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SP6645 Datasheet

  • SP6645

  • Single/Dual Alkaline Cell, High Efficiency Boost DC-DC Regul...

  • 201.56KB

  • 15頁

  • SIPEX

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SP6644/6645
Single/Dual Alkaline Cell, High Efficiency
Boost DC-DC Regulator
鈻?/div>
90mA Output Current at 1.3V Input
鈻?/div>
190mA Output Current at 2.6V Input
鈻?/div>
+2V to +5.5V Output Range
鈻?/div>
0.88V Guaranteed Start-Up
鈻?/div>
92% High Efficiency
鈻?/div>
1.6碌A(chǔ) Quiescent Supply Current at V
BATT
鈻?/div>
Reverse Battery Protection
鈻?/div>
Internal Synchronous Rectifier
鈻?/div>
5nA Logic Controlled Shutdown Current
From V
BATT
鈻?/div>
Low-Battery Detection Active LOW Output
鈻?/div>
Small 8 Pin MSOP Package
鈻?/div>
Flexibility to Optimize Inductor Type with
Programmable Peak Current Control
鈻?/div>
No External FETs
V B AT 1
B AT T L 0 2
RLIM 3
SHDN 4
SP6644
SP6645
8 Pin MSOP
8
V
OUT
7
LX
6
GND
4
FB
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鈩?synchronous rectifier, a 0.5鈩?/div>
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
22碌H
0.7A
0.88V to
3.3V Input
47碌F
R
LIM
V
BATT
LX
V
OUT
+3.3V
OUT
SP6644
SP6645
47碌F
BATTLO
SHDN
GND
FB
Rev:B Date 4/13/04
SP6644/6645 High Efficiency Boost Regulator
漏 Copyright 2004 Sipex Corporation
1

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