RT9986A 7-CH DC/DC Converter for DSC General Description Features zz z zz CH2 Step-Up/Step-Down Auto-Selected by External The RT9986A is a complete power supply solution for Topology digital still cameras and other handheld devices. It includes zz z zz Preset On/Off Sequence of CH1, CH2, CH3, CH4 one synchronous step-up DC/DC converter with load (1 3 4 2) disconnect, one selectable synchronous step-up/step- zz z zz Preset On/Off Sequence of CH5, CH6 (5 6) down DC/DC converter, two synchronous step-down DC/ zz z zz All Channels with Internal Compensation DC converters, one synchronous high voltage step-up DC/ zz z zz All Power Switches Integrated DC converter, one inverting DC/DC converter, and one zz z zz All Step-Up Converter with Load Disconnect selectable synchronous high voltage step-up/current- zz z zz Step-Down DC/DC Converter source for WLED. In addition, the RT9986A also includes Up to 95% Efficiency one RTC LDO, one voltage detector, and one System 100% (max) Duty Cycle Reset. All power MOSFETs are integrated in the RT9986A. zz z zz Low Voltage Step-Up DC/DC Converter The RT9986A is designed to fulfill the applications for DSC Adjustable Output Voltage as follows : Up to 95% Efficiency CH1 is a synchronous step-up output for motor or DSC zz z zz WLED Driver system I/O power Auto-Selected by External Topology Current Source Mode with 30mA DC Current CH2 is a selectable synchronous step-up/step-down Step-Up Mode with LED Open Protection (OVP7) output for motor or DSC system I/O power Direct PWM Dimming Control CH3 and CH4 are synchronous step-down outputs for DSP zz z zz Fixed 2MHz Switching Frequency for CH1/2/3/4, core and memory power supply Fixed 1MHz Switching Frequency for CH5/6/7 CH5 is a synchronous high voltage step-up output for CCD zz z zz Small 32-Lead WQFN Package bias power supply zz z zz RoHS Compliant and Halogen Free CH6 is an inverting output for negative CCD bias power supply Applications z Digital Still Camera CH7 is a selectable synchronous high voltage step-up/ z PDA current source for driving WLED z Portable Devices The selectable step-up/step-down converter can be auto selected by external component topology. For the Marking Information RT9986A, all 7-CHs have built in internal compensation. EZ= : Product Code The RT9986A also provides a transformerless inverting YMDNN : Date Code EZ=YM converter for supplying CCD power. For the low voltage DNN synchronous step-up and step down converters, efficiency can be up to 95%. The RT9986A provides comprehensive protection features including over current protection, thermal shutdown protection, over voltage protection, overload protection, and under voltage protection. DS9986A-00 May 2011 www.richtek.com 1RT9986A Ordering Information Pin Configurations RT9986A (TOP VIEW) Package Type QW : WQFN-32L 4x4 (W-Type) Lead Plating System 32 31 30 29 28 27 26 25 G : Green (Halogen Free and Pb FB1 1 24 FB2 2 23 VREF SYSR Free) 3 22 FB6 RTCPWR VOUT6 4 21 VDDM Note : GND 5 20 FB7 LX5 6 19 PVDD7 PVDD5 Richtek products are : 33 LX7 7 18 FB5 8 EN7 17 RoHS compliant and compatible with the current require- RST 9 10 11 12 13 14 15 16 ments of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. WQFN-32L 4x4 www.richtek.com DS9986A-00 May 2011 2 LX4 EN56 PVDD4 LX1 FB4 PVDD1 VCHK BAT VNEG LX6 FB3 PVDD2 PVDD3 LX2 LX3 EN1234