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voltage regulators 1 an79lxx/an79lxxm series 3-pin negative output voltage regulator (100 ma type) overview the an79lxx series and the an79lxxm series are 3-pin, fixed negative output type monolithic voltage regulators. stabilized fixed output voltage is obtained from un- stable dc input voltage without using any external compo- nents. 12 types of output voltage are available: ? 4v, ? 5v, ? 6v, ? 7v, ? 8v, ? 9v, ? 10v, ? 12v, ? 15v, ? 18v, ? 20v and ? 24v. they can be used widely in power circuits with current capacity of up to 100ma. features ? no external components ? output voltage: ? 4v, ? 5v, ? 6v, ? 7v, ? 8v, ? 9v, ? 10v, ? 12v, ? 15v, ? 18v, ? 20v, ? 24v ? built-in overcurrent limit circuit ? built-in thermal overload protection circuit ssip003-p-0000 an79lxx series unit : mm hsip003-p-0000b an79lxxm series unit : mm 5.00.2 5.10.2 13.50.5 (1.0) (1.0) 4.00.2 2.30.2 0.60.15 0.43 +0.1 ?0.05 2.54 0.43 +0.1 ?0.05 21 3 2.6 45 1.6 max. 1.8 max. 4.6 max. 3.0 1.5 123 0.48 max. 0.58 max. 0.44 max. 4.25 max. 2.6 max. 0.8 min. block diagram (an79lxx series) 2 1 3 common (1) output (3) input (2) starter voltage reference error amp. + ? r 1 q 1 pass tr. r sc current limiter thermal protection r 2 note) the number in ( ) shows the pin number for the an79lxxm series. 1 : common 2 : input 3 : output 1 : output 2 : common 3 : intput
an79lxx/an79lxxm series voltage regulators 2 absolute maximum ratings at t a = 25 c electrical characteristics at t a = 25 c ? an79l04, an79l04m ( ? 4v type) v i p d t opr t stg v v mw c c parameter symbol rating unit ? 35 * 1 ? 40 * 2 650 * 3 ? 20 to + 80 ? 55 to + 150 ? 55 to + 125 input voltage power dissipation operating ambient temperature storage temperature an79lxx series an79lxxm series * 1 an79l04/m, an79l05/m, an79l06/m, an79l07/m, an79l08/m, an79l09/m, an79l10/m, an79l12/m, an79l15/m, an79l18/m * 2 an79l20/m, an79l24/m * 3 follow the derating curve. when t j exceeds 150 c, the internal circuit cuts off the output. an79lxxm series is mounted on a standard board ( g lass e p ox y : 20mm 20mm t1.7mm with cu foil of 1cm 2 or more). parameter symbol conditions min typ max output voltage v o v t j = 25 c output voltage tolerance v o v v i = ? 7 to ? 19v, i o = 1 to 70ma line regulation reg in mv v i = ? 6 to ? 20v, t j = 25 c mv load regulation reg l mv i o = 1 to 100ma, t j = 25 c mv i o = 1 to 40ma, t j = 25 c v i = ? 7 to ? 17v, t j = 25 c ma t j = 25 c note 1) the specified condition t j = 25 c means that the test should be carried out within so short a test time (within 10ms) that the characteristic value drift due to the chip junction temperature rise can be ignored. note 2) unless otherwise specified, v i = ? 9v, i o = 40ma, c i = 2 f, c o = 1 f, t j = 0 to 125 c (an79l04) and t j = 0 to 100 c (an79l04m) bias current i bias ma v i = ? 7 to ? 19v, t j = 25 c bias current fluctuation to input ? i bias(in) ma bias current fluctuation to load ? i bias(l) v i o = 1 to 40ma, t j = 25 c output noise voltage v no db f = 10hz to 100khz, t a = 25 c ripple rejection ratio rr v i = ? 7 to ? 17v, f = 120hz, t a = 25 c v t j = 25 c minimum input/output voltage difference v dif(min) ma output short-circuit current i o(short) mv/ c v i = ? 35v, t j = 25 c output voltage temperature coefficient ? v o /t a i o = 5ma unit ? 4.16 ? 4 80 10 3 38 0.5 0.1 40 ? 4.2 60 30 5 55 ? 3.84 ? 3.8 0.8 200 ? 0.4 4.5
