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r1171x series 2.0a/1.5a ldo regulator no. ea-125-111027 1 outline the r1171x series are cmos-based positive voltage regulator ics. the r1171x series have features of low dropout voltage, high output voltage accuracy, low consum ption current. each of these ics consists of a voltage reference unit, an error amplifier, resistor net for setti ng output voltage, a current limit circuit at short mode, a chip enable circuit, and thermal shutdown circuit. the output voltage of r1171 is fixed in the ic. low consumption current by the merit of cmos process and built-in transi stors with low on-resistance make low dropout voltage and chip enable function prolongs t he battery life. these regulators are remarkable improvement on the current regulators in terms of i nput transient response, and load transient response. thus, the r1171x series are suitable for various power sources. since the packages for these ics are high wattage hs op-6j package, to-252-5-p1, high density mounting of the ics on boards is possible. features ? supply curre nt ............................................................. typ. 130 a ? standby current ........................................................... typ. 0.1 a ? output current ............................................................. min. 1.5a (v in = v out + 1.0v, r1171sxx1a/b) min. 2.0a (v in = v out + 1.0v, r1171jxx1c/d) ? input voltage ................................................................ 2.1v to 6.0v ? output voltage ............................................................. 1. 5v to 5.0v (0.1v steps) (r1171sxx1a/b) 1.8v to 5.0v (0.1v steps) (r1171jxx1c/d) ( for other voltages, please refer to mark informations.) ? output voltage accuracy.............................................. 2.0% ? dropout voltage ........................................................... typ. 0.09v (v out = 3.0v, i out = 300ma) ? temperature-drift coefficient of output voltage........... typ. 100ppm/ c ? line regulation ............................................................ typ. 0.05%/v ? packages ..................................................................... hsop-6 j, to-252-5-p1 ? built-in current limit circuit ? built-in thermal shutdown circuit ? ceramic capacitor for phase compensation ................ c in = c out = ceramic 10 f (v out <1.8v) c in = c out = ceramic 4.7 f (v out > = 1.8v) applications ? local power source for notebook pc. ? local power source for portable appliances, cameras, and videos. ? local power source for equipment of battery-use. ? local power source for home appliances.
r1171x 2 block diagrams r1171xxx1a/c r1171xxx1b/d v dd gnd v out ce vref current limit thermal shutdown gnd v dd gnd v out ce vref current limit thermal shutdown gnd selection guide the output voltage, chip enable polarity, package for the ics can be selected at the user?s request. product name package quantity per reel pb free halogen free r1171sxx1 ? -e2-fe hsop-6j 1,000 pcs yes yes r1171jyy1$-t1-f to-252-5-p1 3,000 pcs yes no xx : the output voltage can be designated in the rang e from 1.5v(15) to 5.0v(50) in 0.1v steps. (for other voltages, please refer to mark informations.) yy : the output voltage can be designated in the rang e from 1.8v(18) to 5.0v(50) in 0.1v steps. (for other voltages, please refer to mark informations.) ? : ce pin polarity are options as follows. (a) "l" active (b) "h" active $ : ce pin polarity are options as follows. (c) "l" active (d) "h" active
r1171x 3 pin configurations z hsop-6j z to-252-5-p1 13 64 2 5 12345 pin descriptions x hsop-6j pin no symbol pin description 1 v out output pin 2 gnd ground pin 3 ce or ce chip enable pin 4 nc no connection 5 gnd ground pin 6 v dd input pin x to-252-5-p1 pin no symbol pin description 1 v out output pin 2 ce or ce chip enable pin 3 gnd ground pin 4 gnd ground pin 5 v dd input pin ) no.3 and no.4 pins must be wired short each other and connected to the gnd plane when it is mounted on board.
