SP6682EU-L/TR View Datasheet(PDF) - Exar Corporation

Part Name

Description

Manufacturer

SP6682EU-L/TR

High Efficiency White LED Charge Pump Regulator

Exar Corporation 

February 2009

SP6682

High Efficiency White LED Charge Pump Regulator

Rev. 2.0.0

GENERAL DESCRIPTION

The SP6682 is a current regulated charge

pump ideal for converting a Li-Ion battery

input for driving white LEDs used in

backlighting color displays or cell phone

camera flash applications.

The charge pump automatically switches

between x1.5 and x2 modes based on the

program-mable VMODE voltage, providing

improved efficiency over traditional methods

using charge pump doubler followed by LDO.

This input voltage threshold can be externally

programmed by a resistor divider network for

optimized efficiency at specific output voltages

and currents.

The SP6682 operates with an internal 600kHz

clock, which reduces switching noise and

improves VOUT ripple. Output current or

voltage can be accurately regulated by

modulating the switcher between the charge

pump and output capacitor. In shutdown

mode, the IC disconnects the output from the

input and draws less than 1.5μA current.

The SP6682 is offered in a 10-pin MSOP

package, and a small 10-Pin DFN Package.

APPLICATIONS

• Mobile Phones & PDAs

• 3.3V to 5V Conversion

• Palmtop Computers

• Color LCD Modules

FEATURES

• 200mA Output Current

• Low Profile Inductorless Regulator

− 600KHz Oscillator

− x1.5 and x2 Conversion Modes

• 2.7V to 5.5V Input Voltage Range

• Fast Turn-on Time 175µs

• 1mA Quiescent Current

• Adjustable Output Current and Voltage

• PWM Dimming Control

• True Shutdown Disconnect

• Soft Start

• 10-pin MSOP and 10-pin DFN Packages

TYPICAL APPLICATION DIAGRAM

Fig. 1: SP6682 LCD Backlighting Application Diagram

Exar Corporation

48720 Kato Road, Fremont CA 94538, USA

www.exar.com

Tel. +1 510 668-7000 – Fax. +1 510 668-7001

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