RT9917 - Richtek Technology Corporation

RT9917 7 Channel DC/DC Converters

The RT9917 is a complete power-supply solution for digital still cameras and other hand-held devices. It integrates : CH1 : Boost DC-DC converter with load disconnect controller (SW1). CH2 : Selectable Boost/Buck DC-DC converter CH3 : Step-down DC-DC converter with internal compensation. CH4 : Step-down DC-DC converter with internal compensation. CH5 : DC/DC.

Features

z z z z 1 Channel Boost/Buck Selectable by SEL Pin 2 Selectable On/Off Sequence Set by SEQ Pin 4 Channels with Internal Compensation Provide Charge Pump Voltage to Enhance NMOS Gate Driving Capability for Alkaline Battery Input All Power Switches Integrated Syn Step-Down DC/DC Converter ` Up to 95% Efficiency ` 100% (MAX) Duty Cycle Syn Step-Up DC/DC Converter ` Adjustable Output Voltage ` Up to 95% Efficiency Open LED Protection Transformerless Inverting Converter for CCD Fixed 1MHz Switching Frequency Compact 40-Lead WQFN Package RoHS Compliant and 100% Lead (Pb)-Free z z z z z z z Appli.