r1171x 4 absolute maximum ratings symbol item rating unit v in input voltage 7.0 v v ce input voltage ( ce or ce input pin) ? 0.3 to v in + 0.3 v v out output voltage ? 0.3 to v in + 0.3 v power dissipation (hsop-6j) ? 1 1700 p d power dissipation (to-252-5-p1) ? 1 1900 mw topt operating temperature ? 40 to 85 c tstg storage temperature ? 55 to 125 c ? ) for power dissipation, please refer to package information. absolute maximum ratings electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the permanent damages and may degrade the life time and safety for both device and sy stem using the device in the field. the functional operation at or over these absolute maximum ratings is not assured. recommended operating conditions (electrical characteristics) all of electronic equipment should be designed that the mounted semiconductor devices operate within the recommended operating conditions. the semiconductor devices cannot operate normally over the recommended operating conditions, even if when they are used over such conditions by momentary electronic noise or surge. and the semiconductor de vices may receive serious damage when they continue to operate over the recommended operating conditions.
r1171x 5 electrical characteristics ? r1171sxx1a topt = 25 c symbol item conditions min. typ. max. unit v out output voltage v in ? v out = 1.0v, i out = 200ma 0.98 1.02 v v out / i out load regulation v in ? v out = 1.0v 1ma < = < = < = < = < = < = < = = 300ma 2.5 < = < = ? v out = 1.0v, v ce = 0v 130 320 a i standby standby current v in ? v out = 1.0v, v in = v ce 0.1 2.0 a v out / v in line regulation i out = 200ma rr ripple rejection f = 1khz, ripple 0.5vp-p refer to the following table v in input voltage 2.1 6.0 v v out / t opt output voltage temperature coefficient i out = 10ma ? 40 c < = < = c 100 ppm/ c i lim output current v in ? v out = 1.0v 1.5 a i sc short current limit v out = 0v 200 ma r pu pull-up resistance for ce pin 2.5 5.0 10.0 m v ceh ce input voltage "h" 1.2 v in v v cel ce input voltage "l" 0 0.25 v t tsd thermal shutdown detector threshold temperature junction temperature 150 c t tsr thermal shutdown released temperature junction temperature 120 c ? line regulation by output voltage topt = 25 c line regulation v out / v in (%/v) output voltage v out (v) condition typ. max. 1.5 < = v out < 1.6 i out = 200ma, 2.1v < = < = < = v out < = 5.0 i out = 200ma, v out + 0.5v < = < = ? ripple rejection by output voltage topt = 25 c ripple rejection rr (db) output voltage v out (v) condition typ. 1.5 < = v out < 4.7 f = 1khz, ripple 0.5vp-p, v in ? v out = 1.0v 4.7 < = v out < = 5.0 f = 1khz, ripple 0.5vp-p, v in = 5.75v 50
r1171x 6 ? r1171sxx1b topt = 25 c symbol item conditions min. typ. max. unit v out reference voltage for adjustable voltage regulator v in ? v out = 1.0v i out = 200ma 0.98 1.02 v v out / i out load regulation v in ? v out = 1.0v 1ma < = < = < = < = < = < = < = = 300ma 2.5 < = < = ? v out = 1.0v, v ce = v in 130 320 a i standby standby current v in ? v out = 1.0v, v ce = 0v 0.1 2.0 a v out / v in line regulation i out = 200ma rr ripple rejection f = 1khz, ripple 0.5vp-p refer to the following table v in input voltage 2.1 6.0 v v out / t opt output voltage temperature coefficient i out = 10ma ? 