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SP6681EU/TR Datasheet

  • SP6681EU/TR

  • High Efficiency Boost Charge Pump Regulator

  • 126.75KB

  • 10頁

  • SIPEX

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廬
SP6681
PRELIMINARY INFORMATION
High Efficiency Boost Charge Pump Regulator
FEATURES
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Ideal for Li Ion or 3V to 5V Conversion
Low Profile, Inductorless Regulator
Up To 96% Power Efficiency
+2.7V to +5.5V Input Voltage Range
5.0V, 50mA Output, 4% Accuracy
Low EMI Design
Low Quiescent Current: 175碌A(chǔ)
Low Shutdown Current: 4碌A(chǔ)
Optional External Clock: 32.768kHz
Thermal Shutdown Protection
Programmable Frequencies:
8.192kHz, 32.768kHz, or 262.14kHz
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Internal Oscillator: 16kHz or 130kHz,
when CLK Pin Is Held High
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Ultra small 10-Pin MSOP Package
APPLICATIONS
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GSM SIM Card Power Supplies
3V to 5V Boost Applications
Li Ion to 5.0V Boost Applications
White LED Driver
Smart Card Readers
DESCRIPTION
The SP6681 is a charge pump ideal for converting a +3.6V Li-Ion battery input to a +5.0V
regulated output. An input voltage range of +2.7V to +5.5V is converted to a regulated output
of 5.0V. The SP6681 device will operate at three different switching frequencies correspond-
ing to three different output resistances and load current ranges. An external 32.768kHz
nominal clock signal is used to produce three synchronized pump frequencies through the use
an internal phase lock loop to drive the charge pump. Two control inputs can adjust the internal
pump frequency on the fly to 8.192kHz (f
INPUT
/ 4), 32.768kHz (f
INPUT
x 1), or 262.14kHz (f
INPUT
x 8). The charge pump configuration dynamically changes to optimize power efficiency. At
low input voltages the charge pump doubles the input while at higher inputs the output is 1.5
times the input. The SP6681 can deliver high power efficiencies up to 96% with low quiescent
currents from 175碌A(chǔ) to 800碌A(chǔ). The SP6681 is offered in a 10-Pin
碌SOIC
package.
2.2碌F
2.2碌F
CF1P
2
V
IN
CF1N
9
CF2P
10
7
CF2N
3
1
V
OUT
+5.0V output
SP6681
+3.6V
Lithium-Ion
Battery
4
4.7碌F
GND
C/4
Cx8
CLK
5 6
8
2.2碌F
*All Capacitors Are Ceramic
Rev:A Date: 11/20/03
SP6681 High Efficiency Boost Charge Pump Regulator
漏 Copyright 2002 Sipex Corporation
1

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