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Digital Cameras
Digital Cameras
Portable Instruments
CH1 Sync Step-Up in PWM mode or Async Step-Up in Pulse Frequency Mode
CH1 Sync Step-Up in PWM mode or Async Step-Up in Pulse Frequency Mode
CH2 LV Sync Step-Up/Down
CH3/4 LV Sync Step-Down with 100% Maximum Duty Cycle
CH5 HV Sync Step-Up for CCD+ Power with Load Disconnect Function
CH6 HV Async Inverter for CCD- Power
CH7 WLED Driver in Sync Step-Up Mode or Constant Current Source Mode
Open LED Protection
32 Dimming Levels
CH8 Generic Low Voltage LDO for Multiple Purpose Power Supply
CH9 Keep Alive Low Quiescent LDO
I2C Interface to Program :
Enable
Power On Delay Time
Output Regulated Voltage
WLED Dimming Current
RTC Timer and Oscillator
CH3/4 Fixed 2MHz Frequency
CH1/2/5/6/7 Fixed 1MHz Frequency
CH1/3/4/7/8 Support Dynamic Voltage Scaling (DVS)
High Efficiency Up to 95%
RoHS Compliant and Halogen Free
7+2 Channel DC/DC Converters with RTC and I2C Interface
The RT9999A/B is a highly integrated power management IC that contains 7-CH ,switching DC/DC converters, one generic LDO, one Keep Alive low quiescent LDO, ,a switch with reverse leakage prevention from backup battery, and a Real-Time ,Clock (RTC) that includes a time counter and a 32768Hz oscillator for DSC ,applications.The DC/DC converters include one low voltage step-up operated in ,either asynchronous PFM or synchronous PWM, one current mode synchronous ,step-up/down (buck boost), two synchronous step-downs, one high voltage ,synchronous step-up for CCD+ with load disconnect, one asynchronous inverter ,for CCD-, and one WLED driver operated in either synchronous step-up mode or ,constant current source mode. All power MOSFETs are integrated and compensation ,networks are built in.,,The RT9999A/B uses I2C interface to set power on timing, output voltage, and ,WLED current and dimming level. The I2C is also used to access RTC time ,counters and oscillator fine tuning.,,The RT9999A/B provides comprehensive protection functions, including over ,current, under voltage, over voltage, over temperature, and over load.,,The RT9999A/B is available in a WQFN-40L 5x5 package.,,
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