l4954 STMicroelectronics, l4954 Datasheet
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l4954
Manufacturer Part Number
l4954
Description
Quad Multifunction Voltage Regulator For Car Radio
Manufacturer
STMicroelectronics
Datasheet
1.L4954.pdf
(7 pages)
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DESCRIPTION
L4954 is a quad output voltage regulator and a
BLOCK DIAGRAM
June 2000
10V (40mA); 8.5V (175mA); 5V (650mA);
5V (100mA) STANDBY
LOW DROPOUT OUTPUTS
2A (HSD1), 0.3A (HSD2 & HSD3)
TORS ARE REQUIRED
PUT PINS:
EN1 FOR REG1, REG2, REG3 AND HSD1,
EN2 FOR HSD2, AND EN3 FOR HSD3
VOLTAGE: (LVWARN, RESET)
TAGE SHUTDOWN
4 REGULATORS
10V AND 5V STAND BY REGULATORS ARE
3 HIGH SIDE DRIVERS:
NO EXTERNAL CHARGE PUMP CAPACI-
STAND BY MODE CONTROLLED BY 3 IN-
INDIVIDUAL THERMAL SHUTDOWN
LOGIC OUTPUTS FOR SUPPLY UNDER-
INDEPENDENT CURRENT LIMITING
OVERVOLTAGE SHUTDOWN
SHORT CIRCUIT PROTECTION
LOAD DUMP PROTECTION AND OVERVOL-
LVWarn
STCAP
RESET
GND
EN1
EN2
EN3
V S
REFERENCE
OVERVOLTAGE
VOLTAGE
CURRENT
PROTECTION
VOLTAGE REGULATOR FOR CAR RADIO
SHUTDOWN
RESET
CONTROL
THERMAL
LIMIT
LVW
OUTPUT
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 generated at REG4’s decay.
External protection must be provided for reverse
battery protection.
8.5V, 175mA
10V, 40mA
5V, 650mA
5V, 100mA
REG1
REG2
REG3
REG4
HSD1
HSD2
HSD3
2.0A
0.3A
0.3A
QUAD MULTIFUNCTION
ORDERING NUMBER: L4954
Multiwatt15
10V-REG1
8.5V-REG2
5V-REG3
5V-REG4-STBY
HSD1
HSD2
HSD3
D95AU346
L4954
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