L4973D3 datasheet(1/16 Pages) STMICROELECTRONICS

Il numero della parte	L4973D3

Spiegazioni elettronici	3.5A STEP DOWN SWITCHING REGULATOR

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

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L4973V3.3 - L4973V5.1

L4973D3.3 - L4973D5.1

3.5A STEP DOWN SWITCHING REGULATOR

UPTO 3.5ASTEP DOWN CONVERTER

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 (100

µA Typ. at VCC = 24V)

PROTECTION AGAINST FEEDBACK DIS-

CONNECTION

THERMAL SHUTDOWN

OUTPUT OVERVOLTAGE PROTECTION

SOFT START FUNCTION

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

April 2000

®

L4973

V

CC (8V to 55V)

C

IN

C2

ROSC

COSC

D1

L1

COUT

VO(3.3V or 5.1V)

CBOOT

4,5,6,

13,14,15

7

9

8

1

11

3

10

D97IN554A

17

RCOMP

CCOMP

CSS

2

16

12

TYPICAL APPLICATION CIRCUIT (POWERDIP)

POWERDIP (12+3+3)

SO20(12+4+4)

ORDERING NUMBERS:

L4973V3.3 (Powerdip)

L4973D3.3

(SO20)

L4973V5.1 (Powerdip)

L4973D5.1

(SO20)

MULTIPOWER BCD TECHNOLOGY

1/16

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