L5970D_07 datasheet(1/16 Pages) STMICROELECTRONICS

部件名	L5970D

功能描述	Up to 1A step down switching regulator

PDF	16 Pages

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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1 / 16 page

January 2007

Rev 14

1/16

16

L5970D

Up to 1A step down switching regulator

General features

■ 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

■ 250KHz Internally fixed frequency

■ Voltage feedforward

■ Zero load current operation

■ Internal current limiting

■ Inhibit for zero current consumption

■ Synchronization

■ Protection against feedback disconnection

■ Thermal shutdown

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: changers, car battery, DC-DC

converters

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.

The device uses an internal P-Channel D-MOS

transistor (with a typical Rdson of 250m

Ω) as

switching element to minimize the size of the

external components.

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

frequency modulation offers an effective constant

current short circuit protection.

SO8

www.st.com

Test application circuit

D98IN954C

8

2

4

5

1

7

L5970D

C1

10

µF

35V

CERAMIC

C2

100

µF

10V

VOUT=3.3V

VIN = 4.4V to 35V

R1

5.6K

R2

3.3K

R3

4.7K

C4

22nF

C3

220pF

3

6

D1

STPS2L40U

3.3V

INH.

SYNC.

COMP

VCC

VREF

OUT

FB

GND

L1 33

µH

类似零件编号 - L5970D_07

制造商	部件名	数据表	功能描述
STMicroelectronics	L5970D_0710	270Kb / 16P	Up to 1A step down switching regulator 16-Oct-2007

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