SP7683

www.DataSheet4U.com ® Advanced SP7683 Four Channel Charge Pump Regulator LED Driver FEATURES ■ 2.7V to 5.5V Input Voltage Range ■ Up to 4 LEDS with matching currents ■ LEDs can be Driven from the Charge Pump Output ■ 1X and 1.5X Mode Charge Pump ■ High Efficiency Operation ■ 1.2 MHz Switching Frequency ■ Programable LED Drive Capabliity ■ PWM Dimming Control ■ Low 0.5µA Shutdown Current ■ Soft-Start Limits Inrush Current ■ Output Overvoltage Protection ■ Thermal Shutdown Protection ■ QFN (4mm x 4mm) package LED2 EN/ PWM 14 LED1 16 15 13 12 FB ISET On/Off LED3 LED4 1 2 3 4 SP7683 4x4 mm 16 Pin QFN C2N 11 VMODE 10 VIN 9 C1P 8 5 6 7 C1N Now Available in Lead Free Packaging APPLICATIONS ■ Smart Phones ■ Cell Phones ■ PDA's ■ Digital Cameras ■ MP3 Players ■ Other Portables DESCRIPTION The SP7683 is high efficiency Charge Pump which regulates up to four white LEDs with matching current. Based on the supply headroom available for the four precision current sinks, SP7683 automatically switches between 1X and 1.5X modes. The part powers up in 1X mode, with low quiescent current of 70uA (typ) and remains in 1X mode as long as the LED current has not decreased by more than 0.5%. If the current decreases, then it switches into 1.5X mode where it regulates the lowest of the LED cathode voltages to 0.1V. Other features include soft-start, over current protection, overvoltage protection and thermal shutdown at 140°C. Offered in 4X4 16 pin QFN. TYPICAL APPLICATION SCHEMATIC...