L4972AD datasheet(1/22 Pages) STMICROELECTRONICS

部件名	L4972AD

功能描述	2A SWITCHING REGULATOR

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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L4972A

May 2005

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

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.

2A SWITCHING REGULATOR

Figure 2. Block Diagram

Rev. 3

Figure 1. Packages

Table 1. Order Codes

Part Number

Package

L4972A

DIP20 (16+2+20)

L4972AD

SO20

L4972AD013TR

SO20 in Tape & Reel

PowerDIP20 (16+2+2)

SO20

类似零件编号 - L4972AD

制造商	部件名	数据表	功能描述
STMicroelectronics	L4972AD	339Kb / 23P	2A SWITCHINGREGULATOR Jun-2000

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