lm2936-2.5 ultra-low quiescent current 2.5v regulator general description the lm2936-2.5 ultra-low quiescent current regulator fea- tures low dropout voltage and low current in the standby mode. with less than 25 a quiescent current at a 100 a load, the lm2936-2.5 is ideally suited for automotive and other battery operated systems. the lm2936-2.5 retains all of the features that are common to low dropout regulators in- cluding a low dropout pnp pass device, short circuit protec- tion, reverse battery protection, and thermal shutdown. the lm2936-2.5 has a 40v maximum operating voltage limit, a ?40c to +125c operating temperature range, and 3% output voltage tolerance over the entire output current, input voltage, and temperature range. the lm2936-2.5 is avail- able in a to-92 package, a so-8 surface mount package, as well as sot-223 and to-252 surface mount power pack- ages. features n ultra low quiescent current (i q 25 a for i o 100 a) n fixed 2.5v, 50 ma output n output tolerance 3% over line, load, and temperature n dropout voltage typically 200 mv @ i o =50ma n reverse battery protection n ?50v reverse transient protection n internal short circuit current limit n internal thermal shutdown protection n 40v operating voltage limit typical application connection diagrams ds200015-1 * required if regulator is located more than 2" from power supply filter capacitor. * * required for stability. must be rated for 22 f minimum over intended operating temperature range. effective series resistance (esr) is critical, se e curve. locate capacitor as close as possible to the regulator output and ground pins. capacitance may be increased without bound. to-252 ds200015-25 top view order number lm2936dt-2.5 see ns package number td03b sot-223 ds200015-26 top view order number lm2936mp-2.5 see ns package number ma04a preliminary july 2000 lm2936-2.5 ultra-low quiescent current 2.5v regulator ? 2000 national semiconductor corporation ds200015 www.national.com
connection diagrams (continued) 8-pin so (m) ds200015-6 top view order number lm2936m-2.5 see ns package number m08a to-92 ds200015-2 bottom view order number lm2936z-2.5 see ns package number z03a lm2936-2.5 www.national.com 2
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 (survival) +60v, ?50v esd susceptibility (note 2) 2000v power dissipation (note 3) internally limited junction temperature (t jmax ) 150c storage temperature range ?65c to +150c lead temperature (soldering, 10 sec.) 260c operating ratings operating temperature range ?40c to +125c maximum input voltage (operational) 40v to-92 (z03a) q ja 195c/w so-8 (m08a) q ja 140c/w so-8 (m08a) q jc 45c/w to-252 (td03b) q ja 126c/w to-252 (td03b) q jc 6c/w sot-223 (ma04a) q ja 149c/w sot-223 (ma04a) q jc 36c/w electrical characteristics v in = 14v, i o = 10 ma, t j = 25c, unless otherwise specified. boldface limits apply over entire operating temperature range typical tested parameter conditions (note 4) limit units (note 5) output voltage 4.0v v in 26v, 2.425 v min 100a i o 50ma (note 6) 2.5 v 2.575 v max quiescent current i o = 100 a, 8v v in 24v 15 25 a max i o = 10 ma, 8v v in 24v 0.20 0.50 ma max i o = 50 ma, 8v v in 24v 1.5 2.5 ma max line regulation 9v v in 16v 5 10 mv max 6v v in 40v, i o = 1 ma 10 30 load regulation 100 a i o 5ma 10 30 mv max 5ma i o 50 ma 10 30 dropout voltage i o = 100 a 0.05 0.10 v max i o = 50 ma 0.20 0.40 v max short circuit current v o = 0v 120 65 ma min 250 ma max output impedance i o = 30 madc and 10 marms, 450 m w f = 1000 hz output noise voltage 10 hz100 khz 500 v rms long term stability 20 mv/1000 hr ripple rejection v ripple =1v rms ,f ripple = 120 hz 60 40 db min reverse polarity r l = 500 w ,v o 3 ?0.3v ?15 v min dc input voltage reverse polarity r l = 500 w , t = 1 ms ?80 ?50 v min transient input voltage output leakage with v in = ?15v, r l = 500 w ?0.1 ?600 a max reverse polarity input note 1: absolute maximum ratings indicate limits beyond which damage to the device may occur. dc and ac electrical specifications do not apply when operating the device beyond its specified operating ratings. note 2: human