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LP2957IT Scheda tecnica(PDF) 1 Page - National Semiconductor (TI) |
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LP2957IT Scheda tecnica(HTML) 1 Page - National Semiconductor (TI) |
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1 / 14 page  LP2957/LP2957A 5V Low-Dropout Regulator for µP Applications General Description The LP2957 is a 5V micropower voltage regulator with elec- tronic shutdown, error flag, very low quiescent current (150 µA typical at 1 mA load), and very low dropout voltage (470 mV typical at 250 mA load current). Output can be wired for snap-on/snap-off operation to elimi- nate transition voltage states where µP operation may be un- predictable. Output crowbar (50 mA typical pull-down current) will bring down the output quickly when the regulator snaps off or when the shutdown function is activated. The part has tight line and load regulation (0.04% typical) and low output temperature coefficient (20 ppm/˚C typical). The accuracy of the 5V output is guaranteed at room tem- perature and over the full operating temperature range. The LP2957 is available in the five-lead TO-220 and TO-263 packages. Features n 5V output within 1.4% over temperature (A grade) n Easily programmed for snap-on/snap-off output n Guaranteed 250 mA output current n Extremely low quiescent current n Low Input-Output voltage required for regulation n Reverse battery protection n Extremely tight line and load regulation n Very low temperature coefficient n Current and thermal limiting n Error flag signals when output is out of regulation Applications n High-efficiency linear regulator n Battery-powered regulator Package Outline Bent, Staggered Leads 5-Lead TO-220 (T) DS011340-16 Top View Order Number LP2957AIT or LP2957IT See NS Package Number T05D Plastic Surface Mount Package 5-Lead TO-263 (S) DS011340-17 Top View DS011340-18 Side View Order Number LP2957AIS or LP2957IS See NS Package Number TS5B June 1998 © 1999 National Semiconductor Corporation DS011340 www.national.com |
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