Datasheet > L5970D_0710

L5970D_0710

更新时间： 2024-10-02 03:49:47

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		稳压器开关
页数	文件大小	规格书
16页	271K
描述
Up to 1A step down switching regulator

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L5970D_0710 数据手册

L5970D

Up to 1A step down switching regulator

Features

■ Up to 1A output current

■ Operating input voltage from 4.4V to 36V

■ 3.3V / ( 2%) reference voltage

SO8

■ Output voltage adjustable from 1.2V to 35V

■ Low dropout operation: 100% duty cycle

■ 250KHz Internally fixed frequency

■ Voltage feedforward

Description

The L5970D is a step down monolithic power

switching regulator capable to deliver up to 1A at

output voltages from 1.2V to 35V.

■ Zero load current operation

■ Internal current limiting

The device uses an internal P-Channel D-MOS

transistor (with a typical Rdson of 250mΩ) as

switching element to minimize the size of the

external components.

■ Inhibit for zero current consumption

■ Synchronization

■ Protection against feedback disconnection

■ Thermal shutdown

An internal oscillator fixes the switching frequency

at 250KHz.

Applications

Having a minimum input voltage of 4.4V only, it is

particularly suitable for 5V bus, available in all

computer related applications.

■ Consumer: STB, DVD, TV, VCR, car radio,

LCD monitors

Pulse by pulse current limit with the internal

frequency modulation offers an effective constant

current short circuit protection.

■ Networking: XDSL, modems, DC-DC modules

■ Computer: printers, audio/graphic cards,

optical storage, hard disk drive

■ Industrial: changers, car battery, DC-DC

converters

Figure 1. Test application circuit

VREF

L1 33µH

3.3V

VOUT=3.3V

OUT

VIN = 4.4V to 35V

VCC

5.6K

L5970D

STPS2L40U

SYNC.

COMP

100µF

10V

10µF

35V

22nF

INH.

GND

3.3K

220pF

CERAMIC

4.7K

D98IN954C

October 2007

Rev 16

1/16

www.st.com

12 3 4 5 6 7...16

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