LM2754

LM2754 www.ti.com SNVS463A – SEPTEMBER 2006 – REVISED MAY 2013 LM2754 800mA Switched Capacitor Flash LED Driver with Time-Out Protection Check for Samples: LM2754 FEATURES 1 2 Up to 800mA Output Current Wide Operating Input Voltage Range: 2.8V to 5.5V Drives 1, 2, 3 or 4 LEDs in Parallel Ability to Disable One Current Sink Via the SEL Pin to Accommodate 3-LED Flash Modules Time-Out Circuitry Limits Flash Duration to 1 Second TX Input Ensures Synchronization with RF Power Amplifier Pulse Adaptive 1x, 1.5x and 2x Gains for Maximum Efficiency 1MHz Constant Frequency Operation Output Current Limit True Shutdown Output Disconnect <1µA Shutdown Current Internal Soft-Start Limits Inrush Current No Inductor Required Total Solution Size without LED <28mm2 Low Profile 24-Pin WQFN Package (4mm x 4mm x 0.8mm) APPLICATIONS Camera Flash in Mobile Phones Flash for Digital Cameras Supplies for DSP’s, Microprocessors, Memory, MP3 Players, Pagers, Other Portable Devices DESCRIPTION The LM2754 is an integrated low noise, high current switched capacitor DC/DC converter with four regulated current sinks. The device is optimized for driving 1 to 4 high power white LEDs in parallel with a maximum current of 800mA. Maximum efficiency is achieved over the input voltage range by actively selecting the proper gain based on the LED forward voltage and current requirements. Two external low power resistors set the desired current for Torch and Flash modes. The TX p...