v i - v o = 5v and i o = 40ma. t j = 0c to 125c, unless otherwise noted) parameter symbol test condition min typ max unit 3v v in ? v out 40v, t a = 25c 0.01 0.04 line regulation (note 2) v oi 3v v in ? v out 40v, 0.02 0.07 %/v v o 5v 5 25 mv 10ma i out 100ma, t a = 25c v o > 5v 0.1 0.5 %/ v o v o 5v 20 70 mv load regulation v ol 10ma i out 100ma v o > 5v 0.3 1.5 %/ v o adjustment pin current i adj 50 100 a adjustment pin current change i adj 3v v in ? v out 40v 10ma i out 100ma 0.2 5.0 a reference voltage 3v v in ? v out 40v, 10ma i out 100ma, 1.2 1.25 1.3 v minimum load current v in ? v out 40v 3.5 10 ma v in ? v out 40v, t a = 25c 25 50 maximum output current i o(max) v in ? v out 15v 100 200 ma v out = 10v, f = 120hz 65 ripple rejection ratio v out = 10v, f = 120hz, 10 f capacitor between adj and gnd 66 80 db long term stability (note 3) t a = 125 o c, 1000hr 0.3 % output noise voltage 10hz f 10khz, t a = 25c 0.003 % 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: 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 gm317l 3-terminal 100ma adjustable regulator gm317l v2.01 v in v out v ref r1 r2 i prog i adj gm317l adjust v ref = 1.25v typical basic circuit configuration v in v out gm317l adjust r1 r2 d2 1n4002 d1 1n4002 c o c adj c in application information ? basic circuit operation the gm317l is a 3- terminal floating regulator. in oper ation, tit develops and maintains a nominal 1.25v reference (v ref ) between its output and adjustment terminal. 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 gm317lwas designed to minimize i adj and make it very constant with line and load changes. to do this, all quiescent operating current is returned to the output establishi ng a minimum load current requirement. if there is insufficient load on the output, the output will rise. since the gm317l is a floating regulator, it is only the voltage differential acro ss the circuit which is important to performance, and operation at high voltag es with respect to ground is possible. ? load regulation the gm317l is capable of providing extremely good load r egulation, 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 gm317l 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 gm317l with the recommended protection diodes for out put 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 r2
6 gm317l v 2.01 gm317l 3-terminal 100ma adjustable regulator package outline dimensions ? to 92 2.10 - 2.27 4.7 - 5.2 0.4 - 0.55 typ. 3.85 - 4.19 12.7 - 14.2 1.22 - 1.32 4.9 - 5.2 package outline dimensions ? so 8 (0.356 - 0.508) (0.406 - 0.270) 0.016 - 0.050 d 0.189 - 0.197 (4.800 - 5.004) seating plan 0.014 - 0.020 0.150 - 0.157 (3.810 - 3.988) 0.008 - 0.010 (0.203 - 0.254) 8.0 max 0.053 - 0.059 (1.346 - 1.753) 0.004 - 0.010 0.228 - 0.244 (5.791 - 6.198) 0.050 (1.270) typ (0.012 - 0.254) dimensions are in millimeters
7 gm317l 3-terminal 100ma adjustable regulator gm317l v2.01 6 8 10 ordering number g m 317l t92 b g package type shipping type a pm gamma micro circuit type t92: to92 s8: so8 b: bag rl: ammo pack ( t ape) t: tube r: t ape & reel g:green 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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