voltage regulators an79lxx/an79lxxm series 3 electrical characteristics at t a = 25 c (continued) ? an79l05, an79l05m ( ? 5v type) ? an79l06, an79l06m ( ? 6v type) v o v t j = 25 c v o v v i = ? 9 to ? 21v, i o = 1 to 70ma reg in mv v i = ? 8 to ? 22v, t j = 25 c mv reg l mv i o = 1 to 100ma, t j = 25 c mv i o = 1 to 40ma, t j = 25 c v i = ? 9 to ? 19v, t j = 25 c ma t j = 25 c i bias ma v i = ? 9 to ? 21v, t j = 25 c ? i bias(in) ma ? i bias(l) v i o = 1 to 40ma, t j = 25 c v no db f = 10hz to 100khz, t a = 25 c rr v i = ? 9 to ? 19v, f = 120hz, t a = 25 c v t j = 25 c v dif(min) ma i o(short) mv/ c v i = ? 35v, t j = 25 c ? v o /t a i o = 5ma ? 6.24 ? 6 120 12 3 44 0.5 0.1 60 ? 6.3 60 30 5 55 ? 5.76 ? 5.7 0.8 200 ? 0.4 5.5 parameter symbol conditions min typ max output voltage output voltage tolerance line regulation load regulation note 1) the specified condition t j = 25 c means that the test should be carried out within so short a test time (within 10ms) that the characteristic value drift due to the chip junction temperature rise can be ignored. note 2) unless otherwise specified, v i = ? 11v, i o = 40ma, c i = 2 f, c o = 1 f, t j = 0 to 125 c (an79l06) and t j = 0 to 100 c (an79l06m) bias current bias current fluctuation to input bias current fluctuation to load output noise voltage ripple rejection ratio minimum input/output voltage difference output short-circuit current output voltage temperature coefficient unit v o v t j = 25 c v o v v i = ? 8 to ? 20v, i o = 1 to 70ma reg in mv v i = ? 7 to ? 21v, t j = 25 c mv reg l mv i o = 1 to 100ma, t j = 25 c mv i o = 1 to 40ma, t j = 25 c v i = ? 8 to ? 18v, t j = 25 c ma t j = 25 c i bias ma v i = ? 8 to ? 20v, t j = 25 c ? i bias(in) ma ? i bias(l) v i o = 1 to 40ma, t j = 25 c v no db f = 10hz to 100khz, t a = 25 c ? 4.8 rr v i = ? 8 to ? 18v, f = 120hz, t a = 25 c v t j = 25 c v dif(min) ma i o(short) mv/ c v i = ? 35v, t j = 25 c ? v o /t a i o = 5ma ? 5.2 ? 5 100 11 3 40 0.5 0.1 50 ? 5.25 60 30 5 55 ? 4.75 0.8 200 ? 0.4 5 parameter symbol conditions min typ max output voltage output voltage tolerance line regulation load regulation note 1) the specified condition t j = 25 c means that the test should be carried out within so short a test time (within 10ms) that the characteristic value drift due to the chip junction temperature rise can be ignored. note 2) unless otherwise specified, v i = ? 10v, i o = 40ma, c i = 2 f, c o = 1 f, t j = 0 to 125 c (an79l05) and t j = 0 to 100 c (an79l05m) bias current bias current fluctuation to input bias current fluctuation to load output noise voltage ripple rejection ratio minimum input/output voltage difference output short-circuit current output voltage temperature coefficient unit
