LP2957

LP2957/LP2957A 5V Low-Dropout Regulator for µP Applications June 1998 LP2957/LP2957A 5V Low-Dropout Regulator for µP Applications General Description The LP2957 is a 5V micropower voltage regulator with electronic 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 eliminate transition voltage states where µP operation may be unpredictable. 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 temperature and over the full operating temperature range. The LP2957 is available in the five-lead TO-220 and TO-263 packages. Features n n n n n n n n n n 5V output within 1.4% over temperature (A grade) Easily programmed for snap-on/snap-off output Guaranteed 250 mA output current Extremely low quiescent current Low Input-Output voltage required for regulation Reverse battery protection Extremely tight line and load regulation Very low temperature coefficient Current and thermal limiting 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...