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The RT9387A is a high current charge pump designed specifically for use with white LEDs in camera flash applications. The charge pump can support one flash LED with up to 700mA of regulated constant current for uniform intensity. </p>Highest efficiency is maintained by utilizing a x1/x1.5/x2 fractional charge pump and low dropout current regulators. </p>The RT9387A also offers a built-in flash timeout function as a safety feature associated with the high power flash driver. The safety timer is adjustable via an external capacitor. </p>The RT9387A provides protection features such as Over-Temperature Protection (OTP) and Over-Voltage Protection (OVP). A soft-start circuitry is also included to prevent excessive inrush current at start-up and mode transitions. </p>The RT9387A is available in the WQFN -16L 2x3 package.</p>
RT9387A Typical Circuit
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<div class="spec-list"><ul class="lv1"><li>Pulse Dimming Control </li><li>One 700mA Flash LED Channel </li><li>User Programmable Flash and Torch Current </li><li>Tx Mask Function </li><li>User Adjustable Safety Timer for Flash LED Protection </li><li>Automatic x1/x1.5/x2 Charge Pump Mode Transition </li><li>Low Input Noise and EMI Charge Pump </li><li>5.6V Over-Voltage Protection </li><li>Power On/Mode Transition In-rush Protection </li><li>Thermal Regulation </li><li>Over-Temperature Protection </li><li>Typical 0.3μA Low Shutdown Current </li><li>Small 16-Lead WQFN Package </li><li>RoHS Compliant and Halogen Free </li></ul></div>
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RT9387A Ordering Information
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<div class="spec-list"><ul class="lv1"><li>Camera Phone, Digital Still Cameras </li></ul></div>
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