an79lxx/an79lxxm series voltage regulators 4 electrical characteristics at t a = 25 c (continued) ? an79l07, an79l07m ( ? 7v type) ? an79l08, an79l08m ( ? 8v type) v o v t j = 25 c v o v v i = ? 11 to ? 23v, i o = 1 to 70ma reg in mv v i = ? 10 to ? 24v, t j = 25 c mv reg l mv i o = 1 to 100ma, t j = 25 c mv i o = 1 to 40ma, t j = 25 c v i = ? 11 to ? 21v, t j = 25 c ma t j = 25 c i bias ma v i = ? 11 to ? 23v, t j = 25 c ? i bias(in) ma ? i bias(l) v i o = 1 to 40ma, t j = 25 c v no db f = 10hz to 100khz, t a = 25 c rr v i = ? 11 to ? 21v, f = 120hz, t a = 25 c v t j = 25 c v dif(min) ma i o(short) mv/ c v i = ? 35v, t j = 25 c ? v o /t a i o = 5ma, t j = 0 to 125 c ? 8.32 ? 8 160 15 3 52 0.5 0.1 80 ? 8.4 80 40 5 54 ? 7.68 ? 7.6 0.8 200 ? 0.6 7 parameter symbol conditions min typ max output voltage output voltage tolerance line regulation load regulation note 1) the specified condition t j = 25 c means that the test should be carried out within so short a test time (within 10ms) that the characteristic value drift due to the chip junction temperature rise can be ignored. note 2) unless otherwise specified, v i = ? 14v, i o = 40ma, c i = 2 f, c o = 1 f, t j = 0 to 125 c (an79l08) and t j = 0 to 100 c (an79l08m) bias current bias current fluctuation to input bias current fluctuation to load output noise voltage ripple rejection ratio minimum input/output voltage difference output short-circuit current output voltage temperature coefficient unit v o v t j = 25 c v o v v i = ? 10 to ? 22v, i o = 1 to 70ma reg in mv v i = ? 9 to ? 23v, t j = 25 c mv reg l mv i o = 1 to 100ma, t j = 25 c mv i o = 1 to 40ma, t j = 25 c v i = ? 10 to ? 20v, t j = 25 c ma t j = 25 c i bias ma v i = ? 10 to ? 22v, t j = 25 c ? i bias(in) ma ? i bias(l) v i o = 1 to 40ma, t j = 25 c v no db f = 10hz to 100khz, t a = 25 c rr v i = ? 10 to ? 20v, f = 120hz, t a = 25 c v t j = 25 c v dif(min) ma i o(short) mv/ c v i = ? 35v, t j = 25 c ? v o /t a i o = 5ma ? 7.28 ? 7 140 13 3 48 0.5 0.1 70 ? 7.35 70 40 5 54 ? 6.72 ? 6.65 0.8 200 ? 0.5 6 parameter symbol conditions min typ max output voltage output voltage tolerance line regulation load regulation note 1) the specified condition t j = 25 c means that the test should be carried out within so short a test time (within 10ms) that the characteristic value drift due to the chip junction temperature rise can be ignored. note 2) unless otherwise specified, v i = ? 12v, i o = 40ma, c i = 2 f, c o = 1 f, t j = 0 to 125 c (an79l07) and t j = 0 to 100 c (an79l07m) bias current bias current fluctuation to input bias current fluctuation to load output noise voltage ripple rejection ratio minimum input/output voltage difference output short-circuit current output voltage temperature coefficient unit
voltage regulators an79lxx/an79lxxm series 5 electrical characteristics at t a = 25 c (continued) ? an79l09, an79l09m ( ? 9v type) ? an79l10, an79l10m ( ? 10v type) v o v t j = 25 c v o v v i = ? 13 to ? 25v, i o = 1 to 70ma reg in mv v i = ? 12 to ? 26v, t j = 25 c mv reg l mv i o = 1 to 100ma, t j = 25 c mv i o = 1 to 40ma, t j = 25 c v i = ? 13 to ? 23v, t j = 25 c ma t j = 25 c i bias ma v i = ? 13 to ? 25v, t j = 25 c ? i bias(in) ma ? i bias(l) v i o = 1 to 40ma, t j = 25 c v no db f = 10hz to 100khz, t a = 25 c rr v i = ? 13 to ? 