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SP6644EU-L Datasheet, PDF (1/15 Pages) Sipex Corporation – Single/Dual Alkaline Cell, High Efficiency Boost DC-DC Regulator | |||
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SP6644/6645
Single/Dual Alkaline Cell, High Efficiency
Boost DC-DC Regulator
â 90mA Output Current at 1.3V Input
â 190mA Output Current at 2.6V Input
â +2V to +5.5V Output Range
â 0.88V Guaranteed Start-Up
â 92% High Efficiency
â 1.6µA Quiescent Supply Current at VBATT
â Reverse Battery Protection
â Internal Synchronous Rectifier
â 5nA Logic Controlled Shutdown Current
From VBATT
â 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
â Small 8 Pin MSOP Package
â No External FETs
â 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 0.8⦠synchronous rectifier, a 0.5â¦
N-channel MOSFET power switch, an internal voltage reference, circuitry for pulse-
frequency-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
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