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Date: 7/20/05

SP7648 Ultra-low Quiescent Current, High Efficiency Boost Regulator

© Copyright 2005 Sipex Corporation

SP7648

FEATURES

■ True Shutdown

■ 700mA Output Current at 3.3V Input; 4.2V

output

■ Wide Input Voltage Range: 2.7V to 4.5V

■ 5V Fixed or Adjustable Output

■ 0.3Ω Switch

■ Integrated Synchronous Rectifier:0.3Ω

■ Anti-Ringing Switch Technology

■ Programmable Inductor Peak Current

■ Logic Shutdown Control

■ Low 0.8V or 0.288V Reference Voltage

■ Small 10 pin DFN or MSOP Package

Low Reference High Efficiency Boost Regulator

APPLICATIONS

■ LED Driver

■ Camera Flash

■ 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

features synchronous rectification, a 0.3Ω charging switch, an anti-ringing inductor switch, 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

10

9

8

7

6

1

2

3

4

5

V

OUT

LX

P

GND

GND

FB

FLASH

SHDN

NC (Test)

R

LIM

V

BATT

Preliminary

®

4.7µH

SP7648

FLASH

FB

LX

NC

1.0KΩ

ON/OFF

10µF

SHDN

GND

10µF

0.33Ω

(2.7 - 4.5V)

FLASH

470pF

1KΩ