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cystech electronics corp. spec. no. : c513j3 issued date : 2007.12.19 revised date : 2010.07.22 page no. : 1/12 LM317J3 cystek product specification three terminal 1.5a adjustable output positive voltage regulators LM317J3 the LM317J3 is an adjustable 3?terminal positive voltage regulator capable of supplying in excess of 1.5a over an output voltage range of 1.3 v to 37 v. this voltage regulator is excep tionally 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 compensa tion, making it essentially blow?out proof. the LM317J3 serves a wide variety of applications incl uding local, on-card regulation. this device can also be used to make a programmable output regulator, or by connecting a fixe d resistor between the adjustment and output, the LM317J3 can be used as a precision current regulator. output current up to 1.5 a output voltage adjustable between 1.3 v and 37 v internal over te mperature protection internal short circuit protection safe?area compensation for output transistor pb-free package standard application + + pl317 r1 r2 cout cin vin vout package information to-252 pin function 1 adj 2 output 3 input 1.0 f 0.1 f cin is required if regulator is located an appreciate distance from power supply filter. cout is not needed for stability, however, it does improve transient response. v out= 1.25( 1+ r 2/ r 1 )+i adj r 2 since i adj is controlled to less than 100 a, the error associated with this term is negligible in most applications. i adj lm317 1 2 3
cystech electronics corp. spec. no. : c513j3 issued date : 2007.12.19 revised date : 2010.07.22 page no. : 2/12 LM317J3 cystek product specification maximum ratings (ta=25) parameter symbol ratings unit input-output voltage differential v i -v o 40 v power dissipation p d internally limited w operating junction temperature range t opr 0 ~ +125 storage temperature range tstg -65 ~ +150 electrical characteristics (t j =0 to 125 , v i -v o =5v, i o =0.5a, i max =1.5a, p max =20w, unless otherwise noted) characteristics symbol conditions min typ max unit t a =25 ,3.0v v i -v o 40v - 0.01 0.04 line regulation( note 1 ) v o(line) t a =0~125,3.0v v i -v o 40v - 0.02 0.07 %/v t a =25 v o 6v - 18 25 mv 10ma i o i max v o 5v - 0.4 0.5 %/v o v o 5v - 40 70 mv load regulation( note 1 ) v o(load) 10ma i o i max v o 6v - 0.8 1.5 %/v o adjust pin current i adj - 46 100 a adjust pin current change i adj 2.5v v i -v o 40v,10ma i o i max p d p max - 0.2 5.0 a reference voltage vref 3.0v v i -v o 40v,10ma i o i max p d p max 1.2 1.25 1.3 v temperature stability ts 0 t j 125 - 0.7 - %/v o minimum load current to maintain regulation i lmin v i -v o =40v - 3.5 10 ma maximum output current imax v i -v o 15v,p d p max v i -v o 15v,p d p max ,t a =25 1. 5 0.15 2.2 0.4 - - a rms noise vs % of v out en t a =25 ,10hz f 10khz - 0.003 0.01 %/v o v o =10v,f=120hz - 60 - ripple rejection( note 2 ) rr v o =10v,f=120hz, c adj =10 f 66 75 - db long-term stability( note 3) st t a =25 , 1000hrs - 0.3 1.0 % junction to case thermal resistance r jc - - 5 - /w notes: 1.load and line regulation are specified at co nstant junction temperature. changes in v o due to heating effects must be taken into account separately. pulse testing with low duty cycle is used. 2.c adj , when used, is connect ed between the adjustment pin and ground. 3.since long-term stability cannot be measured on each device before shipment, this specification is an engineering estimate of average stability from lot to lot. 4.power dissipation within an ic voltage regulator produces a temperature gradient on the die, affecting individual ic components on the die. these effects can be minimized by proper integrated circuit design and layout techniques. thermal regulation is the effect of thes e temperature gradients on the output voltage and is expressed in percentage of output change per watt of power change in a specified time.
