RT9917
RT9917 is 7 Channel DC/DC Converters manufactured by Richtek.
7 Channel DC/DC Converters
General Description
The RT9917 is a plete 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 pensation. CH4 : Step-down DC-DC converter with internal pensation. CH5 : DC/DC converter with HV NMOS, internal pensation and load disconnect (SW5) for CCD positive supply. CH6 : DC/DC converter with HV PMOS for CCD negative supply. CH7 : WLED driver with HV NMOS, internal pensation and allow for PWM dimming. SW1 : Load disconnect controller for CH1. SW5 : Load disconnect switch for CH5. z
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 pensation 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 pact 40-Lead WQFN Package Ro HS pliant and 100% Lead (Pb)-Free z z z z z z z
Applications http://..net/ z z z
Digital Still Camera PDA Portable Device
Ordering Information
RT9917 Package Type QW : WQFN-40L 5x5 (W-Type) Lead Plating System P : Pb Free G : Green (Halogen Free and Pb Free)
Note : Richtek products are :
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Pin Configurations
(TOP VIEW)
LX1 EN134 P1 FB1 OK134 VOUT1 FB2 P2 EN2 LX2
40 39 38 37 36 35 34 33 32 31
Ro HS pliant and patible with the current requirements of IPC/JEDEC J-STD-020. Suitable for use in Sn Pb or Pb-free soldering processes.
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PVDD1 LX6 PVDD6 CP CN CPO FB6 FB4 P6 LX4
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 41
30 29 28 27 26 25 24 23 22 21
PVDD2...
