lm320l/lm79lxxac series 3-terminal negative regulators general description the lm320l/lm79lxxac dual marked series of 3-terminal negative voltage regulators features fixed output voltages of ?5v, ?12v, and ?15v with output current capabilities in excess of 100ma. these devices were designed using the latest computer techniques for optimizing the packaged ic thermal/electrical performance. the lm79lxxac series, even when combined with a minimum output compensation capacitor of 0.1f, exhibits an excellent transient response, a maximum line regulation of 0.07% v o /v, and a maximum load regulation of 0.01% v o /ma. the lm320l/lm79lxxac series also includes, as self-protection circuitry: safe operating area circuitry for out- put transistor power dissipation limiting, a temperature inde- pendent short circuit current limit for peak output current limiting, and a thermal shutdown circuit to prevent excessive junction temperature. although designed primarily as fixed voltage regulators, these devices may be combined with simple external circuitry for boosted and/or adjustable volt- ages and currents. the lm79lxxac series is available in the 3-lead to-92 package, and so-8; 8 lead package. the lm320l series is available in the 3-lead to-92 package. for output voltage other than ?5v, ?12v and ?15v, the lm137l series provides an output voltage range from 1.2v to 47v. features n preset output voltage error is less than 5% overload, line and temperature n specified at an output current of 100ma n easily compensated with a small 0.1f output capacitor n internal short-circuit, thermal and safe operating area protection n easily adjustable to higher output voltages n maximum line regulation less than 0.07% v out /v n maximum load regulation less than 0.01% v out /ma typical applications connection diagrams fixed output regulator ds007748-1 *required if the regulator is located far from the power supply filter. a 1f aluminum electrolytic may be substituted. * * required for stability. a 1f aluminum electrolytic may be substituted. adjustable output regulator ds007748-3 ?v 0 = ?5v ? (5v/r1 + i q ) r2, 5v/r1 > 3i q so-8 plastic (narrow body) ds007748-4 top view order number lm79l05acm, lm79l12acm lm79l15acm, lm79l05acmx, lm79l12acmx or lm79l15acmx see ns package number m08a to-92 plastic package (z) ds007748-2 bottom view order number lm320lz-5.0, lm79l05acz, LM320LZ-12, lm79l12acz, lm320lz-15 or lm79l15acz see ns package number z03a september 2001 lm320l/lm79lxxac series 3-terminal negative regulators ? 2001 national semiconductor corporation ds007748 www.national.com
absolute maximum ratings (note 1) if military/aerospace specified devices are required, please contact the national semiconductor sales office/ distributors for availability and specifications. input voltage v o = ?5v, ?12v, ?15v ?35v internal power dissipation (note 2) internally limited operating temperature range 0c to +70c maximum junction temperature +125c storage temperature range ?55c to +150c lead temperature (soldering, 10 sec.) 260c electrical characteristics (note 3) t a = 0c to +70c unless otherwise noted. output voltage ?5v ?12v ?15v input voltage (unless otherwise noted) ?10v ?17v ?20v units symbol parameter conditions min typ max min typ max min typ max v o output voltage t j = 25c, i o = 100ma ?5.2 ?5 ?4.8 ?12.5 ?12 ?11.5 ?15.6 ?15 ?14.4 1ma i o 100ma ?5.25 ?4.75 ?12.6 ?11.4 ?15.75 ?14.25 v min v in v max (?20 v in ?7.5) (?27 v in ?14.8) (?30 v in ?18) v 1ma i o 40ma ?5.25 ?4.75 ?12.6 ?11.4 ?15.75 ?14.25 v min v in v max (?20 v in ?7) (?27 v in ?14.5) (?30 v in ?17.5) d v o line regulation t j = 25c, i o = 100ma 60 45 45 mv v min v in v max (?20 v in ?7.3) (?27 v in ?14.6) (?30 v in ?17.7) v t j = 25c, i o = 40ma 60 45 45 mv v min v in v max (?20 v in ?7) (?27 v in ?14.5) (?30 v in ?17.5) v d v o load regulation t j = 25c 50 100 125 mv 1ma i o 100ma d v o long term stability i o = 100ma 20 48 60 mv/khrs i q quiescent current i o = 100ma 2 6 2 6 2 6 ma d i q quiescent current 1ma i o 100ma 0.3 0.3 0.3 change 1ma i o 40ma 0.1 0.1 0.1 ma i o = 100ma 0.25 0.25 0.25 ma v min v in v max (?20 v in ?7.5) (?27 v in ?14.8) (?30 v in ?18) v v n output noise voltage t j = 25c, i o = 100ma 40 96 120 v f = 10hz ? 10khz ripple rejection t j = 25c, i o = 100ma 50 52 50 db f = 120hz input voltage t j = 25c, i o = 100ma ?7.3 ?14.6 ?17.7 v required to i o = 40ma ?7.0 ?14.5 ?17.5 v maintain line regulation note 1: absolute maximum ratings indicate limits beyond which damage to the device may occur. operating ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. note 2: thermal resistance of z package is 60c/w q jc , 232c/w q ja at still air, and 88c/w at 400 ft/min of air. the m package q ja is 180c/w in still air. the maximum junction temperature shall not exceed 125c on electrical parameters. note 3: to ensure constant junction temperature, low duty cycle pulse testing is used. lm320l/lm79lxxac www.national.com 2
typical performance characteristics maximum average power dissipation (to-92) ds007748-11 peak output current ds007748-12 short circuit output current ds007748-13 dropout voltage ds007748-14 ripple rejection ds007748-15 output voltage vs. temperature (normalized to 1v @ 25c) ds007748-16 quiescent current ds007748-17 output impedance ds007748-18 lm320l/lm79lxxac www.national.com 3
typical applications schematic diagrams 15v, 100ma dual power supply ds007748-6 ?5v ds007748-9 lm320l/lm79lxxac www.national.com 4
schematic diagrams (continued) ?12v and ?15v ds007748-10 lm320l/lm79lxxac www.national.com 5
physical dimensions inches (millimeters) unless otherwise noted s.o. package (m) order number lm79l05acm, lm79l12acm, lm79l15acm, lm79l05acmx, lm79l12acmx, or lm79l15acmx ns package number m08a molded offset to-92 (z) order number lm320lz-5.0, lm79l05acz, LM320LZ-12, lm79l12acz, lm320lz-15 or lm79l15acz ns package number z03a lm320l/lm79lxxac www.national.com 6
notes life support policy national's products are not authorized for use as critical components in life support devices or systems without the express written approval of the president and general counsel of national semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. a critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. national semiconductor corporation americas email: support@nsc.com national semiconductor europe fax: +49 (0) 180-530 85 86 email: europe.support@nsc.com deutsch tel: +49 (0) 69 9508 6208 english tel: +44 (0) 870 24 0 2171 fran?ais tel: +33 (0) 1 41 91 8790 national semiconductor asia pacific customer response group tel: 65-2544466 fax: 65-2504466 email: ap.support@nsc.com national semiconductor japan ltd. tel: 81-3-5639-7560 fax: 81-3-5639-7507 www.national.com lm320l/lm79lxxac series 3-terminal negative regulators national does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and national reserves the righ t at any time without notice to change said circuitry and specifications.
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