L4949E

MULTIFUNCTION VERY LOW DROP

VOLTAGE REGULATOR

OPERATING DC SUPPLY VOLTAGE RANGE

5V - 28V

TRANSIENT SUPPLY VOLTAGE UP TO 40V

EXTREMELY LOW QUIESCENT CURRENT

IN STANDBY MODE

HIGH PRECISION STANDBY OUTPUT VOLT-

AGE 5V

±1%

OUTPUT CURRENT CAPABILITY UP TO

100mA

VERY LOW DROPOUT VOLTAGE LESS

THAN 0.5V

RESET CIRCUIT SENSING THE OUTPUT

VOLTAGE

PROGRAMMABLE RESET PULSE DELAY

WITH EXTERNAL CAPACITOR

VOLTAGE SENSE COMPARATOR

THERMAL SHUTDOWN AND SHORT CIR-

CUIT PROTECTIONS

DESCRIPTION

The L4949E is a monolithic integrated 5V voltage

regulator with a very low dropout output and addi-

tional functions as power-on reset and input volt-

age sense. It is designed for supplying the micro-

computer

controlled

systems

especially

in

automotive applications.

June 2000

®

REG

1.23V

REF

SI

SO

RES

GND

D96AT219

PREREGULATOR 5V

2

µ

+

RESET

2V

SENSE

1.23V

CT

BLOCK DIAGRAM

ORDERING NUMBERS: L4949E (Minidip)

L4949ED (SO8)

L4949EP (SO20W)

Minidip

SO8

SO20W (12+4+4)

1/10