cystech electronics corp. spec. no. : c513j3 issued date : 2007.12.19 revised date : 2010.07.22 page no. : 3/12 LM317J3 cystek product specification ordering information device package shipping marking LM317J3 to-252 (pb-free) 2500 pcs / tape & reel lm317 characteristic curves reference voltage vs temperature 1.235 1.24 1.245 1.25 1.255 1.26 -50 -25 0 25 50 75 100 125 temperature() reference voltage---vref(v) adjustment current vs temperature 35 40 45 50 55 60 -50 -25 0 25 50 75 100 125 temperature() adjustment current---iadj(a) dropout voltage vs input-output voltage difference 1 1.5 2 2.5 3 0 25 50 75 100 125 temperature() input-output voltage difference(v) vo=100ma il=1.5a il=1a il=500m a il=200ma il=20ma
cystech electronics corp. spec. no. : c513j3 issued date : 2007.12.19 revised date : 2010.07.22 page no. : 4/12 LM317J3 cystek product specification representative schematic diagram fig 1. line regulation and i adj /line test circuit pulse testing required 1% duty cycle is suggested Ov oh -v ol O line regulation(%/v)= 100 Ov ol O
cystech electronics corp. spec. no. : c513j3 issued date : 2007.12.19 revised date : 2010.07.22 page no. : 5/12 LM317J3 cystek product specification fig 2. load regulation and ? i adj /load test circuit fig 3. standard test circuit to calculate r2: vout=i set r2+1.250v assume i set =5.25ma pulse testing required. 1% duty cycle is suggested. vo(min load)-vo(max load) load regulation(mv)=vo(min load)-vo(max load) load regulation(%vo)= 100 vo(min load)
cystech electronics corp. spec. no. : c513j3 issued date : 2007.12.19 revised date : 2010.07.22 page no. : 6/12 LM317J3 cystek product specification application information basic circuit operation the lm317 is a 3-terminal floating regulator. in operation, the lm317 develops and maintains a nominal 1.25v reference (vref) between its output and adjustment term inals. this reference voltage is converted to a programming current (iprog) by r 1 (see fig 5), and this constant current flows through r 2 to ground. the regulated output vo ltage is given by: vout=vref ( 1+r 2 /r 1 )+i adj r 2 since the current from the adjustment terminal (i adj ) represents an error term in the equation, the lm317 was designed to control i adj to less than 100 a and keep it constant. to do this, all quiescent operating current is returned to the output terminal. this im poses the requirement for a minimum load current. if the load current is less than this mi nimum, the output voltage will rise. since the lm317 is a floating regulator, it is only the voltage differential acr oss the circuit which is important to performance, and operation at hi gh voltages with respect to ground is possible. fig 4. ripple rejection test circuit fig 5. basic circuit configuration
cystech electronics corp. spec. no. : c513j3 issued date : 2007.12.19 revised date : 2010.07.22 page no. : 7/12 LM317J3 cystek product specification load regulation the lm317 is capable of providing extremely good load regulation, but a few precautions are needed to obtain maximum performance. for best pe rformance, the programming resistor (r 1 ) should be connected as close to the regulator as possible to minimize line drops which effectively appear in series with the reference, thereby degrading regulation. the ground end of r 2 can be returned near the load ground to provide remote ground sensing a nd improve load regulation. external capacitors a 0.1 f disc or 1.0 f tantalum input bypass capacitor (cin) is recommended to reduce the sensitivity to input line impedance. the adjustment terminal may be bypassed to grou nd to improve ripple rejection. this capacitor (c adj ) prevents ripple from being amplified as the output voltage is increased. a 10 f capacitor should improve ripple rejection about 15 db at 120 hz in a 10v application. although the lm317 is stable with no output capacitance, like any feedb ack circuit, certain values of external capacitance can cause excessive ringing. an output capacitance (co) in the form of a 1.0 f tantalum