23v, f = 120hz, t a = 25 c v t j = 25 c v dif(min) ma i o(short) mv/ c v i = ? 35v, t j = 25 c ? v o /t a i o = 5ma ? 10.4 ? 10 160 17 3 65 0.5 0.1 80 ? 10.5 100 50 5 53 ? 9.6 ? 9.5 0.8 200 ? 0.7 9 parameter symbol conditions min typ max output voltage output voltage tolerance line regulation load regulation note 1) the specified condition t j = 25 c means that the test should be carried out within so short a test time (within 10ms) that the characteristic value drift due to the chip junction temperature rise can be ignored. note 2) unless otherwise specified, v i = ? 16v, i o = 40ma, c i = 2 f, c o = 1 f, t j = 0 to 125 c (an79l10) and t j = 0 to 100 c (an79l10m) bias current bias current fluctuation to input bias current fluctuation to load output noise voltage ripple rejection ratio minimum input/output voltage difference output short-circuit current output voltage temperature coefficient unit v o v t j = 25 c v o v v i = ? 12 to ? 24v, i o = 1 to 70ma reg in mv v i = ? 11 to ? 25v, t j = 25 c mv reg l mv i o = 1 to 100ma, t j = 25 c mv i o = 1 to 40ma, t j = 25 c v i = ? 12 to ? 22v, t j = 25 c ma t j = 25 c i bias ma v i = ? 12 to ? 24v, t j = 25 c ? i bias(in) ma ? i bias(l) v i o = 1 to 40ma, t j = 25 c v no db f = 10hz to 100khz, t a = 25 c rr v i = ? 12 to ? 22v, f = 120hz, t a = 25 c v t j = 25 c v dif(min) ma i o(short) mv/ c v i = ? 35v, t j = 25 c ? v o /t a i o = 5ma, t j = 0 to 125 c ? 9.36 ? 9 160 16 3 58 0.5 0.1 80 ? 9.45 90 50 5 53 ? 8.64 ? 8.55 0.8 200 ? 0.6 8 parameter symbol conditions min typ max output voltage output voltage tolerance line regulation load regulation note 1) the specified condition t j = 25 c means that the test should be carried out within so short a test time (within 10ms) that the characteristic value drift due to the chip junction temperature rise can be ignored. note 2) unless otherwise specified, v i = ? 15v, i o = 40ma, c i = 2 f, c o = 1 f, t j = 0 to 125 c (an79l09) and t j = 0 to 100 c (an79l09m) bias current bias current fluctuation to input bias current fluctuation to load output noise voltage ripple rejection ratio minimum input/output voltage difference output short-circuit current output voltage temperature coefficient unit
an79lxx/an79lxxm series voltage regulators 6 electrical characteristics at t a = 25 c (continued) ? an79l12, an79l12m ( ? 12v type) ? an79l15, an79l15m ( ? 15v type) v o v t j = 25 c v o v v i = ? 18 to ? 28v, i o = 1 to 70ma reg in mv v i = ? 17.5 to ? 33v, t j = 25 c mv reg l mv i o = 1 to 100ma, t j = 25 c mv i o = 1 to 40ma, t j = 25 c v i = ? 18 to ? 28v, t j = 25 c ma t j = 25 c i bias ma v i = ? 18 to ? 30v, t j = 25 c ? i bias(in) ma ? i bias(l) v i o = 1 to 40ma, t j = 25 c v no db f = 10hz to 100khz, t a = 25 c rr v i = ? 18 to ? 28v, f = 120hz, t a = 25 c v t j = 25 c v dif(min) ma i o(short) mv/ c v i = ? 35v, t j = 25 c ? v o /t a i o = 5ma ? 15.6 ? 15 200 25 3 90 0.5 0.1 100 ? 15.75 130 60 5 51 ? 14.4 ? 14.25 0.8 200 ? 0.9 12 parameter symbol conditions min typ max output voltage output voltage tolerance line regulation load regulation note 1) the specified condition t j = 25 c means that the test should be carried out within so short a test time (within 10ms) that the characteristic value drift due to the chip junction temperature rise can be ignored. note 2) unless otherwise specified, v i = ? 