SP7685 1.2A Buck/Boost Charge Pump LED Driver FEATURES V 1 10 V Output Current up to 1.2A IN OUT Up to 94% Efficiency in Torch Mode C1 2 9 P SP7685 GND Adjustable FLASH Mode Current C2 3 8 S GND 10 Pin DFN Minimum External Components: No Inductors FLASH 4 7 FB Automatic Buck/Boost Mode Switchover 6 EN 5 Wide V Range: 2.7V to 5.5V R IN SET High Frequency Operation: 2.4 MHz 50mV Reference for low Loss Sensing I < 2 A in Shutdown Q APPLICATIONS PWM Dimming Control White LED Torch/Flash for Cell Automatic Soft Start Limits Inrush Current Phones, DSCs, and Camcorders Overvoltage Protection on Output White LED Backlighting Overcurrent/temperature Protection Generic Lighting/Flash/Strobe Low Ripple and EMI Applications Ultra-low Dropout Voltage in Buck Mode General Purpose High Current Boost 2.6 Second Timeout in Flash Mode Space Saving RoHS Compliant, Lead Free Package: 10-pin 3mm x 3mm DFN DESCRIPTION The SP7685 is a current-regulated charge pump ideal for powering high brightness LEDs for camera flash applications. The charge pump can be set to regulate two current levels for FLASH and TORCH modes. The SP7685 automatically switches modes between step-up and step-down ensuring that LED current does not depend on the forward voltage. A low current sense reference voltage (50mV) allows the use of small 0603 current sensing resistors. The SP7685 is offered in 10-pin DFN package. TYPICAL APPLICATION CIRCUIT V IN (3.0 - 4.2V) O V V IN OUT C IN C OUT 1A Flash 10F C1 P C SP7685 GND 10F FC 200mA Torch 1F C2 S PWF1 WLED GND FLASH TORCH/FLASH FB EN ENABLE R SET R SET R SENSE 80K 0.22 Date: 6/20/06 Rev T SP7685, 1.2A Buck/BoostCharge Pump LED Driver 2006 Sipex Corporation 1ABSOLUTE MAXIMUM RATINGS V , V ....................................................................... -0.3V to 6V IN OUT Output Current Pulse (Flash) ................................. 2A These are stress ratings only and functional operation of Output Current Continuous (Torch) ..................... 0.4A the device at these ratings or any other above those Storage Temperature ...................... -65C to +150C indicated in the operation sections of the specifications Operating Temperature ..................... -40C to +85C below is not implied. Exposure to absolute maximum V ............................................................ 0.0V to 7V rating conditions for extended periods of time may affect EN 3x3 10 DFN .........................................O = 40.5C/W reliability. JA ESD Rating............................................... 2kV HBM ELECTRICAL CHARACTERISTICS T = -40C to +85C, V =3.6V, C = 10 F, C =1.0 F, C =10 F. V = V typical values at 25C. The A IN IN FC OUT SHDN IN, denotes the specifications which apply over the full operating temperature range unless otherwise noted. PARAMETER MIN. TYP. MAX. UNITS CONDITIONS Operating Input Voltage 2.7 5.5 V Quiescent Current 0.5 3 mA V = 2.7 - 5.5V FLASH = GND, IN 1X Mode, I LOAD = 100A 2 FLASH = High, 2x mode Shutdown Current 2 A V = 5.5V, VEN = 0.0V IN Oscillator Frequency 2.4 MHz Charge Pump Equivalent 4 V = 0.0V, V = 3.6V FB IN Resistance (x2 mode) Charge Pump Equivalent 0.4 0.7 V = 3.6V IN Resistance (x1 mode) 45 50 55 mV FLASH = GND FB Reference Voltage 138 150 162 mV FLASH = High, R = 53.6k. SET FB Reference Voltage Range 100 400 mV FLASH = High. Guaranteed by design. FB Pin Current 0.5 A V = 0.3V FB EN, FLASH Logic Low 0.4 V EN, FLASH Logic High 1.3 V EN, FLASH Pin Current 0.5 A V Turn-on Time 170 500 s V = 3.6V, FB within 90% of OUT IN regulation o Thermal Shutdown 145 C Temperature Maximum Flash ON time 1.6 2.6 3.6 s FLASH = High Date: 6/20/06 Rev T SP7685, 1.2A Buck/BoostCharge Pump LED Driver 2006 Sipex Corporation 2