or 25 f 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 some times necessary to add protection diodes to prevent the capacitors from dischargi ng through low current points into the regulator. fig 6 shows the lm317 with the recommended protecti on diodes for output voltages in excess of 25v or high capacitance values (co>25 f,c adj >10 f). diode d 1 prevents co from discharging thru the ic during an input short circuit. diode d 2 protects against capacitor c adj discharging through the ic during an output short circuit. the combination of diodes d 1 and d 2 prevents c adj from discharging through the ic during an input short circuit. fig 6. voltage regulator with protection diodes
cystech electronics corp. spec. no. : c513j3 issued date : 2007.12.19 revised date : 2010.07.22 page no. : 8/12 LM317J3 cystek product specification application circuits fig 7. ?laboratory? power supply with adju stable current limit and output voltage r1=vref/(iomax+i dss ) r2 vref/i dss vo < bv dss +1.25v+vss i lmin -i dss cystech electronics corp. spec. no. : c513j3 issued date : 2007.12.19 revised date : 2010.07.22 page no. : 9/12 LM317J3 cystek product specification fig 10. slow turn-on regulator fig 11. current regulator
cystech electronics corp. spec. no. : c513j3 issued date : 2007.12.19 revised date : 2010.07.22 page no. : 10/12 LM317J3 cystek product specification reel dimension carrier tape dimension
cystech electronics corp. spec. no. : c513j3 issued date : 2007.12.19 revised date : 2010.07.22 page no. : 11/12 LM317J3 cystek product specification recommended wave soldering condition product peak temperature soldering time pb-free devices 260 +0/-5 c 5 +1/-1 seconds recommended temperature profile for ir reflow profile feature sn-pb eutectic assembly pb-free assembly average ramp-up rate (tsmax to tp) 3 c/second max. 3 c/second max. preheat ? temperature min(t s min) ? temperature max(t s max) ? time(ts min to ts max ) 100 c 150 c 60-120 seconds 150 c 200 c 60-180 seconds time maintained above: ? temperature (t l ) ? time (t l ) 183 c 60-150 seconds 217 c 60-150 seconds peak temperature(t p ) 240 +0/-5 c 260 +0/-5 c time within 5 c of actual peak temperature(tp) 10-30 seconds 20-40 seconds ramp down rate 6 c/second max. 6 c/second max. time 25 c to peak temperature 6 minutes max. 8 minutes max. note : all temperatures refer to topside of t he package, measured on the package body surface.
cystech electronics corp. spec. no. : c513j3 issued date : 2007.12.19 revised date : 2010.07.22 page no. : 12/12 LM317J3 cystek product specification to-252 dimension *: typical inches millimeters b a c e h i j k 3 2 1 d f g l style: pin 1.adj 2.vout 3.vin 3-lead to-252 plastic surface mount package cystek package code: j3 marking: lm317 date code inches millimeters dim min. max. min. max. dim min. max. min. max. a 0.0177 0.0217 0.45 0.55 g 0.0866 0.1102 2.20 2.80 b 0.0650 0.0768 1.65 1.95 h - *0.0906 - *2.30 c 0.0354 0.0591 0.90 1.50 i - 0.0354 - 0.90 d 0.0177 0.0236 0.45 0.60 j - 0.0315 - 0.80 e 0.2520 0.2677 6.40 6.80 k 0.2047 0.2165 5.20 5.50 f 0.2125 0.2283 5.40 5.80 l 0.0551 0.0630 1.40 1.60 notes: 1.controlling dimension: millimeters. 2.maximum lead thickness includes lead finish thickness, and minimum lead thickness is the minimum thickness of base material. 3.if there is any question with packing specification or packing method, please c ontact your local cystek sales office. material: ? mold compound: epoxy resin family, flammability solid burning class: ul94v-0 important notice: ? all rights are reserved. reproduction in whole or in part is prohibited without the prior written approval of cystek. ? cystek reserves the right to make changes to its products without notice. ? cystek semiconductor products are not warranted to be suitable for use in life-support applications, or systems. ? cystek assumes no liability for any consequence of customer pr oduct design, infringement of pat ents, or application assistance .

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