23v, i o = 40ma, c i = 2 f, c o = 1 f, t j = 0 to 125 c (an79l15) and t j = 0 to 100 c (an79l15m) bias current bias current fluctuation to input bias current fluctuation to load output noise voltage ripple rejection ratio minimum input/output voltage difference output short-circuit current output voltage temperature coefficient unit v o v t j = 25 c v o v v i = ? 15 to ? 27v, i o = 1 to 70ma reg in mv v i = ? 14.5 to ? 30v, t j = 25 c mv reg l mv i o = 1 to 100ma, t j = 25 c mv i o = 1 to 40ma, t j = 25 c v i = ? 15 to ? 25v, t j = 25 c ma t j = 25 c i bias ma v i = ? 15 to ? 27v, t j = 25 c ? i bias(in) ma ? i bias(l) v i o = 1 to 40ma, t j = 25 c v no db f = 10hz to 100khz, t a = 25 c rr v i = ? 15 to ? 25v, f = 120hz, t a = 25 c v t j = 25 c v dif(min) ma i o(short) mv/ c v i = ? 35v, t j = 25 c ? v o /t a i o = 5ma ? 12.5 ? 12 200 20 3 75 0.5 0.1 100 ? 12.6 100 50 5 52 ? 11.5 ? 11.4 0.8 200 ? 0.8 10 parameter symbol conditions min typ max output voltage output voltage tolerance line regulation load regulation note 1) the specified condition t j = 25 c means that the test should be carried out within so short a test time (within 10ms) that the characteristic value drift due to the chip junction temperature rise can be ignored. note 2) unless otherwise specified, v i = ? 19v, i o = 40ma, c i = 2 f, c o = 1 f, t j = 0 to 125 c (an79l12) and t j = 0 to 100 c (an79l12m) bias current bias current fluctuation to input bias current fluctuation to load output noise voltage ripple rejection ratio minimum input/output voltage difference output short-circuit current output voltage temperature coefficient unit
voltage regulators an79lxx/an79lxxm series 7 electrical characteristics at t a = 25 c (continued) ? an79l18, an79l18m ( ? 18v type) ? an79l20, an79l20m ( ? 20v type) v o v t j = 25 c v o v v i = ? 21 to ? 33v, i o = 1 to 70ma reg in mv v i = ? 21 to ? 33v, t j = 25 c mv reg l mv i o = 1 to 100ma, t j = 25 c mv i o = 1 to 40ma, t j = 25 c v i = ? 21 to ? 32v, t j = 25 c ma t j = 25 c i bias ma v i = ? 21 to ? 33v, t j = 25 c ? i bias(in) ma ? i bias(l) v i o = 1 to 40ma, t j = 25 c v no db f = 10hz to 100khz, t a = 25 c 5 rr v i = ? 22 to ? 32v, f = 120hz, t a = 25 c v t j = 25 c v dif(min) ma i o(short) mv/ c v i = ? 35v, t j = 25 c ? v o /t a i o = 5ma ? 18.7 ? 18 200 30 3 110 0.5 0.1 100 ? 18.9 160 80 50 ? 17.3 ? 17.1 0.8 200 ? 1 15 parameter symbol conditions min typ max output voltage output voltage tolerance line regulation load regulation note 1) the specified condition t j = 25 c means that the test should be carried out within so short a test time (within 10ms) that the characteristic value drift due to the chip junction temperature rise can be ignored. note 2) unless otherwise specified, v i = ? 27v, i o = 40ma, c i = 2 f, c o = 1 f, t j = 0 to 125 c (an79l18) and t j = 0 to 100 c (an79l18m) bias current bias current fluctuation to input bias current fluctuation to load output noise voltage ripple rejection ratio minimum input/output voltage difference output short-circuit current output voltage temperature coefficient unit v o v t j = 25 c v o v v i = ? 