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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:
鈥?SUPPLY UNDERVOLTAGE (LVW)
鈥?OVERVOLTAGE
鈥?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
BLOCK DIAGRAM
VS
7
LOAD DUMP
AND REV
BATT PROT
POW GND
3
5V, 100mA
REGULATOR
STAND-BY
5V, 1000mA
REGULATOR
SWITCHED
11
Multiwatt 15
ORDERING NUMBER:
L4953
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
碌P
to store data.
STAND-BY 5V
9
OUT 5V
EN 5V
STCAP
EN 10V
1
12
10V, 500mA
REGULATOR
SWITCHED
10
OUT 10V
2
16V, 3A
VOLTAGE CLAMP
SWITCHED
4
OUT 16V
EN 16V
15
VCAP
REF
GEN
5
Vref1 LVW THRESHOLD
Vref2 Reset THRESHOLD
IGNITION THRESHOLD
OVERVOLTAGE
UNDERVOLTAGE
THERMAL PROT
RESET
IGN INP
PROT
SIG GND
8
6
D94AU053A
13
LVW/FAULT
14
RESET
IGN OUT
June 2000
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