L4953G| Datasheet

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L4953G

MULTIFUNCTION VOLTAGE REGULATOR FOR CAR RADIO
PRELIMINARY DATA

3 OUTPUTS: 9.2V (500mA); 5V (1A); 5V (100mA) STANDBY OUT1 (9.2V) AND OUT2 (5V) WITH INDEPENDENT ENABLE CONTROL FOR STANDBY MODE 2A 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 L4953G contains a triple voltage regulator and a power switch. BLOCK DIAGRAM
VS 7

Multiwatt15

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 supply capacitor that will hold enough energy for the 5V Stand-by line to allow the uP to store data.

LOAD DUMP POW GND 3

5V, 100mA REGULATOR STAND-BY 5V, 1000mA REGULATOR SWITCHED

11

STAND-BY 5V

9

OUT 5V

EN 5V STCAP EN 9.2V

1 12 9.2V, 500mA REGULATOR SWITCHED 10

OUT 9.2V

2 16V, 2A VOLTAGE CLAMP SWITCHED 4

OUT 16V

EN 16V

15 VCAP REF GEN Vref1 LVW THRESHOLD Vref2 Reset THRESHOLD IGNITION THRESHOLD OVERVOLTAGE UNDERVOLTAGE THERMAL PROT RESET

IGN INP

5

PROT

SIG GND

8 6
D97AU579

13 LVW/FAULT

14 RESET

IGN OUT

April 1999
This is preliminary information on a new product now in development. Details are subject to change without notice.

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L4953G DATASHEET