Mar16-06 Rev B

SP7648 Ultra-low Quiescent Current, High Efficiency Boost Regulator

© 2006 Sipex Corporation

Solved by

TM

SP7648

FeaTUReS

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True Shutdown

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700mA Output Current at 3.3V Input; 4.2V

output

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Wide Input Voltage Range: 2.7V to 4.5V

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5V Fixed or Adjustable Output

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0.3 Switch

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Integrated Synchronous Rectifier:0.3

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Anti-Ringing Switch Technology

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Programmable Inductor Peak Current

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Logic Shutdown Control

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Low 0.8V or 0.288V Reference Voltage

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Small 10 pin DFN or MSOP Package

Low Reference High efficiency Boost Regulator

aPPLicaTiOnS

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LED Driver

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Camera Flash

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Handheld Portable Devices

DeScRiPTiOn

The SP7648 is an ultra-low quiescent current, high efficiency step-up DC-DC converter ideal for

single cell Li-Ion or dual cell alkaline battery applications to drive various LEDs. The SP7648

combines low quiescent current and excellent light-load efficiency of PFM control. The SP7648

featuressynchronousrectification,a0.3 chargingswitch,ananti-ringinginductorswitch, under-

voltage lockout and programmable inductor peak current. The device can be shut down by a

1nA active LOW shutdown pin. A very low 0.288V reference voltage is optimized for driving a

constant current load.

TYPicaL aPPLicaTiOn ciRcUiT

Now Available in Lead Free Packaging

SP7648

10 Pin DFN

0

9

8

7

6



2

3

4

5

VOUT

LX

PGND

GND

FB

FLASH

SHDN

NC (Test)

RLIM

VBATT

®

4.7µH

SP7648

FLASH

FB

LX

NC

1.0K

On/OFF

0µF

SHDN

GND

0µF

0.33

(2.7 - 4.5V)

FLaSH

470pF

1K