SGS Thomson Microelectronics L4953 Datasheet
L4953
MULTIFUNCTIONVOLTAGE REGULATOR FOR CAR RADIO
3 OUTPUTS:
10V (500mA);5V (1A);5V (100mA)STANDBY
OUT1 (10V) AND OUT2 (5V) WITH INDEPENDENT ENABLE CONTROL FOR STANDBY MODE
3A HIGH SIDE DRIVER WITH CLAMPED
OUTPUT(16V)
LOGICOUTPUT FOR:
– SUPPLYUNDERVOLTAGE (LVW)
– OVERVOLTAGE
– THERMALPROTECTION
RESETFUNCTION
IGNITIONCOMPARATOR
REVERSE BATTERY AND LOAD DUMP
PROTECTION
THERMALSHUTDOWN
DESCRIPTION
The L4953 contains a triple voltage regulator and
a powerswitch.
The IC includes a monitoring circuit to warn if a
ORDERING NUMBER: L4953
low voltageor no voltageconditionis occuring.
In stand-by output is active as long as possible
even whenin thermalshutdown 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-byline toallow the µP to storedata.
Multiwatt 15
BLOCK DIAGRAM
POW GND
STCAP
EN 10V
EN 16V
IGN INP
SIG GND
June 2000
EN 5V
V
S
7
3
1
12
2
15
5
8
D94AU053A
LOAD
DUMP
AND
REV
BATT PROT
5V, 100mA
REGULATOR
STAND-BY
5V, 1000mA
REGULATOR
SWITCHED
10V, 500mA
REGULATOR
SWITCHED
16V, 3A
VOLTAGE
VCAP
Vref1 LVW THRESHOLD
REF
GEN
Vref2 Reset THRESHOLD
IGNITION THRESHOLDPROT
IGN OUT LVW/FAULT RESET
CLAMP
SWITCHED
OVERVOLTAGE
UNDERVOLTAGE
THERMAL
RESET
PROT
14136
11
9
10
4
STAND-BY 5V
OUT 5V
OUT 10V
OUT 16V
1/6
L4953
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
SDC
V
STR
I
O
T
op
T
stg
PIN CONNECTION (Topview)
DC Operating Supply Voltage –14 to28 V
Transient Supply Voltage 50 V
Output Current internally limited
Operating TemperatureRange –40 to85
Storage Temperature –55 to150
C
°
C
°
TAB CONNECTED TOPIN 8
15
14
13
12
11
10
EN 16V
RESET
LVW/FAULT
STCAP
STBY5V
OUT 8.25V
9
8
7
6
5
4
3
2
1
D94AU054B
OUT 5V
PGND
V
S
IGNOUT
IGNINP
OUT 16V
SGND
EN 8.25V
EN 5V
THERMAL DATA
Symbol Parameter Value Unit
Thermal Resistance Junction-case 2
2/6
R
th j-case
C/W
°
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