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廬

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

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鈥檚 decay.

External protection must be provided for reverse

battery protection.

REG1

10V, 40mA

10V-REG1

REG2

8.5V, 175mA

8.5V-REG2

CURRENT

LIMIT

REG3

5V, 650mA

5V-REG3

RESET

LVWarn

RESET

LVW

REG4

5V, 100mA

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

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L4954相關(guān)型號(hào)PDF文件下載

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