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The RT8547 is a high efficiency, high current, Boost-type flash LED driver capable of 1.6A maximum output current. It is an ideal power solution for LED photo flash applications in all single cell Lithium-ion/polymer battery operated products. <p align="justify">The RT8547 maintains output current regulation by switching the internal high side and low power switches switch transistors. The power switches are pulse width modulated at a fixed frequency of 2MHz. The high switching frequency allows the use of small inductor and output capacitor that makes the RT8547 being ideally suited for small battery powered applications. </p><p align="justify">One-wire dimming control function is designed to set the strobe mode current level through the FLSET pin for the flash LEDs. </p><p align="justify">The RT8547 contains over voltage protection, over current protection and over temperature protection functions to protect the device from output open circuit and short-circuit conditions. An internal soft- start control circuit is built-in to prevent excessive inrush current during start-up. In shutdown mode, the supply current is reduced to 2&mu;A.</p>
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  • Input Voltage Range : 2.8V to 5.5V
  • Current Accuracy within 5%
  • Up to 1.6A Regulated Output Current
  • Up to 88% Efficiency with Small Magnetics
  • 2MHz Switching Frequency
  • Separate Strobe and Torch Mode Current
  • Programmable Safety Timer
  • Input Current Limit
  • Over Voltage Protection for LED Open
  • Over Temperature Protection
  • True Load Disconnect
  • Shutdown Current : <2μA
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Cellular Phones<br />Digital Cameras<br />PDAs and Smart Phones<br />Probable Instruments<br />Point of Load Regulation for High-Performance DSPs, FPGAs, and ASICs
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