40 c < = < = c 100 ppm/ c i lim output current v in ? v out = 1.0v 1.5 a i sc short current limit v out = 0v 200 ma r pd pull-down resistance for ce pin 2.5 5.0 10.0 m v ceh ce input voltage "h" 1.2 v in v v cel ce input voltage "l" 0 0.25 v t tsd thermal shutdown detector threshold temperature junction temperature 150 c t tsr thermal shutdown released temperature junction temperature 120 c ? line regulation by output voltage topt = 25 c line regulation v out / v in (%/v) output voltage v out (v) condition typ. max. 1.5 < = v out < 1.6 i out = 200ma, 2.1v < = < = < = v out < = 5.0 i out = 200ma, v out + 0.5v < = < = ? ripple rejection by output voltage topt = 25 c ripple rejection rr (db) output voltage v out (v) condition typ. 1.5 < = v out < 4.7 f = 1khz, ripple 0.5vp-p, v in ? v out = 1.0v 4.7 < = v out < = 5.0 f = 1khz, ripple 0.5vp-p, v in = 5.75v 50
r1171x 7 ? r1171jxx1c topt = 25 c symbol item conditions min. typ. max. unit v out output voltage v in ? v out = 1.0v i out = 200ma 0.98 1.02 v v out / i out load regulation v in ? v out = 1.0v 1ma < = < = < = < = = 300ma 2.5 < = < = ? v out = 1.0v, v ce = 0v 130 320 a i standby standby current v in ? v out = 1.0v, v in = v ce 0.1 2.0 a v out / v in line regulation i out = 200ma v out + 0.5v < = < = = 1khz, ripple 0.5vp-p refer to the following table v in input voltage 2.1 6.0 v v out / t opt output voltage temperature coefficient i out = 10ma ? 40 c < = < = c 100 ppm/ c i lim output current v in ? v out = 1.0v 2.0 a i sc short current limit v out = 0v 200 ma r pu pull-up resistance for ce pin 2.5 5.0 10.0 m v ceh ce input voltage "h" 1.2 v in v v cel ce input voltage "l" 0 0.25 v t tsd thermal shutdown detector threshold temperature junction temperature 150 c t tsr thermal shutdown released temperature junction temperature 120 c ? ripple rejection by output voltage topt = 25 c ripple rejection rr (db) output voltage v out (v) condition typ. 1.8 < = v out < 4.7 f = 1khz, ripple 0.5vp-p, v in ? v out = 1.0v 4.7 < = v out < = 5.0 f = 1khz, ripple 0.5vp-p, v in = 5.75v 50
r1171x 8 ? r1171jxx1d topt = 25 c symbol item conditions min. typ. max. unit v out reference voltage for adjustable voltage regulator v in ? v out = 1.0v i out = 200ma 0.98 1.02 v v out / i out load regulation v in ? v out = 1.0v 1ma < = < = < = < = = 300ma 2.5 < = < = ? v out = 1.0v, v ce = v in 130 320 a i standby standby current v in ? v out = 1.0v, v ce = 0v 0.1 2.0 a v out / v in line regulation i out = 200ma v out + 0.5v < = < = = 1khz, ripple 0.5vp-p refer to the following table v in input voltage 2.1 6.0 v v out / t opt output voltage temperature coefficient i out = 10ma ? 40 c < = < = c 100 ppm/ c i lim output current v in ? v out = 1.0v 2.0 a i sc short current limit v out = 0v 200 ma r pd pull-down resistance for ce pin 2.5 5.0 10.0 m v ceh ce input voltage "h" 1.2 v in v v cel ce input voltage "l" 0 0.25 v t tsd thermal shutdown detector threshold temperature junction temperature 150 c t tsr thermal shutdown released temperature junction temperature 120 c ? ripple rejection by output voltage topt = 25 c ripple rejection rr (db) output voltage v out (v) condition typ. 1.8 < = v out < 4.7 f = 1khz, ripple 0.5vp-p, v in ? v out = 1.0v 4.7 < = v out < = 5.0 f = 1khz, ripple 0.5vp-p, v in = 5.75v 50
