L5987A(2008) 데이터 시트보기 (PDF) - STMicroelectronics

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L5987A
(Rev.:2008)

3 A step-down switching regulator

STMicroelectronics 

L5987

3 A step-down switching regulator

Preliminary Data

Features

■ 3 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

■ 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

■ LED driving

VFQFPN8 3x3 mm HSOP8 exposed pad

Description

The L5987 is a step down switching regulator with

3.5 A (minimum) current limited embedded power

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

to the load depending on the application

conditionals Section 5.7 and Section 5.8).

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 QFN and the HSOP package with exposed

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

and 40 °C/W respectively.

Figure 1. Application circuit

August 2008

Rev 1

This is preliminary information on a new product now in development or undergoing evaluation.

Details are subject to change without notice.

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