L4946 datasheet(1/9 Pages) STMICROELECTRONICS

Part #	L4946

Description	QUAD VOLTAGE REGULATOR WITH INHIBIT AND RESET

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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L4946

QUAD VOLTAGE REGULATOR WITH INHIBIT AND RESET

4 OUTPUTS: 10V (125mA); 8V (250mA); 5V

(200mA); 5V (100mA)

10V AND 5V (100mA) OUTPUT ARE LOW

DROP

5V (100mA) ST-BY OUTPUT VOLTAGE

EARLY WARNING OUTPUT FOR SUPPLY

UNDERVOLTAGE (LVW)

THERMAL

SHUTDOWN

AND

CURRENT

LIMITATION (FOLDBACK)

REVERSE BATTERY AND LOAD DUMP

PROTECTION

INHIBIT (ON/OFF) AND RESET FUNCTIONS

DESCRIPTION

The L4946 is a quad output low drop voltage

regulator. The four outputs are a low drop 10V at

125mA (VO1), a 8V at 250mA (VO2), a 5V at

200mA (VO3) and a low drop 5V st-by line at

100mA (VO4).

The IC includes a monitoring circuit to warn if a

low voltage or no voltage condition is occurring.

VO1,2,3 are off during st-by mode.

The STCAP pin allows the battery voltage to de-

cay slowly giving the

µP time to store data. This

IC is designed for supplying microcomputer con-

trolled systems specially in automotive applica-

tions.

June 2000

®

BLOCK DIAGRAM

Multiwatt 11

ORDERING NUMBER: L4946

MULTIPOWER BCD TECHNOLOGY

L4946

125mA

250mA

200mA

1/9

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