L4953K Datasheet, PDF (1/8 Pages) STMicroelectronics – MULTIFUNCTION VOLTAGE REGULATOR FOR CAR RADIO

®
L4953K
MULTIFUNCTION VOLTAGE REGULATOR FOR CAR RADIO
3 OUTPUTS:
8.25V (500mA); 5V (1A); 5V (100mA)
STANDBY
OUT1 (8.25V) AND OUT2 (5V) WITH INDE-
PENDENT ENABLE CONTROL FOR STAND-
BY MODE
1.5A HIGH SIDE DRIVER WITH CLAMPED
OUTPUT (16V)
LOGIC OUTPUT FOR:
– SUPPLY UNDERVOLTAGE (LVW)
– OVERVOLTAGE(FAULT)
– THERMAL PROTECTION (FAULT)
RESET FUNCTION
IGNITION COMPARATOR
REVERSE BATTERY AND LOAD DUMP
PROTECTION
THERMAL SHUTDOWN
DESCRIPTION
The L4953K contains a triple voltage regulator
and a power switch.
The IC includes a monitoring circuit to warn if a
BLOCK DIAGRAM
Multiwatt 15
ORDERING NUMBER: L4953K
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
AND REV
BATT PROT
3
SIG GND
1
EN 5V
12
STCAP
2
EN 8.25V
15
EN 16V
5
IGN INP
PROT
5V, 100mA
REGULATOR
STAND-BY
5V, 1000mA
REGULATOR
SWITCHED
11
STAND-BY 5V
9
OUT 5V
8.25V, 500mA
REGULATOR
SWITCHED
10
OUT 8.25V
16V, 1.5A
VOLTAGE CLAMP
SWITCHED
4
OUT 16V
VCAP
REF Vref1 LVW THRESHOLD
GEN _{Vref2 Reset THRESHOLD}
IGNITION THRESHOLD
OVERVOLTAGE
UNDERVOLTAGE
THERMAL PROT
RESET
POW GND
8
D94AU213B
6
IGN OUT
13
LVW/FAULT
14
RESET
June 2000
1/8
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.