L4973D5.1 데이터 시트보기 (PDF) - STMicroelectronics

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L4973D5.1

3.5A STEP DOWN SWITCHING REGULATOR

STMicroelectronics 

L4973V3.3 - L4973V5.1

®

L4973D3.3 - L4973D5.1

3.5A STEP DOWN SWITCHING REGULATOR

UPTO 3.5ASTEP DOWNCONVERTER

OPERATING INPUT VOLTAGE FROM 8V TO

55V

3.3V AND 5.1V (±1%) FIXED OUTPUT, AND

ADJUSTABLE OUTPUTS FROM:

0V TO 50V (3.3V type)

5.1V TO 50V (5.1 type)

FREQUENCY ADJUSTABLE UP TO 300KHz

VOLTAGE FEED FORWARD

ZERO LOAD CURRENT OPERATION (min

1mA)

INTERNAL CURRENT LIMITING (PULSE BY

PULSE AND HICCUP MODE)

PRECISE 5.1V (1.5%) REFERENCE VOLT-

AGE EXTERNALLY AVAILABLE

INPUT/OUTPUT SYNCHRONIZATION FUNC-

TION

INHIBIT FOR ZERO CURRENT CONSUMP-

TION (100µA Typ. at VCC = 24V)

PROTECTION AGAINST FEEDBACK DIS-

CONNECTION

THERMAL SHUTDOWN

OUTPUT OVERVOLTAGE PROTECTION

SOFT START FUNCTION

TYPICAL APPLICATION CIRCUIT (POWERDIP)

MULTIPOWER BCD TECHNOLOGY

POWERDIP (12+3+3)

SO20(12+4+4)

ORDERING NUMBERS:

L4973V3.3 (Powerdip)

L4973D3.3 (SO20)

L4973V5.1 (Powerdip)

L4973D5.1 (SO20)

DESCRIPTION

The L4973 is a step down monolithic power

switching regulator delivering 3.5A at fixed volt-

ages of 3.3V or 5.1V and using a simple external

divider output adjustable voltage up to 50V.

Realized in BCD mixed technology, the device

VCC (8V to 55V)

CIN

ROSC

C2

78

10 12

CBOOT

L4973

9

1

4,5,6,

3

L1

13,14,15 16 17 11 2

COSC

RCOMP

CSS

D1

CCOMP

VO(3.3V or 5.1V)

COUT

D97IN554A

April 2000

1/16

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