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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L4954

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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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