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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.
RT9907 Typical Circuit
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<div class="spec-list"><ul class="lv1"><li>1.5V to 5.5V Battery Input Voltage Range </li><li>Main step-up DC-DC Converter <ul class="lv2"> <li></li><li>1.5V to 5.5V Adjustable Output Voltage </li><li>Up to 90% Efficiency </li><li>2.6A, 0.3Ω Internal Power Switch </li></ul> </li><li>Two Step-Down DC-DC Converters <ul class="lv2"> <li></li><li>0.8V to 5.5V Adjustable Output Voltage </li><li>94% Efficiency </li><li>100% Duty Cycle </li></ul> </li><li>Up to 1.4MHz Switching Frequency </li><li>1μA Supply Current in Shutdown Mode </li><li>Programmable Soft Start Function </li><li>Independent Enable Pin (CH1, CH2, CH3) </li><li>External Compensation Network (CH1, CH2, CH3) </li><li>Short Circuit Protection (CH1, CH2, CH3) </li><li>Over Voltage Protection (CH2) </li><li>24-Lead VQFN Package </li><li>RoHS Compliant and 100% Lead (Pb)-Free </li></ul></div>
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RT9907 Ordering Information
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<div class="spec-list"><ul class="lv1"><li>Digital Still Camera </li><li>PDAs </li><li>Portable Device </li></ul></div>
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