r1171x 9 test circuits i out in v dd v out ce gnd c out c in out r1171xxx1b series i ss in v dd v out ce gnd c out c in out r1171xxx1b series standard test circuit supply current test circuit i out in v dd v out ce gnd c out out r1171xxx1b series p. g. in v dd v out ce gnd c out c in out r1171xxx1b series i 1 i 2 test circuit for ripple rejection, test circuit for load transient response input transient response
r1171x 10 typical characteristics 1) output voltage vs. output current (topt=25 c) r1171s151x r1171s201x 0 2500 3000 1500 2000 1000500 3500 output current i out (ma) 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.8 1.6 output voltage v out (v) v in =2.5v v in =2.0v v in =3.5v 0 2500 3000 1500 2000 1000500 3500 output current i out (ma) 0 0.5 1.0 1.5 2.0 2.5 output voltage v out (v) v in =2.5v v in =4.0v v in =3.0v r1171s301x r1171s501x 0 2500 3000 1500 2000 1000500 3500 output current i out (ma) 0 0.5 1.0 1.5 2.0 2.5 3.5 3.0 output voltage v out (v) v in =4.0v v in =3.5v v in =5.0v 0 2500 3000 1500 2000 1000500 3500 output current i out (ma) 0 1 2 3 4 5 6 output voltage v out (v) v in =5.5v v in =6.0v r1171j181x r1171j501x 0 2500 3000 1500 2000 1000500 3500 output current i out (ma) output voltage v out (v) v in =2.3v v in =2.8v v in =3.8v 0 2.0 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 0.2 0 2500 3000 1500 2000 1000500 3500 output current i out (ma) 0 1 2 3 4 5 6 output voltage v out (v) v in =5.5v v in =6.0v
r1171x 11 2) output voltage vs. input voltage (topt = 25c) r1171x151b r1171x201b i out =1ma i out =10ma i out =100ma i out =300ma i out =500ma 14 5 3 26 input voltage v in (v) 1.2 1.3 1.4 1.5 1.6 1.7 1.8 output voltage v out (v) i out =1ma i out =10ma i out =100ma i out =300ma i out =500ma 14 5 3 26 input voltage v in (v) 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 output voltage v out (v) r1171x301b r1171x501b i out =1ma i out =10ma i out =100ma i out =300ma i out =500ma 245 36 input voltage v in (v) 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 output voltage v out (v) i out =1ma i out =10ma i out =300ma i out =500ma 4.0 5.5 5.0 4.5 6.0 input voltage v in (v) 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 output voltage v out (v) 3) dropout voltage vs. output current r1171s151x r1171s201x 0 1250 250 750 1000 500 1500 0 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 output current i out (ma) dropout voltage v dif (v) 85 c 25 c -40 c 0 1250 250 750 1000 500 1500 0 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 output current i out (ma) dropout voltage v dif (v) 85 c 25 c -40 c
r1171x 12 r1171s301x r1171s501x 0 1250 250 750 1000 500 1500 0 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 output current i out (ma) dropout voltage v dif (v) 85 c 25 c -40 c 0 1250 250 750 1000 500 1500 0 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 output current i out (ma) dropout voltage v dif (v) 85 c 25 c -40 c r1171j181x r1171j201x 0 175015001250 250 750 1000 500 2000 0 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 output current i out (ma) dropout voltage v dif (v) 85 c 25 c -40 c 0 175015001250 250 750 1000 500 2000 0 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 85 c 25 c -40 c output current i out (ma) dropout voltage v dif (v) r1171j301x r1171j501x 0 175015001250 250 750 1000 500 2000 0 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 85 c 25 c -40 c output current i out (ma) dropout voltage v dif (v) 0 175015001250 250 750 1000 500 2000 0 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 85 c 25 c -40 c output current i out (ma) dropout voltage v dif (v)
