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Product Spec Banner
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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. 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. One-wire dimming control function is designed to set the strobe mode current level through the FLSET pin for the flash LEDs. 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 2μA.
RT8547 Typical Circuit
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<div class="spec-list"><ul class="lv1"><li>Input Voltage Range : 2.8V to 5.5V </li><li>Current Accuracy within 5% </li><li>Up to 1.6A Regulated Output Current </li><li>Up to 88% Efficiency with Small Magnetics </li><li>2MHz Switching Frequency </li><li>Separate Strobe and Torch Mode Current </li><li>Programmable Safety Timer </li><li>Input Current Limit </li><li>Over Voltage Protection for LED Open </li><li>Over Temperature Protection </li><li>True Load Disconnect </li><li>Shutdown Current : <2μA </li></ul></div>
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RT8547 Ordering Information
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<div class="spec-list"><ul class="lv1"><li>Cellular Phones </li><li>Digital Cameras </li><li>PDAs and Smart Phones </li><li>Probable Instruments </li><li>Point of Load Regulation for High-Performance DSPs, FPGAs, and ASICs </li></ul></div>
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