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Mar28-08

SP4446 High Output Voltage Boost Regulator, LCD Bias Regulator

© 2008 Exar Corporation

SP4446

FEATURES

■ High Output Voltage: Up to 30V

■ High Efficiency

■ Low Quiescent Current: ~20uA

■ Single Battery Cell Operation

■ Programmable Output Voltage

■ 1Ω Switch (150mV at 150mA)

■ Lead Free, RoHS Compliant

Package: 5 Pin SOT-23

High Output Voltage Boost Regulator

LCD Bias Regulator

The SP4446 is a micro power Boost Regulator in a 5-lead SOT-23 package. It is a current

limited, fixed off-time regulator configured for use in boost mode applications. The operating

voltage can be less than 3Volts and is capable of generating voltages as high as 30Volts.

The SP4446 is available in a Lead Free, RoHS compliant package and permits the construction

of complete regulators that occupy < 0.2 square inches of board space.

TYPICAL APPLICATION SCHEMATIC

5

4

1

2

3

SP4446

VIN

SHDN

SW

GND

FB

5 Pin SOT-23

V

IN

SW

GND

SHDN

FB

10µH

D1

L1

R1

R2

C2

2.2 µF

High

Voltage Output

V

IN

4.7µF

C1

2 to 7V

SP4446

APPLICATIONS

■ LCD Bias

■ Tuner Pin Voltage

■ White LED Driver

■ High Voltage Bias

■ Digital Cameras

■ Cell Phone

■ Battery Backup

■ Handheld Computers

DESCRIPTION