SSPP66668855 770000mmAA BBuucckk//BBoooosstt CChhaarrggee PPuummpp LLEEDD DDrriivveerr June 2009 Rev. 2.0.0 GENERAL DESCRIPTION APPLICATIONS The SP6685 is a current-regulated charge White LED Torch/Flash for Cell Phone, pump ideal for powering high brightness LEDs DSCs and Camcorders for camera flash applications. White LED Backlighting The charge pump can be set to regulated two Generic Lighting/Flash Application current levels for FLASH and TORCH modes. General Purpose High Current Boost The SP6685 automatically switches modes between step-up and step-down ensuring that LED current does not depend on the forward FEATURES voltage. A low current sense reference voltage (50mV) allows the use of small 0603 current Output Current up to 700mA sensing resistors. Up to 94% Efficiency in Torch Mode The SP6685 is designed to operate from a Minimum External Components: single cell lithium-ion battery or fixed 3.3V or No Inductor 5.0V power rails and is available in a RoHS compliant, green/halogen free space saving Adjustable FLASH Mode Current 10-pin 3mmx3mm DFN package. 1x and 2x Charge Pump Operation 2.4MHz High Frequency Operation I < 1A in Shutdown Q Built-In Soft Start Limit Inrush Current Output Overvoltage Protection Over current/Temperature Protection 10pin 3x3mm DFN Package TYPICAL APPLICATION DIAGRAM Fig. 1: SP6685 Application Diagram Exar Corporation www.exar.com 48720 Kato Road, Fremont CA 94538, USA Tel. +1 510 668-7000 Fax. +1 510 668-7001 SSPP66668855 770000mmAA BBuucckk//BBoooosstt CChhaarrggee PPuummpp LLEEDD DDrriivveerr ABSOLUTE MAXIMUM RATINGS OPERATING RATINGS These are stress ratings only and functional operation of Input Voltage Range V ............................... 2.7V to 5.5V IN the device at these ratings or any other above those Operating Temperature Range ................... -40C to 85C indicated in the operation sections of the specifications Thermal Resistance ................................... 57.1C/W JA below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. V , V ................................................... -0.3V to 6.0V IN OUT Output Current Pulse (FLASH) .................................... 1A Output Current Continuous (TORCH) ........................ 0.4A V ................................................................. 0V to 7V EN Storage Temperature .............................. -65C to 150C Lead Temperature (Soldering, 10 sec) ................... 260C ESD Rating EN pin (HBM - Human Body Model) .......... 1kV ESD Rating All Other Pins (HBM) .............................. 2kV ELECTRICAL SPECIFICATIONS Specifications with standard type are for an Operating Junction Temperature of T = 25C only limits applying over the full J Operating Junction Temperature range are denoted by a . Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely parametric norm at T = 25C, and are provided for J reference purposes only. Unless otherwise indicated, V = 3.6, C = 4.7F, C = C = 1F. T = 40C to 85C. IN IN FC OUT A Parameter Min. Typ. Max. Units Conditions Operating Input Voltage 2.7 5.5 V V = 2.7 5.5V FLASH = 0V IN 0.5 3 I = 100 A Quiescent Current mA LOAD 2 FLASH = V , 2x Mode IN Shutdown Current 1 A V = 5.5V, V = 0V IN EN Oscillator Frequency 2.4 MHz Charge Pump Equivalent 5 V = 0V, V = 3.6V FB IN Resistance (x2 Mode) Charge Pump Equivalent 0.6 0.8 V = 3.6V IN Resistance (x1 Mode) FB Reference Voltage 138 150 162 mV FLASH = V R = 88.7K IN, SET FB Reference Voltage 45 50 55 mV FLASH = GND 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 250 500 S V = 3.6V, FB within 90% of regulation OUT IN o Thermal Shutdown Temperature 145 C 2009 Exar Corporation 2/14 Rev. 2.0.0