23 to ? 35v, i o = 1 to 70ma reg in mv v i = ? 23 to ? 35v, t j = 25 c mv reg l mv i o = 1 to 100ma, t j = 25 c mv i o = 1 to 40ma, t j = 25 c v i = ? 24 to ? 34v, t j = 25 c ma t j = 25 c i bias ma v i = ? 23 to ? 35v, t j = 25 c ? i bias(in) ma ? i bias(l) v i o = 1 to 40ma, t j = 25 c v no db f = 10hz to 100khz, t a = 25 c rr v i = ? 24 to ? 34v, f = 120hz, t a = 25 c v t j = 25 c v dif(min) ma i o(short) mv/ c v i = ? 35v, t j = 25 c ? v o /t a i o = 5ma ? 20.8 ? 20 200 35 3 135 0.5 0.1 100 ? 21 180 90 5 49 ? 19.2 ? 19 0.8 200 ? 1 17 parameter symbol conditions min typ max output voltage output voltage tolerance line regulation load regulation note 1) the specified condition t j = 25 c means that the test should be carried out within so short a test time (within 10ms) that the characteristic value drift due to the chip junction temperature rise can be ignored. note 2) unless otherwise specified, v i = ? 29v, i o = 40ma, c i = 2 f, c o = 1 f, t j = 0 to 125 c (an79l20) and t j = 0 to 100 c (an79l20m) bias current bias current fluctuation to input bias current fluctuation to load output noise voltage ripple rejection ratio minimum input/output voltage difference output short-circuit current output voltage temperature coefficient unit
an79lxx/an79lxxm series voltage regulators 8 electrical characteristics at t a = 25 c (continued) ? an79l24, AN79L24M ( ? 24v type) main characteristics v o v t j = 25 c v o v v i = ? 27 to ? 38v, i o = 1 to 70ma reg in mv v i = ? 27 to ? 38v, t j = 25 c mv reg l mv i o = 1 to 100ma, t j = 25 c mv i o = 1 to 40ma, t j = 25 c v i = ? 27 to ? 37v, t j = 25 c ma t j = 25 c i bias ma v i = ? 27 to ? 38v, t j = 25 c ? i bias(in) ma ? i bias(l) v i o = 1 to 40ma, t j = 25 c v no db f = 10hz to 100khz, t a = 25 c rr v i = ? 28 to ? 38v, f = 120hz, t a = 25 c v t j = 25 c v dif(min) ma i o(short) mv/ c v i = ? 35v, t j = 25 c ? v o /t a i o = 5ma ? 25 ? 24 200 40 3 170 0.5 0.1 100 ? 25.2 200 100 5 49 ? 23 ? 22.8 0.8 200 ? 1 20 parameter symbol conditions min typ max output voltage output voltage tolerance line regulation load regulation note 1) the specified condition t j = 25 c means that the test should be carried out within so short a test time (within 10ms) that the characteristic value drift due to the chip junction temperature rise can be ignored. note 2) unless otherwise specified, v i = ? 33v, i o = 40ma, c i = 2 f, c o = 1 f, t j = 0 to 125 c (an79l24) and t j = 0 to 100 c (AN79L24M) bias current bias current fluctuation to input bias current fluctuation to load output noise voltage ripple rejection ratio minimum input/output voltage difference output short-circuit current output voltage temperature coefficient unit 1.0 0.8 0.6 0.4 0.2 0 0 20 40 60 80 100 120 140 160 ambient temperature t a ( c) power dissipation p d (w) p d ? t a (an79lxx series) ? 5.12 ? 5.08 ? 5.04 ? 5.00 ? 4.96 ? 4.92 ? 4.88 ? 4.84 ? 4.80 junction temperature t j ( c) output voltage v o (v) v o ? t j ? 25 0 25 50 75 100 125 an79l05 v i = ? 10v i o = 1ma 1.0 0.8 0.6 0.4 0.2 0 0 20 40 60 80 100 120 140 160 ambient temperature t a ( c) power dissipation p d (w) p d ? t a (an79lxxm series) independent ic without a heat sink r th(j-a) = 190 c/w p d = 658mw (25 c) mounted on standard board (glass epoxy: 20 mm 20 mm t1.7mm with cu foil of 1cm 2 or more)
