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SP6644

Sipex
Part Number SP6644
Manufacturer Sipex
Description High Efficiency Boost DC-DC Regulator
Published Jun 7, 2005
Detailed Description ® SP6644/6645 Single/Dual Alkaline Cell, High Efficiency Boost DC-DC Regulator ■ 90mA Output Current at 1.3V Input ■ ...
Datasheet PDF File SP6644 PDF File

SP6644
SP6644

Overview
® SP6644/6645 Single/Dual Alkaline Cell, High Efficiency Boost DC-DC Regulator ■ 90mA Output Current at 1.
3V Input ■ 190mA Output Current at 2.
6V Input ■ +2V to +5.
5V Output Range ■ 0.
88V Guaranteed Start-Up ■ 92% High Efficiency ■ 1.
6µA Quiescent Supply Current at VBATT ■ Reverse Battery Protection ■ Internal Synchronous Rectifier ■ 5nA Logic Controlled Shutdown Current From VBATT ■ Low-Battery Detection Active LOW Output VBAT 1 BATTL0 2 RLIM 3 SHDN 4 SP6644 SP6645 8 Pin MSOP 8 V OUT 7 LX 6 GND 4 FB Now Available in Lead Free Packaging ■ Small 8 Pin MSOP Package ■ No External FETs ■ Flexibility to Optimize Inductor Type with Programmable Peak Current Control DESCRIPTION The SP6644/6645 devices are high-efficiency, low-power step-up DC-DC converters ideal for single or dual alkaline cell applications such as pagers, remote controls, pointing devices, medical monitors, and other low-power portable end products.
Designers can control the SP6644 device with an active LOW shutdown input.
The SP6644 device features an active low output for batteries below +1.
0V.
The SP6645 device features an active low output for batteries below +2.
0V.
Both devices contain a 0.
8Ω synchronous rectifier, a 0.
5Ω N-channel MOSFET power switch, an internal voltage reference, circuitry for pulsefrequency-modulation, and an under voltage comparator.
The output voltage for the SP6644/6645 devices is preset to +3.
3V + 4% or can be adjusted from +2V to +5.
5V by manipulating two external resistors TYPICAL APPLICATION CIRCUIT 0.
88V to 3.
3V Input 47µF 22µH 0.
7A VBATT LX RLIM VOUT SP6644 SP6645 SHDN GND FB 47µF +3.
3VOUT BATTLO Date: 11/30/04 SP6644/6645 High Efficiency Boost Regulator 1 © Copyright 2004 Sipex Corporation These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied.
Exposure to absolute maximum rating conditions for extended periods...


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