L4953G Datasheet, PDF (1/6 Pages) STMicroelectronics – MULTIFUNCTION VOLTAGE REGULATOR FOR CAR RADIO

®
L4953G
MULTIFUNCTION VOLTAGE REGULATOR FOR CAR RADIO
3 OUTPUTS:
9.2V (500mA);
5V (1A);
5V (100mA) STANDBY
OUT1 (9.2V) AND OUT2 (5V) WITH INDE-
PENDENT ENABLE CONTROL FOR STAND-
BY 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
PRELIMINARY DATA
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 sup-
ply capacitor that will hold enough energy for the
5V Stand-by line to allow the µP to store data.
7
VS
LOAD DUMP
3
POW GND
1
EN 5V
12
STCAP
2
EN 9.2V
15
EN 16V
5
IGN INP
PROT
5V, 100mA
REGULATOR
STAND-BY
5V, 1000mA
REGULATOR
SWITCHED
11
STAND-BY 5V
9
OUT 5V
9.2V, 500mA
REGULATOR
SWITCHED
10
OUT 9.2V
16V, 2A
VOLTAGE CLAMP
SWITCHED
4
OUT 16V
VCAP
REF Vref1 LVW THRESHOLD
GEN _{Vref2 Reset THRESHOLD}
IGNITION THRESHOLD
OVERVOLTAGE
UNDERVOLTAGE
THERMAL PROT
RESET
SIG GND
8
D97AU579
6
IGN OUT
13
LVW/FAULT
14
RESET
April 1999
1/6
This is preliminary information on a new product now in development. Details are subject to change without notice.