r1171x 13 4) output voltage vs. temperature r1171x151b r1171x201b -50 75 -25 25 50 0 100 1.40 1.60 1.55 1.50 1.45 temperature topt(c) output voltage v out (v) v in =2.5v, i out =200ma -50 75 -25 25 50 0 100 1.90 2.10 2.05 2.00 1.95 temperature topt(c) output voltage v out (v) v in =3.0v, i out =200ma r1171x301b r1171x501b -50 75 -25 25 50 0 100 2.80 3.20 3.10 3.00 3.15 3.05 2.90 2.85 2.95 temperature topt(c) output voltage v out (v) v in =4.0v, i out =200ma -50 75 -25 25 50 0 100 4.80 5.20 5.10 5.00 5.15 5.05 4.90 4.85 4.95 temperature topt(c) output voltage v out (v) v in =5.0v, i out =200ma 5) supply current vs. input voltage (topt = 25c) r1171x151b r1171x201b 01 45 3 26 input voltage v in (v) 0 100 50 150 200 250 300 350 supply current i ss (a) 01 45 3 26 input voltage v in (v) 0 100 50 150 200 250 300 350 supply current i ss (a)
r1171x 14 r1171x301b r1171x501b 01 45 3 26 input voltage v in (v) 0 100 50 150 200 250 300 350 supply current i ss (a) 01 45 3 26 input voltage v in (v) 0 100 50 150 200 250 300 350 supply current i ss (a) 6) supply current vs. temperature r1171x151b r1171x201b v in =2.5v -50 -25 50 75 250 100 temperature topt(c) 0 100 50 150 200 250 300 350 supply current i ss (a) v in =3.0v -50 -25 50 75 250 100 temperature topt(c) 0 100 50 150 200 250 300 350 supply current i ss (a) r1171x301b r1171x501b v in =4.0v -50 -25 50 75 250 100 temperature topt(c) 0 100 50 150 200 250 300 350 supply current i ss (a) v in =6.0v -50 -25 50 75 250 100 temperature topt(c) 0 100 50 150 200 250 300 350 supply current i ss (a)
r1171x 15 7) dropout voltage vs. set output voltage (topt = 25 c) r1171sxx1x r1171jxx1x i out =1500ma i out =1000ma i out =600ma i out =200ma 14 3 25 set output voltage v set (v) 0 0.3 0.2 0.1 0.4 0.5 0.6 0.7 0.8 dropout voltage v dif (v) i out =2000ma i out =1000ma i out =400ma i out =200ma 14 3 25 set output voltage v set (v) 0 0.3 0.2 0.1 0.4 0.5 0.6 0.7 0.8 dropout voltage v dif (v) 8) ripple rejection vs. frequency r1171x151b r1171x201b i out =1ma i out =10ma i out =100ma i out =200ma i out =500ma 0.1 10.0 1.0 100.0 0 80 60 70 40 50 20 30 10 ripple frequency f(khz) ripple rejection rr(db) v in =2.5v+0.5vp-p i out =1ma i out =10ma i out =100ma i out =200ma i out =500ma 0.1 10.0 1.0 100.0 0 80 60 70 40 50 20 30 10 ripple frequency f(khz) ripple rejection rr(db) v in =3.0v+0.5vp-p r1171x301b r1171x501b i out =1ma i out =10ma i out =100ma i out =200ma i out =500ma 0.1 10.0 1.0 100.0 0 80 60 70 40 50 20 30 10 ripple frequency f(khz) ripple rejection rr(db) v in =4.0v+0.5vp-p i out =1ma i out =10ma i out =100ma i out =200ma i out =500ma 0.1 10.0 1.0 100.0 0 80 60 70 40 50 20 30 10 ripple frequency f(khz) ripple rejection rr(db) v in =5.75v+0.5vp-p
