SGS Thomson Microelectronics L4953G Datasheet
L4953G
MULTIFUNCTIONVOLTAGE 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)
LOGICOUTPUT FOR:
– SUPPLYUNDERVOLTAGE (LVW)
– OVERVOLTAGE
– THERMAL PROTECTION
RESETFUNCTION
IGNITIONCOMPARATOR
REVERSE BATTERY AND LOAD DUMP
PROTECTION
THERMALSHUTDOWN
DESCRIPTION
The L4953G contains a triple voltage regulator
and a power switch.
BLOCK DIAGRAM
The IC includes a monitoring circuit to warn if a
low voltageor no voltage conditionis 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-byline to allow the µP tostore data.
Multiwatt15
7
V
POW GND
EN 5V
STCAP
EN 9.2V
EN 16V
IGN INP
SIG GND
S
3
1
12
2
15
5
8
D97AU579
LOAD DUMP
VCAP
Vref1 LVW THRESHOLD
REF
GEN
Vref2 ResetTHRESHOLD
IGNITION THRESHOLDPROT
IGN OUT LVW/FAULT RESET
5V,
100mA
REGULATOR
STAND-BY
5V,
1000mA
REGULATOR
SWITCHED
9.2V,
500mA
REGULATOR
SWITCHED
16V,
VOLTAGE
SWITCHED
2A
CLAMP
OVERVOLTAGE
UNDERVOLTAGE
THERMAL
RESET
PROT
14136
11
9
10
4
STAND-BY 5V
OUT 5V
OUT 9.2V
OUT 16V
April 1999
This is preliminary information on a newproduct now in development.Details are subjectto change without notice.
1/6
L4953G
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
SDC
V
STR
I
O
T
op
T
stg
PIN CONNECTION (Topview)
DC Operating Supply Voltage –0.6 to 28 V
Transient Supply Voltage 50 V
Output Current internally limited
Operating TemperatureRange –40 to 85 °C
Storage Temperature –55 to 150 °C
TAB CONNECTED TO PIN 8
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
D97AU580
EN 16V
RESET
LVW/FAULT
STCAP
STBY5V
OUT 9.2V
OUT 5V
PGND
V
S
IGNOUT
IGNINP
OUT 16V
SGND
EN 9.2V
EN 5V
THERMAL DATA
Symbol Parameter Value Unit
R
th j-case
Thermal Resistance Junction-case 2 °C/W
2/6
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