L4972A Ver la hoja de datos (PDF) - STMicroelectronics

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Fabricante

L4972A

2A SWITCHING REGULATOR

STMicroelectronics 

L4972A

2A SWITCHING REGULATOR

1 Features

■ 2A 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

HYSTERETIC TURN-ON

■ PWM LATCH FOR SINGLE PULSE PER

PERIOD

■ VERY HIGH EFFICIENCY

■ SWITCHING FREQUENCY UP TO 200KHz

■ THERMAL SHUTDOWN

■ CONTINUOUS MODE OPERATION

2 Description

The L4972A is a stepdown monolithic power

switching regulator delivering 2A at a voltage vari-

able from 5.1 to 40V.

Realized with BCD mixed technology, the device

Figure 2. Block Diagram

Figure 1. Packages

PowerDIP20 (16+2+2)

Table 1. Order Codes

Part Number

L4972A

L4972AD

L4972AD013TR

SO20

Package

DIP20 (16+2+20)

SO20

SO20 in Tape & Reel

uses a DMOS output transistor to obtain very high

efficiency and very fast switching times. Features

of the L4972 include reset and power fail for micro-

processors, feed forward line regulation, soft start,

limiting current and thermal protection. The device

is mounted in a Powerdip 16 + 2 + 2 and SO20

large plastic packages and requires few external

components. Efficient operation at switching fre-

quencies up to 200KHz allows reduction in the

size and cost of external filter component.

May 2005

Rev. 3

1/22

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