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L4953G
MULTIFUNCTION VOLTAGE REGULATOR FOR CAR RADIO
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L4953G
MULTIFUNCTION VOLTAGE REGULATOR FOR CAR RADIO
3 OUTPUTS:
9.2V (500mA);
5V(1A);
5V (1 00mA) STANDBY
OUT1 (9.2V) AND OUT2 (5V) WITH INDE-
PENDENT ENABLE CONTROL FOR STAND-
BY 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
TH ERMAL SHUTDOWN
DESCRIPTION
The L4953G contains a triple voltage regulator
and a power switch.
BLOCK DIAGRAM
PRELIMINARY DATA
M ultiwatt1 5
The IC includes a monitoring circuit to wa.rn if a
low voltage or no voltage condition is occurmg.
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 " to store data.
D97AU579 criarr
Vs A f - 5v, 100mA 11 I
REGULATOR STAND-BY 5V
STAND-BY
LOAD DUMP
3 5v. 1000mA 9
POW GND .1. REGULATOR OUT 5V
SWITCHED
1 Is I
EN 5V J
12 / 9.2V, 500mA 10
STCAP REGULATOR OUT 9.2V
SWITCHED
2 Is I
EN 9.2V -r
/ 16V, 2A 4
VOLTAGE CLAMP OUT 16V
SWITCHED
15 Is I
EN 16V -= VCAP
/ OVERVOLTAGE
REF Vref1 LVW THRESHOLD UNDERVOLTAGE
GEN Vref2 Reset THRESHOLD THERMAL PROT
5 RESET
IGN INP PROT IGNITION THRESHOLD
SIG GND
LVW/FAU LT RESET
April 1999
This is preliminary information on a new product now in development. Details are subject to change without notice.
L4953G
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
l/soc DC Operating Supply Voltage -0.6 to 28 V
VSTR Transient Supply Voltage 50 V
lo Output Current internally limited
Top Operating Temperature Range -40 to 85 °C
Tstg Storage Temperature -55 to 150 °C
PIN CONNECTION (Top view)
15 EN 16V
14 RESET
13 LVW/FAULT
12 STCAP
11 STBY5V
10 OUT 9.2V
9 OUT 5V
8 PGND
6 IGNOUT
5 IGNINP
4 OUT 16V
t)- 3 SGND
2 EN 9.2V
1 EN 5V
1 TAB CONNECTED TO PIN a D97AU580
THERMAL DATA
Symbol Parameter Value Unit
Rm j-case Thermal Resistance Junction-case 2 °CNV
2/6 gr,
