L7981 datasheet(1/44 Pages) STMICROELECTRONICS

部件名	L7981

功能描述	3 A step-down switching regulator

PDF	44 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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1 / 44 page

July 2010

Doc ID 15182 Rev 3

1/44

44

L7981

3 A step-down switching regulator

Features

■ 3 A DC output current

■ 4.5 V to 28 V input voltage

■ Output voltage adjustable from 0.6 V

■ 250 kHz switching frequency, programmable

up to 1 MHz

■ Internal soft-start and enable

■ Low dropout operation: 100% duty cycle

■ Voltage feed-forward

■ Zero load current operation

■ Overcurrent and thermal protection

■ VFQFPN3x3-8L and HSOP8 package

Applications

■ Consumer:

STB, DVD, DVD recorder, car audio, LCD TV

and monitors

■ Industrial:

PLD, PLA, FPGA, chargers

■ Networking: XDSL, modems, DC-DC modules

■ Computer:

Optical storage, hard disk drive, printers,

audio/graphic cards

■ Suitable for LED driving

Description

The L7981 is a step down switching regulator with

3.7 A (minimum) current limited embedded power

MOSFET, so it si able to deliver up to 3 A current

to the load depending on the application

conditions.

The input voltage can range from 4.5 V to 28 V,

while the output voltage can be set starting from

0.6 V to VIN.

Requiring a minimum set of external components,

the device includes an internal 250 kHz switching

frequency oscillator that can be externally

adjusted up to 1 MHz.

The QFN and the HSOP packages with exposed

pad allow reducing the RthJA down to 60°C/W and

40°C/W respectively.

Figure 1.

Application circuit

HSOP8 exposed pad

VFQFPN8 3x3

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More results

L7981 数据表(PDF) 1 Page - STMicroelectronics

L7981 数据表(HTML) 1 Page - STMicroelectronics

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