L4953K

® L4953K MULTIFUNCTION VOLTAGE REGULATOR FOR CAR RADIO 3 OUTPUTS: 8.25V (500mA); 5V (1A); 5V (100mA) STANDBY OUT1 (8.25V) AND OUT2 (5V) WITH INDEPENDENT ENABLE CONTROL FOR STANDBY 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 DESCRIPTION The L4953K contains a triple voltage regulator and a power switch. The IC includes a monitoring circuit to warn if a BLOCK DIAGRAM VS 7 LOAD DUMP AND REV BATT PROT SIG GND 3 5V, 100mA REGULATOR STAND-BY 5V, 1000mA REGULATOR SWITCHED 11 Multiwatt 15 ORDERING NUMBER: L4953K 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 hold enough energy for the 5V Stand-by line to allow the µP to store data. STAND-BY 5V 9 OUT 5V EN 5V STCAP EN 8.25V 1 12 8.25V, 500mA REGULATOR SWITCHED 10 OUT 8.25V 2 16V, 1.5A VOLTAGE CLAMP SWITCHED 4 OUT 16V EN 16V 15 VCAP REF GEN Vref1 LVW THRESHOLD Vref2 Reset THRESHOLD IGNITION THRESHOLD OVERVOLTAGE UNDERVOLTAGE THERMAL PROT RESET IGN INP 5 PROT POW GND 8 6 D94AU213B 13 LVW/FAULT 14 RESET IGN OUT June 2000 1/8 This is advanced information on a new product now in development or undergoing evaluation. Details are subject to chang...