L5985 查看數據表（PDF） - STMicroelectronics

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L5985

2A step-down switching regulator

STMicroelectronics 

L5985

2A step-down switching regulator

Features

■ 2A 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

VFQFPN8 3x3

Description

The L5985 is a step down switching regulator with

2.5A current limited embedded power MOSFET,

so it is able to deliver up to 2A 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 for buses staring from

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.

October 2007

Rev 2

1/36

www.st.com

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