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

Keyword 2

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