SP6682 Datasheet, PDF (1/13 Pages) Sipex Corporation – High Efficiency Charge Pump Regulator for White LEDs

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 V_OUT 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. [phone] – Fax. [phone]