L4974 Просмотр технического описания (PDF) - STMicroelectronics

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L4974

3.5A SWITCHING REGULATOR

STMicroelectronics 

®

L4974A

3.5A SWITCHING REGULATOR

. 3.5A OUTPUT CURRENT

. 5.1V TO 40V OUTPUT VOLTAGE RANGE

. 0 TO 90% DUTY CYCLE RANGE

. INTERNAL FEED-FORWARD LINE REG.

. INTERNAL CURRENT LIMITING

. PRECISE 5.1V ± 2% ON CHIP REFERENCE

. RESET AND POWER FAIL FUNCTIONS

. INPUT/OUTPUT SYNC PIN

. UNDER VOLTAGE LOCK OUT WITH HYS-

TERETIC TURN-ON

. PWM LATCH FOR SINGLE PULSE PER PE-

RIOD

. VERY HIGH EFFICIENCY

. SWITCHING FREQUENCY UP TO 200KHz

. THERMAL SHUTDOWN

. CONTINUOUS MODE OPERATION

MULTIPOWER BCD TECHNOLOGY

POWERDIP (16 + 2 + 2)

ORDERING NUMBER : L4974A

DESCRIPTION

The L4974Aisa stepdownmonolithicpower switch-

ing regulator delivering 3.5A at a voltage variable

from 5.1 to 40V.

Realized with BCD mixed technology, the device

uses a DMOS output transistor to obtain very high

efficiency and very fast switching times. Features of

the L4974A include reset and power fail for micro-

processors, feed forward line regulation, soft start,

limiting current and thermal protection. The device

is mountedin a Powerdip16 + 2 + 2 plastic package

and requires few external components. Efficient

operation at switching frequencies up to 200KHz

allows reductionin the size and cost of externalfilter

component.

BLOCK DIAGRAM

June 2000

1/22

This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

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