L4947PD Datasheet, PDF (1/6 Pages) STMicroelectronics – 5V-0.5A VERY LOW DROP REGULATOR WITH RESET

®
L4947PD
5V-0.5A VERY LOW DROP REGULATOR WITH RESET
PRECISE OUTPUT VOLTAGE (5V ± 4%)
OVER FULL TEMPERATURE RANGE
(– 40 / 125 °C)
VERY LOW VOLTAGE DROP (0.75Vmax)
OVER FULL T RANGE
OUTPUT CURRENT UP TO 500mA
RESET FUNCTION
POWER-ON RESET DELAY PULSE DE-
FINED BY THE EXTERNAL CAPACITOR
+ 80V LOAD DUMP PROTECTION
– 80V LOAD DUMP PROTECTION
REVERSE VOLTAGE PROTECTION
SHORT CIRCUIT PROTECTION AND THER-
MAL SHUT-DOWN (with hysteresis)
LOW START UP CURRENT
DESCRIPTION
The L4947PD is a monolithic integrated circuit in
HiPSO package specially designed to provide a
stabilized supply voltage for automotive and in-
dustrial electronic systems. Thanks to its very low
voltage drop, in automotive applications the
L4947PD can work correctly even during the
cranking phase, when the battery voltage could
BLOCK DIAGRAM
PowerSO20
ORDERING NUMBER: L4947PD
fall as low as 6V. Furthermore, it incorporates a
complete range of protection circuits against the
dangerous overvoltages always present on the
battery rail of the car. The reset function makes
the device particularly suited to supply microproc-
essor based systems : a signal is available (after
an externally programmable delay) to reset the
microprocessor at power-on phase ; at power-off,
this signal becomes low inhibiting the microproc-
essor.
INPUT
17
PNP OUTPUT
TRANSISTOR
ANTI
SAT.
OUTPUT
3
DUMP
PROTECT.
START
REF.
THERMAL
PROTECTION
RESET
CIRCUIT
ERROR
AMP.
OUTPUT
CURRENT
LIMITER
RESET
OUTPUT
19
GROUND
This1is-2a0dvanced information on a new product now in development or undergoing evaluation. Details are subject to change without 1n-o2t0ice.
2 DELAY CAPACITOR
D94AT106
June 2000
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