SP6642 Sipex, SP6642 Datasheet

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SP6642

Manufacturer Part Number
SP6642
Description
Single Alkaline Cell / High Efficiency Step-Up DC-DC Converter
Manufacturer
Sipex
Datasheet
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 – 47 H Inductor
SP6642/6643APN/02
40mA Output Current for the SP6642/3
Single Cell to 2V to 5V Converter
High Efficiency: 81%
Twice the Output Current as the
Pin-to-Pin Compatible MAX1642/3
0.75V Start-up Voltage
SP6642/6643 Application Note
®
1
SP6642/3 40mA Output Application: Block Diagram
Single
Cell
High Current Output
Application Note:
SP6642/3
DC/DC Converter
SP6642/3
47 H
© Copyright 2000 Sipex Corporation
2 to 5V
Remotes,
Pagers,
Medical
Devices

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SP6642 Summary of contents

Page 1

... 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 – Inductor ...

Page 2

... V is set by Vin and Vout the charge L time set by the On-Time Constant specified in the SP6642/3 datasheet. Since L is the only factor changing, for a decrease 1/2, the peak current, di, will double. With a doubling of peak current, the output current the SP6642/3 can provide will double ...

Page 3

... SP6642 Efficiency vs. Output Current 100 Vin = 1.6V 40 Vin = 1.2V 30 Vin = 1.0V 20 Vin = 0.85V 10 0 0.01 0.1 1 Output Current (mA) Figure 1. 2.4V Sumida 47 H OUT 100 0.01 0.1 1 Output Current (mA) Figure 3. 3.3V Sumida 47 H OUT 100 Vin = 1.6V 40 Vin = 1.2V 30 Vin = 1.0V 20 Vin = 0.85V 10 0 0.01 0.1 1 Output Current (mA) Figure 5 ...

Page 4

... SP6642/6643APN/02 ORDERING INFORMATION Temperature Range - + +85 C SP6642/6643 Application Note 4 Package Types 8-pin SOIC 8-pin SOIC SP6642 Evaluation Board © Copyright 2000 Sipex Corporation ...

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