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STMicroelectronics - QUAD MULTIFUNCTION VOLTAGE REGULATOR FOR CAR RADIO

Numéro de référence L4954
Description QUAD MULTIFUNCTION VOLTAGE REGULATOR FOR CAR RADIO
Fabricant STMicroelectronics 
Logo STMicroelectronics 





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L4954 fiche technique
® 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.
June 2000
VS
STCAP
RESET
LVWarn
EN1
EN2
EN3
GND
VOLTAGE
REFERENCE
CURRENT
LIMIT
RESET
LVW
OUTPUT
CONTROL
THERMAL
SHUTDOWN
OVERVOLTAGE
PROTECTION
REG1
10V, 40mA
REG2
8.5V, 175mA
REG3
5V, 650mA
REG4
5V, 100mA
HSD1
2.0A
HSD2
0.3A
HSD3
0.3A
10V-REG1
8.5V-REG2
5V-REG3
5V-REG4-STBY
HSD1
HSD2
HSD3
D95AU346
1/7

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