ST L4953G User Manual
®
L4953G
MULTIFUNCTION VOLTAGE 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)
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
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 supply capacitor that will h old enough energy for t he
5V Stand-by line to allow the µP to store data.
Multiwatt15
V
POW GND
EN 5V
STCAP
EN 9.2V
EN 16V
IGN INP
SIG GND
S
7
3
1
12
2
15
5
8
D97AU579
LOAD DUMP
PROT
5V, 100mA
REGULATOR
STAND-BY
5V, 1000mA
REGULATOR
SWITCHED
9.2V, 500mA
REGULATOR
SWITCHED
16V, 2A
VOLTAGE CLAMP
SWITCHED
VCAP
REF
Vref1 LVW THRESHOLD
GEN
Vref2 Reset THRESHOLD
IGNITION THRESHOLD
IGN OUT LVW/FAULT RESET
OVERVOLTAGE
UNDERVOLTAGE
THERMAL PROT
RESET
11
STAND-BY 5V
9
OUT 5V
10
OUT 9.2V
4
OUT 16V
14136
April 1999
This is preliminary information on a new product now in development. Details are subject to change without notice.
1/6
L4953G
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
SDC
V
STR
I
O
T
op
T
stg
DC Operating Supply Voltage –0.6 to 28 V
Transient Supply Voltage 50 V
Output Current internally limited
Operating Temperature Range –40 to 85
Storage Temperature –55 to 150
C
°
C
°
PIN CONNECTION
(Top view)
TAB CONNECTED TO PIN 8
15
14
13
12
11
10
EN 16V
RESET
LVW/FAULT
STCAP
STBY5V
OUT 9.2V
9
8
7
6
5
4
3
2
1
D97AU580
OUT 5V
PGND
V
S
IGNOUT
IGNINP
OUT 16V
SGND
EN 9.2V
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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