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RT9971 Datasheet(PDF) 1 Page - Richtek Technology Corporation |
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RT9971 Datasheet(HTML) 1 Page - Richtek Technology Corporation |
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1 / 22 page  1 DS9971-01 April 2011 www.richtek.com RT9971 7 CH Power Management IC Ordering Information Note : Richtek products are : } RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020. } Suitable for use in SnPb or Pb-free soldering processes. Features l One Synchronous Step-Up or Step-Down Selectable Convertor l Support 2AA or Li-ion Battery Applications l Preset On/Off Sequence l 5 CHs with Internal Compensation l All Power Switches Integrated l Up to 95% Efficiency l 100% (max) Duty Cycle for Step-Down Converter l Adjustable Output Voltage l LED PWM Dimming Control l LED Open Protection l Transformerless Inverting Converter for CCD l Fixed 1MHz Switching Frequency at CH1 to CH7 l RTC_LDO/SW1 Selectable by CN Pin l 40-Lead WQFN Package l RoHS Compliant and Halogen Free General Description The RT9971 is a complete power supply solution for digital still cameras and other hand held devices. The RT9971 is a multi-channel power management IC including two step- up DC/DC converters, two step-down DC/DC converters, one selectable step-up/step-down DC/DC converter, one inverting DC/DC converter and one WLED driver. The RT9971 is designed to fulfill the applications for DSC just as follows : CH1 is a synchronous step-up output for motor or DSC system I/O power CH2 is a selectable synchronous step-up/step-down output for motor or DSC system I/O power CH3 and CH4 are synchronous step-down outputs for DSP core and memory power supply CH5 is a high voltage step-up output for CCD bias power supply CH6 is an inverting output for negative CCD bias power supply CH7 is a high voltage step-up output for driving WLED For the CH2, the step-up or step-down converter, operation mode can be selected by the SEL pin. Among all CHs, there are 5 CHs with the built-in internal compensation. The RT9971 also provides a transformerless inverting conv erter for supplying the CCD power. For the synchronous step-up and step down converters, the efficiency can be up to 95%. The IC provides load disconnection for CH 1 and CH 5. The IC has selectable RTC_LDO/SW1 that can be determined by the CN pin. The RT9971 is able to support Li-ion and 2AA battery applications. The RT9971 provides WLED open protection, current limit, thermal shutdown protection, over voltage and under voltage protection to achiev e complete protection. The RT9971 is available in WQFN-40L 5x5 package. Applications l Digital Still Camera l PDA l Portable Device RT9971 Package Type QW : WQFN-40L 5x5 (W-Type) Lead Plating System G : Green (Halogen Free and Pb Free) |
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