voltage regulators an79lxx/an79lxxm series 9 main characteristics (continued) 120 100 80 60 40 20 0 10 100 an79l05 i o = 5ma 1k 10k 100k frequency f (hz) ripple rejection ratio rr (db) rr ? f 0246810 time t ( s) 10 0 ? 10 ? 20 20 15 10 5 output voltage fluctuation (mv) input voltage v i (v) input transient response an79l05 0 1020304050 time t ( s) 1 0 ? 1 ? 2 200 100 0 output voltage fluctuation (v) load current i o (ma) load transient response an79l05 1.4 1.2 1.0 0.8 0.6 0.4 ? 50 0 50 100 150 junction temperature t j ( c) minimum input/output voltage difference v dif(min) (v) v dif(min) ? t j i o = 100ma i o = 20ma i o = 10ma i o = 1ma an79l05 basic regulator circuit c o c i input ? v i ? v o output an79lxx common 3 1 2 ? + ? + connect c i of 2 f when the input line is long. c o improves the transient response. 1 f
an79lxx/an79lxxm series voltage regulators 10 usage notes 1. cautions for a basic circuit c i : when a wiring from a smoothing circuit to a three-pin regulator is long, it is likely to oscillate at output. a capacitor of 0.1 f to 0.47 f should be connected near an input pin. c o : deadly needed to prevent from oscillation (0.33 f to 1.0 f). it is recommended to use a capacitor of a small internal imped- ance (ex. tantalum capacitor) when using it under a low tem- perature. when any sudden change of load current is likely to occur, con- nect an electrolytic capacitor of 10 f to 100 f to improve a transitional response of output voltage. d i : normally unnecessary. but add it in the case that there is a residual voltage at the output capacitor co even after switching off the supply power because a current is likely to flow into an output pin of the ic and damage the ic. 2. other caution items 1) short-circuit between the input pin and gnd pin if the input pin is short-circuitted to gnd or is cut off when a large capacitance capacitor has been con- nected to the ic's load, a voltage of a capacitor con- nected to an output pin is applied between input/out- put of the ic and this likely results in damage of the ic. it is necessary, therefore, to connect a diode, as shown in figure 2, to counter the reverse bias between input/output pins. 2) floating of gnd pin if a gnd pin is made floating in an operating mode, an unstabilized input voltage is outputted. in this case, a thermal protection circuit inside the ic does not normally operate. in this state, if the load is short-circuited or overloaded, it is likely to damage the ic. application circuit example figure 1 c o v o c i v i d i 1 3 2 in gnd out figure 2 c o output 1 3 2 ? + ? v o 2 f 1 f i bias an79lxx 3 1 2 r 2 r 1 v o ' ? v i input common output | v o | = v o ' 1 + + i q r 1 r 2 r 1 ? + ? + note) v o varies due to sample to sample variation of i bias . never fail to adjust individually with r 1 . n n n n n n n n n
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