r1171x 16 9) ripple rejection vs. input voltage r1171x301x r1171x301x 3.1 3.4 3.3 3.2 3.5 0 80 60 70 40 50 20 30 10 input voltage v in (v) ripple rejection rr(db) i out =1ma,c out =4.7f f=400hz f=1khz f=10khz 3.1 3.4 3.3 3.2 3.5 0 80 60 70 40 50 20 30 10 input voltage v in (v) ripple rejection rr(db) i out =10ma,c out =4.7f f=400hz f=1khz f=10khz r1171x301x r1171x301x 3.1 3.4 3.3 3.2 3.5 0 80 60 70 40 50 20 30 10 input voltage v in (v) ripple rejection rr(db) i out =100ma,c out =4.7f f=400hz f=1khz f=10khz 3.1 3.4 3.3 3.2 3.5 0 80 60 70 40 50 20 30 10 input voltage v in (v) ripple rejection rr(db) i out =300ma,c out =4.7f f=400hz f=1khz f=10khz r1171x301x 3.1 3.4 3.3 3.2 3.5 0 80 60 70 40 50 20 30 10 input voltage v in (v) ripple rejection rr(db) i out =500ma,c out =4.7f f=400hz f=1khz f=10khz
r1171x 17 10) input transient response (topt = 25 c) r1171x151b 08 0 604020 180 160 140 120 100 200 time t(s) output voltage v out (v) input voltage v in (v) 1.40 1.50 1.45 1.55 1.60 1.65 1.75 1.70 1.80 0 1.0 0.5 1.5 2.0 2.5 3.5 3.0 4.0 input voltage output voltage tr=tf=5 s, i out =1000ma, c out =ceramic 10 f r1171x201b 08 0 604020 180 160 140 120 100 200 time t(s) output voltage v out (v) input voltage v in (v) 1.90 2.00 1.95 2.05 2.10 2.15 2.25 2.20 2.30 0.5 1.5 1.0 2.0 2.5 3.0 4.0 3.5 4.5 input voltage output voltage tr=tf=5 s, i out =1000ma, c out =ceramic 4.7 f r1171x301b 08 0 604020 180 160 140 120 100 200 time t(s) output voltage v out (v) input voltage v in (v) 2.90 2.95 3.00 3.05 3.15 3.10 3.20 1.0 1.5 2.5 2.0 3.0 3.5 4.0 5.0 4.5 5.5 input voltage output voltage tr=tf=5 s, i out =1000ma, c out =ceramic 4.7 f
r1171x 18 r1171x501b 08 0 604020 180 160 140 120 100 200 time t(s) output voltage v out (v) input voltage v in (v) 4.90 5.00 4.95 5.05 5.10 5.15 5.25 5.20 5.30 3.5 4.5 4.0 5.0 5.5 6.0 7.0 6.5 7.5 input voltage output voltage tr=tf=5 s, i out =1000ma, c out =ceramic 4.7 f 11) load transient response (topt = 25 c) r1171x151b 08 0 604020 180 160 140 120 100 200 time t(s) output voltage v out (v) output current i out (ma) 1.35 1.55 1.50 1.45 1.40 1.60 1.65 1.70 1.80 1.75 1.85 0 1500 500 1000 2000 output current output voltage tr=tf=10 s, v in =2.5v, c out =ceramic 10 f r1171x201b 08 0 604020 180 160 140 120 100 200 time t(s) output voltage v out (v) output current i out (ma) 1.85 2.05 2.00 1.95 1.90 2.10 2.15 2.20 2.30 2.25 2.35 0 1500 500 1000 2000 output current output voltage tr=tf=10 s, v in =3.0v, c out =ceramic 4.7 f
r1171x 19 r1171x301b 08 0 604020 180 160 140 120 100 200 time t(s) output voltage v out (v) output current i out (ma) 2.85 3.05 3.00 2.95 2.90 3.10 3.15 3.20 3.30 3.25 3.35 0 1500 500 1000 2000 output current output voltage tr=tf=10 s, v in =4.0v, c out =ceramic 4.7 f r1171x501b 08 0 604020 180 160 140 120 100 200 time t(s) output voltage v out (v) output current i out (ma) 4.85 5.05 5.00 4.95 4.90 5.10 5.15 5.20 5.30 5.25 5.35 0 1500 500 1000 2000 output current output voltage tr=tf=10 s, v in =6.0v, c out =ceramic 4.7 f
r1171x 20 technical notes on external components and typical application 1. phase compensation in these ics, phase compensation is made with the out put capacitor for securing st able operation even if the load current is varied. for this purpose, use a capacitor with the capacitance range from 4.7 f to 10.0 f, a s c l . in case that using a tantalum capacitor and the esr of the tantalum capacitor is too large, unstable operation may result. fully evaluation is necessary for the whole circuit with considering the frequency characteristic. 