SP6642UEB Ver la hoja de datos (PDF) - Signal Processing Technologies

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SP6642UEB

Application Note: High Current Output

Signal Processing Technologies 

SP6642/3

®

Application Note:

High Current Output

s 40mA Output Current for the SP6642/3

Single Cell to 2V to 5V Converter

s High Efficiency: 81%

s Twice the Output Current as the

Pin-to-Pin Compatible MAX1642/3

s 0.75V Start-up Voltage

SP6642/3 40mA Output Application: Block Diagram

Single

Cell

47µH

SP6642/3

DC/DC Converter

2 to 5V

Pagers,

Remotes,

Medical

Devices

Description

The SP6642/6643 devices are high-efficiency, low-power step-up DC-DC converters for +1V

inputs ideal for single alkaline cell applications such as pagers, remote controls, pointing

devices and other low-power portable products. This application note is for users like medical

devices, emergency lighting and others who need twice the output current than the datasheet

specified values for the SP6642/6643. Typically specified at 20mA for 3.3V out with a 1.2V

input, the SP6642 can actually output double the current if a lower value of inductor is selected.

SP6642/6643 Applications Schematic – 47µH Inductor

SP6642/6643APN/02

SP6642/6643 Application Note

1

© Copyright 2000 Sipex Corporation

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