L6920DB Просмотр технического описания (PDF) - STMicroelectronics

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L6920DB

Synchronous rectifier step up converter

STMicroelectronics 

L6920DB

Synchronous rectifier step up converter

General features

■ 0.8V start up input voltage

■ Up to 5.5V operating input voltage

■ Internal synchronous rectifier

■ Adjustable output voltage from 1.8V

■ 3.3V and 5V fixed output voltages

■ Low battery voltage detection

■ Reverse battery protection

■ 750mA input current limit

■ Switching frequency up to 1MHz

■ 1.23V reference voltage available

Applications

■ Conversion from 1 to 3 alkaline,

■ NiMH, NiCd battery cells or 1 lithium ION

■ PDA and handheld instruments

■ Digital cameras

■ Cellular phones

■ GPS

■ Distributed power

Application circuit

MSOP8

Description

The L6920DB is a high efficiency monolithic step

up switching converter IC especially designed for

battery powered application.

Package is MSOP8 in order to minimize PCB

space. It requires only three external components

to realize the conversion from the battery voltage

to the selected output voltage.

The minimum output voltage is 1.8V: suitable to

supply the most advanced ASIC and µP.

High switching frequency allows for a low profile,

small sized inductor and output capacitor to be

used.

Reference voltage, low battery detection and

Shutdown are provided together with over current.

L6920DB

3.3V

October 2006

Rev 5

1/16

www.st.com

16

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