L4953

MULTIFUNCTION VOLTAGE REGULATOR FOR CAR RADIO

3 OUTPUTS:

10V (500mA); 5V (1A); 5V (100mA) STANDBY

OUT1 (10V) AND OUT2 (5V) WITH INDE-

PENDENT ENABLE CONTROL FOR STAND-

BY MODE

3A HIGH SIDE DRIVER WITH CLAMPED

OUTPUT (16V)

LOGIC OUTPUT FOR:

– SUPPLY UNDERVOLTAGE (LVW)

– OVERVOLTAGE

– THERMAL PROTECTION

RESET FUNCTION

IGNITION COMPARATOR

REVERSE BATTERY AND LOAD DUMP

PROTECTION

THERMAL SHUTDOWN

DESCRIPTION

The L4953 contains a triple voltage regulator and

a power switch.

The IC includes a monitoring circuit to warn if a

low voltage or no voltage condition is occuring.

In stand-by output is active as long as possible

even when in thermal shutdown or any other fault

conditions.

The STCAP pin allows the use of a reserve sup-

ply capacitor that will hold enough energy for the

5V Stand-by line to allow the

µP to store data.

June 2000

®

5V, 100mA

REGULATOR

STAND-BY

LOAD DUMP

AND REV

BATT PROT

REF

GEN

5V, 1000mA

REGULATOR

SWITCHED

10V, 500mA

REGULATOR

SWITCHED

16V, 3A

VOLTAGE CLAMP

SWITCHED

OVERVOLTAGE

UNDERVOLTAGE

THERMAL PROT

RESET

VCAP

Vref1 LVW THRESHOLD

Vref2 Reset THRESHOLD

IGNITION THRESHOLD

PROT

VS

7

POW GND

3

EN 5V

1

STCAP

12

EN 10V

2

EN 16V

15

11

STAND-BY 5V

9

OUT 5V

10

OUT 10V

4

OUT 16V

14

13

6

IGN OUT

LVW/FAULT

RESET

IGN INP

5

D94AU053A

SIG GND

8

BLOCK DIAGRAM

Multiwatt 15

ORDERING NUMBER: L4953

1/6