L4954
DESCRIPTION
L4954 is a quad output voltage regulator and a BLOCK DIAGRAM
VS STCAP VOLTAGE REFERENCE
Multiwatt15
ORDERING NUMBER: L4954 three output high side driver. The IC includes monitoring circuitry to warn the microprocessor of a low voltage condition: the LVWarn, output, sensing the slow dropping of STCAP pins voltage, gives the microprocessor time to store data. A RESET output is generatedat REG4’s decay. External protection must be provided for reverse battery protection.
REG1 10V, 40m A
10V-REG1
REG2 8.5V, 175m A
8.5V-REG2
CURRENT LIMIT
REG3 5V, 650m A
5V-REG3
RESET LVWarn
RESET LVW
REG4 5V, 100m A
5V-REG4-STBY
EN1
OUTPUT CONTROL THERMAL SHUTDOWN OVERVOLTAGE PROTECTION
HSD1 2.0A HSD2 0.3A HSD3 0.3A
HSD1
EN2
HSD2
EN3 GND
HSD3
D95AU346
June 2000
1/7
ABSOLUTE MAXIMUM RATINGS
Symbol VS VS VS,ovs Vin V out Top Tstg Parameter DC Operating Supply Voltage Transient Supply Overvoltages, rise time = 10ms delay time = 115ms Overvoltage Shutdown Input Voltages...
