L5970

更新时间： 2024-11-25 22:31:47

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
10页	140K
描述
UP TO 1A STEP DOWN SWITCHING REGULATOR

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中文翻译

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数据手册

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L5970 数据手册

L5970D

UP TO 1A STEP DOWN SWITCHING REGULATOR

■ UP TO 1A OUTPUT CURRENT

■ OPERATING INPUT VOLTAGE FROM 4.4V

TO 36V

■ 3.3V / (±2%) / REFERENCE VOLTAGE

■ OUTPUT VOLTAGE ADJUSTABLE FROM

1.2V TO 35V

■ LOW DROPOUT OPERATION: 100% DUTY

CYCLE

SO8

ORDERING NUMBERS: L5970D (SO8)

■ 250KHz INTERNALLY FIXED FREQUENCY

■ VOLTAGE FEEDFORWARD

■ ZERO LOAD CURRENT OPERATION

■ INTERNAL CURRENT LIMITING

■ INHIBIT FOR ZERO CURRENT

CONSUMPTION

■ SINCHRONIZATION

■ PROTECTION AGAINST FEEDBACK

DISCONNECTION

L5970D013TR (T&R)

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.

■ THERMAL SHUTDOWN

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 ex-

ternal components.

APPLICATIONS:

■ CONSUMER: STB, DVD, TV, VCR,CAR

RADIO, LCD MONITORS

■ NETWORKING: XDSL, MODEMS,DC-DC

MODULES

■ COMPUTER: PRINTERS, AUDIO/GRAPHIC

CARDS, OPTICAL STORAGE, HARD DISK

DRIVE

■ INDUSTRIAL: CHARGERS, CAR BATTERY

DC-DC CONVERTERS

An internal oscillator fixes the switching frequency

at 250KHz.

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

particularly suitable for 5V bus, available in all

computer related applications.

Pulse by pulse current limit with the internal fre-

quency modulation offers an effective constant

current short circuit protection.

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

CERAMIC

220pF

4.7K

D98IN954C

May 2003

1/10

12 3 4 5 6 7...10

中文翻译

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