Part # LM2754 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM2754 800mA Switched Capacitor Flash LED Driver with Time-Out Protection

Part Details:

LM2754 September 2006 800mA LM2754800mA Switched Capacitor Flash LED Driver withTime-Out Protection Switched General Description Features The LM2754 is an integrated low noise, high current n Up to 800mA Output Current switched capacitor DC/DC converter with four regulated cur- n Wide Operating Input Voltage Range: 2.8V to 5.5V rent sinks. The device is optimized for driving 1 to 4 high n Drives 1, 2, 3 or 4 LEDs in Parallel power white LEDs in parallel with a maximum current of n Ability to Disable One Current Sink Via the SEL Pin to Capacitor 800mA. Maximum efficiency is achieved over the input volt- Accommodate 3-LED Flash Modules age range by actively selecting the proper gain based on the n Time-Out Circuitry Limits Flash Duration to 1 Second LED forward voltage and current requirements. n TX Input Ensures Synchronization with RF Power Two external low power resistors set the desired current for Amplifier Pulse Torch and Flash modes. The TX pin allows the device to be n Adaptive 1x, 1.5x and 2x Gains for Maximum Efficiency forced into Torch mode during a Flash pulse, allowing for n 1MHz Constant Frequency Operation synchronization between the RF power amplifier pulse and Flash Flash/Torch modes. To protect the device and Flash LEDs, n Output Current Limit internal Time-Out circuitry turns off the LM2754 in case of a n True Shutdown Output Disconnect faulty prolonged Flash mode. Internal soft-start circuitry lim- n <1µA Shutdown Current its the amount of inrush current during start-up. n Internal Soft-Start Limits Inrush Current LED The LM2754 is available in a small 24-pin thermally en- n No Inductor Required hanced LLP package. n Total Solution Size without LED <28mm2 n Low Profile 24-Pin LLP Package (4mm x 4mm x 0.8mm) Driver Applicationsn Camera Flash in Mobile Phones n Flash for Digital Cameras with n Supplies for DSP s, Microprocessors, Memory, MP3 Players, Pagers, Other Portable Devices T Typical Application Circuit ime-Out Protection 20202801

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LM2754.pdf Datasheet