RT9911

RT9911 6 Channel DC/DC Converters with a Linear Controller General Description The RT9911 is a complete power-supply solution for digital still cameras and other hand-held devices. It integrates one selectable Boost/Buck DC-DC converter, one highefficiency step-down DC-DC converter, one high-efficiency main step-up converter, one PWM converter for CCD positive voltage, one inverter for CCD negative voltage and www.DataSheet4U.com one white LED driver for LCD backlight and a linear controller that drives an external P-Channel MOSFET for a linear regulator. The RT9911 is targeted for applications that use either two or three primary cells or a single lithium-ion battery. RT9911 is available in VQFN-40L 6x6. Each DC-DC converter has independent shutdown input. z Features z z 1.6V to 5.5V Battery Input Voltage Range Synchronous Boost/Buck Selectable DC-DC Converter `Internal Switches `Up to 95% efficiency Syn-Buck DC-DC Converters `0.8V to 5.5V Adjustable Output Voltage `Up to 95% efficiency `100%(MAX) Duty Cycle `Internal Switches Main Boost DC-DC Converter `Adjustable Output Voltage `Up to 97% efficiency PWM Converter for CCD positive voltage Inverter for CCD negative voltage White LED Driver for LCD panel backlight Up to 1.4MHz Adjustable Switching Frequency 1μA Supply Current in Shutdown mode External compensation network for all converters Independent enable pin to shutdown each channel. 40-Lead VQFN Package RoHS Compliant and 100% Lead (Pb)-Free z z Ordering Informatio...