L5981 datasheet(1/37 Pages) STMICROELECTRONICS

部件名	L5981

功能描述	1A step-down switching regulator

PDF	37 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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1 / 37 page

October 2007

Rev 2

1/37

37

L5981

1A step-down switching regulator

Features

1A DC output current

2.9V to 18V input voltage

Output voltage adjustable from 0.6V

250kHz switching frequency, programmable

up to 1MHz

Internal soft-start and inhibit

Low dropout operation: 100% duty cycle

Voltage feed-forward

Zero load current operation

Over current and thermal protection

VQFN3x3-8L package

Applications

Consumer:

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

and monitors

Industrial:

Chargers, car battery, PLD, PLA, FPGA

Networking: XDSL, modems, DC-DC modules

Computer:

Optical storage, hard disk drive, printers,

audio/graphic cards

Figure 1.

Application circuit

Description

The L5981 is step down switching regulator with

1.5A current limited embedded power MOSFET,

so it is able to deliver in excess of 1A DC current

to the load depending on the application

condition.

The input voltage can range from 2.9V to 18V,

while the output voltage can be set starting from

0.6V to VIN. Having a minimum input voltage of

2.9V, the device is suitable also for 3.3V bus.

Requiring a minimum set of external components,

the device includes an internal 250kHz switching

frequency oscillator that can be externally

adjusted up to 1MHz.

The QFN package with exposed pad allows

reducing the RthJA down to approximately

60°C/W.

VFQFPN8 3x3

L5981

www.st.com

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