L4970A

10A SWITCHING REGULATOR

10A OUTPUT CURRENT

5.1V TO 40V OUTPUT VOLTAGE RANGE

0 TO 90% DUTY CYCLE RANGE

INTERNAL FEED-FORWARD LINE REGULA-

TION

INTERNAL CURRENT LIMITING

PRECISE 5.1V

± 2% ON CHIP REFERENCE

RESET AND POWER FAIL FUNCTIONS

SOFT START

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 500KHz

THERMAL SHUTDOWN

CONTINUOUS MODE OPERATION

DESCRIPTION

The L4970A is a stepdown monolithic power

switching regulator delivering 10A 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 L4970A include reset and power fail for mi-

croprocessors, feed forward line regulation, soft

start, limiting current and thermal protection. The

device is mounted in a 15-lead multiwatt plastic

power package and requires few external compo-

nents. Efficient operation at switching frequencies

up to 500KHz allows reduction in the size and

cost of external filter components.

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

June 2000

®

BLOCK DIAGRAM

Multiwatt15V

ORDERING NUMBER: L4970A

MULTIPOWER BCD TECHNOLOGY

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