L4954 Datasheet, PDF (1/7 Pages) STMicroelectronics – QUAD MULTIFUNCTION VOLTAGE REGULATOR FOR CAR RADIO

®
L4954
QUAD MULTIFUNCTION
VOLTAGE REGULATOR FOR CAR RADIO
4 REGULATORS
10V (40mA); 8.5V (175mA); 5V (650mA);
5V (100mA) STANDBY
10V AND 5V STAND BY REGULATORS ARE
LOW DROPOUT OUTPUTS
3 HIGH SIDE DRIVERS:
2A (HSD1), 0.3A (HSD2 & HSD3)
NO EXTERNAL CHARGE PUMP CAPACI-
TORS ARE REQUIRED
STAND BY MODE CONTROLLED BY 3 IN-
PUT PINS:
EN1 FOR REG1, REG2, REG3 AND HSD1,
EN2 FOR HSD2, AND EN3 FOR HSD3
INDIVIDUAL THERMAL SHUTDOWN
LOGIC OUTPUTS FOR SUPPLY UNDER-
VOLTAGE: (LVWARN, RESET)
INDEPENDENT CURRENT LIMITING
OVERVOLTAGE SHUTDOWN
SHORT CIRCUIT PROTECTION
LOAD DUMP PROTECTION AND OVERVOL-
TAGE SHUTDOWN
DESCRIPTION
L4954 is a quad output voltage regulator and a
BLOCK DIAGRAM
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.
VS
STCAP
VOLTAGE
REFERENCE
REG1
10V, 40mA
REG2
8.5V, 175mA
10V-REG1
8.5V-REG2
CURRENT
LIMIT
REG3
5V, 650mA
5V-REG3
RESET
LVWarn
EN1
EN2
EN3
GND
RESET
LVW
OUTPUT
CONTROL
THERMAL
SHUTDOWN
OVERVOLTAGE
PROTECTION
REG4
5V, 100mA
HSD1
2.0A
HSD2
0.3A
HSD3
0.3A
5V-REG4-STBY
HSD1
HSD2
HSD3
D95AU346
June 2000
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