2. mounting on pcb make v dd and gnd lines sufficient. if their impedance is hi gh, large current may flow and the pick-up noise or unstable operation may result. therefore use a capacitor with a capacitance range from 4.7 f to 10.0 f between v dd pin and gnd pin as close as possible. further, set an output capacitor between v out pin and gnd pin for phase compensation as close as possible. (refer to the example of typical application) in v dd v out ce gnd c l c i out r1171xxx1b r1171sxx1b typical application 1.5v < = v out <1.8v : c i = 10 f (ceramic),c l = 10 f (ceramic) 1.8v < = v out < = 5.0v : c i = 4.7 f (ceramic),c l = 4.7 f (ceramic) 3. output short protection function in the r1171x series, the output short protection function is built in, further, if the output is short to the gnd or other voltage line, the chip inside is heating, as a result, in case that the junction temperature becomes equal or more than 150 c (typ.), the built-in thermal shutdown circuit works. if the junction temperature becomes equal or more than 150 c (typ.), the ic is protected by the output short protection circuit and the thermal shutdown circuit.
r1171x 21 esr vs. output current (topt = 25 c, v in = set output voltage + 1v, c in = ceramic 10 f) v in c in v ou t ce r1171xxx1b c out spec trum a nalyzer i out esr v in s.a gnd as an output capacitor for this ic, ceramic capacitor is recommendable. however, other low esr type capacitor can be used with this ic. for your reference, noise level is tested with the circuit as shown above, and if the noise level is 40 v or less than 40 v, the esr values are plotted as stable area. upper lim it is described in the next four graphs, or esr vs. output current. (hatched area is the stable area.) r1171s151x r1171s151x 0 250 500 750 1000 1250 1500 output current i out (ma) 0.01 100 1 0.1 10 esr() c in =c out =ceramic 10 f 0 250 500 750 1000 1250 1500 output current i out (ma) 0.01 100 1 0.1 10 esr() c in =c out =ceramic 4.7 f
r1171x 22 r1171s301x r1171s301x 0 250 500 750 1000 1250 1500 output current i out (ma) 0.01 100 1 0.1 10 esr() c in =c out =ceramic 4.7 f 0 250 500 750 1000 1250 1500 output current i out (ma) 0.01 100 1 0.1 10 esr() c in =c out =ceramic 2.2 f r1171s501x r1171s501x 0 250 500 750 1000 1250 1500 output current i out (ma) 0.01 100 1 0.1 10 esr() c in =c out =ceramic 4.7 f 0 250 500 750 1000 1250 1500 output current i out (ma) 0.01 100 1 0.1 10 esr() c in =c out =ceramic 2.2 f r1171j181x r1171j181x 0 250 500 750 1000 1250 1500 1750 2000 0.01 100 1 0.1 10 c in =c out =ceramic 4.7 f output current i out (ma) esr() 0 250 500 750 1000 1250 1500 1750 2000 0.01 100 1 0.1 10 c in =c out =ceramic 2.2 f output current i out (ma) esr()
r1171x 23 r1171j301x r1171j301x 0 250 500 750 1000 1250 1500 1750 2000 0.01 100 1 0.1 10 c in =c out =ceramic 4.7 f output current i out (ma) esr() 0 250 500 750 1000 1250 1500 1750 2000 0.01 100 1 0.1 10 c in =c out =ceramic 2.2 f output current i out (ma) esr() r1171j501x r1171j501x 0 250 500 750 1000 1250 1500 1750 2000 0.01 100 1 0.1 10 c in =c out =ceramic 4.7 f output current i out (ma) esr() 0 250 500 750 1000 1250 1500 1750 2000 0.01 100 1 0.1 10 c in =c out =ceramic 2.2 f output current i out (ma) esr()
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