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The RT9907 is a three channel power-supply solution for digital still cameras and other battery-powered devices. It integrates an asynchronous step-up and two synchronous step-down DC-DC converters. The RT9907 is targeted for applications that use two AA cells or a single lithium-ion battery. <br /><br />The three DC-DC converters (CH1, CH2, CH3) accept input voltage from 1.5V to 5.5V. Each DC-DC converter has better transient response and excellent stability by providing current-mode control and external compensation network. With built-in Internal MOSFET and up to 1.4MHz operating frequency, the RT9907 allows minimum BOM cost and PCB area.<br /><br />The step-down DC-DC converters (CH2, CH3) can regulate output voltage as low as 0.8V. Three operational modes are available: PWM, PSM, Low-Dropout modes. At PWM mode, Internal synchronous rectifier with low R<sub>DS(ON)</sub> dramatically reduces conduction loss and achieve 94% efficiency. It enters Low-Dropout mode when normal PWM cannot provide regulated output voltage by continuously turning on the upper P-MOSFET. No external Schottky diode is required in practical application.<br /><br />Each DC-DC converter has independent enable input and soft-start function allowing versatile power sequence combination. Complete protection functions are implemented such as short circuit, over-voltage protection.<br /><br />The RT9907 is available in small VQFN-24L 4x4 package.
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<li class="mv5"> 1.5V to 5.5V Battery Input Voltage Range<br /> </li><li class="mv5"> Main step-up DC-DC Converter<br /> ► 1.5V to 5.5V Adjustable Output Voltage<br /> ► Up to 90% Efficiency<br /> ► 2.6A, 0.3Ω Internal Power Switch<br /> </li><li class="mv5"> Two Step-Down DC-DC Converters<br /> ► 0.8V to 5.5V Adjustable Output Voltage <br /> ► 94% Efficiency<br /> ► 100% Duty Cycle<br /> </li><li class="mv5"> Up to 1.4MHz Switching Frequency<br /> </li><li class="mv5"> 1μA Supply Current in Shutdown Mode<br /> </li><li class="mv5"> Programmable Soft Start Function<br /> </li><li class="mv5"> Independent Enable Pin (CH1, CH2, CH3)<br /> </li><li class="mv5"> External Compensation Network (CH1, CH2, CH3)<br /> </li><li class="mv5"> Short Circuit Protection (CH1, CH2, CH3)<br /> </li><li class="mv5"> Over Voltage Protection (CH2) <br /> </li><li class="mv5"> 24-Lead VQFN Package<br /> </li><li class="mv5"> RoHS Compliant and 100% Lead (Pb)-Free</li>
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<li class="mv5"> Digital Still Camera <br /> </li><li class="mv5"> PDAs<br /> </li><li class="mv5"> Portable Device</li>
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