L4953K
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, 100m A REGULATOR STAND-BY 5V, 1000m A 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
OUT 5V
EN 5V STCAP EN 8.25V
1 12 8.25V, 500m A 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
PROT
POW GND
8 6
D94AU213B
13 LVW/FAULT
14 RESET
IGN OUT
June 2000
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