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L4953
MULTIFUNCTION VOLTAGE REGULATOR FOR CAR RADIO
L4953MULTIFUNCTION VOLTAGE REGULATOR FOR CAR RADIO
3 OUTPUTS:
10V (500mA); 5V (1A); 5V (100mA) STANDBY
OUT1 (10V) AND OUT2 (5V) WITH INDE-
PENDENT ENABLE CONTROL FOR STAND-
BY MODE
3A 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
DESCRIPTIONThe L4953 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)
L49532/6
ELECTRICAL CHARACTERISTICS (VS = 14V, Tamb = 25°C, unless otherwise specified.)5V STAND-BY OUTPUT VOLTAGE
5V/1000mA SWITCHED OUTPUT VOLTAGE
10V/500mA SWITCHED OUTPUT VOLTAGE
HIGH SIDE DRIVER WITH CLAMPED OUTPUT (16V)
L49533/6
ELECTRICAL CHARACTERISTICS (continued)FAULT
RESET
IGNITION
L49534/6
L49535/6
. consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is
granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are
subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products
are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
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L49536/6
