L5981 datasheet(1/37 Pages) STMICROELECTRONICS

部件名	L5981

功能描述	1 A step-down switching regulator

PDF	37 Pages

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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1 / 37 page

September 2008

Rev 4

1/37

37

L5981

1 A step-down switching regulator

Features

■ 1 A DC output current

■ 2.9 V to 18 V input voltage

■ Output voltage adjustable from 0.6 V

■ 250 kHz switching frequency, programmable

up to 1 MHz

■ Internal soft-start and inhibit

■ Low dropout operation: 100 % duty cycle

■ Voltage feed-forward

■ Zero load current operation

■ Over current and thermal protection

■ VFQFPN8 3 mm x 3 mm package

Applications

■ Consumer: STB, DVD, DVD recorder, car

audio, LCD TV and monitors

■ Industrial: Chargers, PLD, PLA, FPGA

■ Networking: XDSL, modems, DC-DC modules

■ Computer: Optical storage, hard disk drive,

printers, audio/graphic cards

■ LED driving

Description

The L5981 is step down switching regulator with

1.5 A (min.) current limited embedded power

MOSFET, so it is able to deliver in excess of 1 A

DC current to the load depending on the

application condition.

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

while the output voltage can be set starting from

0.6 V to VIN. Having a minimum input voltage of

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

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 VFQFPN8 package with exposed pad allows

reducing the RthJA down to approximately

60 °C/W.

VFQFPN8 3 mm x 3 mm

Figure 1.

Application circuit

www.st.com

类似零件编号 - L5981

制造商	部件名	数据表	功能描述
STMicroelectronics	L5981	823Kb / 37P	1A step-down switching regulator 16-Oct-2007
STMicroelectronics	L5981TR	823Kb / 37P	1A step-down switching regulator 16-Oct-2007

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