DESCRIPTION

The SP6683 is a high power current regulated charge pump ideal for converting a Li-Ion battery input for driving up to 8 white LED’s used in backlighting color displays. The SP6683 operates with an internal 1.2MHz clock, enabling the use of small external components. Output current can be accurately regulated by modulating the switcher between the charge pump and output capacitor. In shutdown mode, the SP6683 discharges the output to ground and draws less than 500nA current. Offered in 10-pin DFN package, the SP6683 family includes three options that allow the user to optimize LED driving circuit; SP6683-LV with low voltage reference, SP6683-03 with high impedance output in shutdown, and SP6683 with pulled down output in shutdown.

FEATURES

■ Output Current up to 200mA

■ Ideal for White LED driver in CellPhone Flash

■ 0.5μA Shutdown Current

■ 1x/1.5x Mode Charge Pump

■ +2.7V to +5.5V Input Voltage Range

■ Built-in 1.2MHz Oscillator

■ 0.5mA Quiescent Current

■ Over Temperature Protection

■ Shorted LED Protection

■ Programmable Output Current or Voltage

■ PWM Dimming Control via Enable Pin

■ Soft Start to limit In-Rush Current

■ Space Saving 10-pin 3 x 3mm DFN Package

■ Three Options for Optimizing Efficiency:

■ SP6683 - MOSFET discharge in shutdown

■ SP6683-03 - High Impedance in shutdown

■ SP6683-LV - Low Voltage (150mV)VFB Reference

APPLICATIONS

■ Mobile Phone

■ Camera Flash Driver

■ PDA

■ Digital Still Camera

■ Digital Camcorder

■ Color LCD Module