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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

鈻?/div>

Internal Oscillator: 16kHz or 130kHz,

when CLK Pin Is Held High

鈻?/div>

Ultra small 10-Pin MSOP Package

APPLICATIONS

鈻?/div>

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

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

1

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