SP6682 Datasheet | Exar

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 600k Hz 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 puters - Color LCD Modules FEATURES - 200m A 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 - 1m A 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 .exar. Tel. +1 510 668-7000 - Fax. +1 510 668-7001 High Efficiency White LED Charge Pump Regulator ABSOLUTE MAXIMUM RATINGS These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. VIN, VMODE, VOUT,...