L5980TR 查看數據表（PDF） - STMicroelectronics

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L5980TR

0.7 A step-down switching regulator

STMicroelectronics 

L5980

0.7 A step-down switching regulator

Features

■ 0.7 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 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

Figure 1. Application circuit

VFQFPN8 3 x 3 mm

Description

The L5980 is step down switching regulator with

1 A (min.) current limited embedded power

MOSFET, so it is able to deliver in excess of 0.7 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 FVQFPN package with exposed pad allows

reducing the RthJA down to approximately

60 °C/W.

September 2008

Rev 3

1/37

www.st.com

37

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