body model, 100 pf discharge through a 1.5 k w resistor. note 3: the maximum power dissipation is a function of t jmax , q ja , and t a . the maximum allowable power dissipation at any ambient temperature is p d =(t jmax ?t a )/ q ja . if this dissipation is exceeded, the die temperature will rise above 150c and the lm2936 will go into thermal shutdown. note 4: typicals are at 25c (unless otherwise specified) and represent the most likely parametric norm. note 5: tested limits are guaranteed to national's aoql (average outgoing quality level) and 100% tested. note 6: to ensure constant junction temperature, pulse testing is used. lm2936-2.5 www.national.com 3
typical performance characteristics maximum power dissipation (to-92) ds200015-7 dropout voltage ds200015-8 dropout voltage ds200015-9 quiescent current ds200015-10 quiescent current ds200015-11 quiescent current ds200015-12 quiescent current ds200015-13 quiescent current ds200015-14 output capacitor esr ds200015-15 peak output current ds200015-16 peak output current ds200015-17 line transient response ds200015-19 lm2936-2.5 www.national.com 4
typical performance characteristics (continued) applications information unlike other pnp low dropout regulators, the lm2936 re- mains fully operational to 40v. owing to power dissipation characteristics of the available packages, full output current cannot be guaranteed for all combinations of ambient tem- perature and input voltage. the junction to ambient thermal resistance q ja rating has two distinct components: the junction to case thermal resis- tance rating q jc ; and the case to ambient thermal resistance rating q ca . the relationship is defined as: q ja = q jc + q ca . for the so-8 and to-252 surface mount packages the q ja rating can be improved by using the copper mounting pads on the printed circuit board as a thermal conductive path to extract heat from the package. on the so-8 package the four ground pins are thermally connected to the backside of the die. adding approximately 0.04 square inches of 2 oz. copper pad area to these four pins will improve the q ja rating to approximately 110c/w. if this extra pad are is placed directly beneath the package there should not be any impact on board density. on the to-252 package the ground tab is thermally con- nected to the backside of the die. adding 1 square inch of 2 oz. copper pad area directly under the ground tab will im- prove the q ja rating to approximately 50c/w. while the lm2936 has an internally set thermal shutdown point of typically 150c, this is intended as a safety feature only. continuous operation near the thermal shutdown tem- perature should be avoided as it may have a negative affect on the life of the device. while the lm2936-2.5 will survive input transients to +60v, output regulation is not guaranteed for input voltages greater than 40v. the lm2936 will not withstand a output short cir- cuit with the input above 40v because of safe operating area limitations in the internal pnp pass device. with input volt- ages above 60v the lm2936 will break down with cata- strophic effects on the regulator and possibly the load as well. do not use this device in a design where the input op- erating voltage may exceed 40v, or where transients are likely to exceed 60v. ripple rejection ds200015-21 load transient response ds200015-22 output impedance ds200015-24 lm2936-2.5 www.national.com 5
physical dimensions inches (millimeters) unless otherwise noted 8-lead small outline molded package (m) ns package number m08a to-252 package (dt) ns package number td03b lm2936-2.5 www.national.com 6
physical dimensions inches (millimeters) unless otherwise noted (continued) sot-223 package (mp) ns package number ma04a 3-lead to-92 plastic package (z) ns package number z03a lm2936-2.5 www.national.com 7
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 tel: 1-800-272-9959 fax: 1-800-737-7018 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 lm2936-2.5 ultra-low quiescent current 2.5v regulator 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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