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L4953K
MULTIFUNCTION VOLTAGE REGULATOR FOR CAR RADIO
L4953KMULTIFUNCTION VOLTAGE REGULATOR FOR CAR RADIO
3 OUTPUTS:
8.25V (500mA); 5V (1A); 5V (100mA)
STANDBY
OUT1 (8.25V) AND OUT2 (5V) WITH INDE-
PENDENT ENABLE CONTROL FOR STAND-
BY MODE
1.5A HIGH SIDE DRIVER WITH CLAMPED
OUTPUT (16V)
LOGIC OUTPUT FOR:
– SUPPLY UNDERVOLTAGE (LVW)
– OVERVOLTAGE (FAULT)
– THERMAL PROTECTION (FAULT)
RESET FUNCTION
IGNITION COMPARATOR
REVERSE BATTERY AND LOAD DUMP
PROTECTION
THERMAL SHUTDOWN
DESCRIPTIONThe L4953K contains a triple voltage regulator
and a power switch.
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 sup-
ply capacitor that will hold enough energy for the
5V Stand-by line to allow the μP to store data.
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
THERMAL DATA
PIN CONNECTION (Top view)
L4953K2/8
ELECTRICAL CHARACTERISTICS (VS = 14V, Tamb = 25°C, unless otherwise specified.)5V STAND-BY OUTPUT VOLTAGE
5V/1000mA SWITCHED OUTPUT VOLTAGE
8.25V/500mA SWITCHED OUTPUT VOLTAGE
HIGH SIDE DRIVER WITH CLAMPED OUTPUT (16V)
L4953K3/8
ELECTRICAL CHARACTERISTICS (continued)LVW/FAULT (referred to VS)
RESET (referred to 5V st-by)
IGNITION
PIN 1: EN 5V
PIN 2: EN 8.25V
PIN 4: OUT 16V
CIRCUIT CONFIGURATION - PIN EQUIVALENT CIRCUITS
L4953K4/8
PIN 5: ING INP
PIN 6: IGN OUT
PIN 7: VS
PIN 9: OUT 5V
PIN 10: OUT 8.25V
PIN 11: STAND-BY 5V
L4953K5/8
PIN 12: ST-CAP
PIN 13: LVW / FAULT
PIN 14: RESET
PIN 15: EN 16V
L4953K6/8
