L387A
VERY LOW DROP 5V REGULATOR WITH RESET
.
.
.
.
.
PRECISE OUTPUT VOLTAGE (5 V
±
4 %)
VERY LOW DROPOUT VOLTAGE
OUTPUT CURRENT IN EXCESS OF 500mA
POWER-ON, POWER-OFF INFORMATION
(RESET FUNCTION)
HIGH NOISE IMMUNITY ON RESET DELAY
CAPACITOR
DESCRIPTION
The L387A is a very low drop voltage regulator in
a Pentawatt
®
package specially designed to pro-
vide stabilized 5V supplies in consumer and in-
dustrial applications. Thanks to its very low in-
put/output voltage drop this device is very useful
in battery powered equipment, reducing con-
sumption and prolonging battery life. A reset out-
put makes the L387A particularly suitable for mi-
croprocessor systems. This output provides a re-
set signal when power is applied (after an exter-
nal programmable delay) and goes low when
ABSOLUTE MAXIMUM RATINGS
Symbol
V
i
T
j
, T
stg
D.C. Input Voltage
Junction and Storage Temperature Range
Parameter
Pentawatt
®
ORDERING NUMBER :
L387A
power is removed, inhibiting the microprocessor.
An hysteresis on reset delay capacitor raises the
immunity to the ground noise.
Value
35
–55 to 150
Unit
V
°C
APPLICATION CIRCUIT
* Min 33
µF
and max. ESR
≤
3
Ω
over temperature range.
October 1991
1/6
STMICROELECTRONICS [ STMICROELECTRONICS ]
