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RT9903 Datasheet(PDF) 1 Page - Richtek Technology Corporation |
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RT9903 Datasheet(HTML) 1 Page - Richtek Technology Corporation |
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1 / 15 page  RT9903 Preliminary 1 DS9903-07 August 2007 www.richtek.com Features Two step-up DC-DC Converters (CH1, CH2) HV Internal Switches 50mA Load Current One Step-up DC-DC Converter (CH3) 0.2V Reference Voltage HV Internal Switches LED Brightness Dimming Control Over Voltage Protection One Step-up DC-DC Converter (CH4) External Switches External Current Limit Setting Step-up Charge Pump (CH5) for CCD Negative Voltage HV Internal Switches Up to 1.4MHz Switching Frequency 1 μμμμμA Supply Current in Shutdown Mode External Compensation Network for All Converters Programmable Soft Start Function (CH1, CH2, CH3, CH4) Independent Enable Pin to Shutdown Each Channel 24-Lead VQFN Package RoHS Compliant and 100% Lead (Pb)-Free Applications Digital Still Camera PDAs Portable Device 5 Channel DC/DC Converters IC with High-Efficiency Step-Up Ordering Information General Description The RT9903 is a complete power-supply solution for digital still cameras and other hand-held devices. It integrates a high-efficiency fours step-up DC-DC converters and a charge pump. The two Step-up DC-DC converters (CH1,CH2) accept inputs from 1.5V to 5.5V and regulate a resistor- adjustable output up to 17V. One Step-up DC-DC converter (CH3) can be regarded as white LED Driver, which reference voltage is 0.2V and have OVP function. One step-up DC-DC converter (CH4) regulate a resistor- adjustable output up 5V. An adjustable operating frequency (up to 1.4MHz) is utilized to get optimum size, cost, and efficiency. The feature of the charge pump (CH5) is to deliver few current to CCD negative voltage. RT9903 is available in VQFN-24L 4x4 package. Each DC-DC converters have independent shutdown inputs. Pin Configurations (TOP VIEW) VQFN-24L 4x4 Marking Information For marking information, contact our sales representative directly or through a Richtek distributor located in your area, otherwise visit our website for detail. Note : Richtek Pb-free and Green 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. 100% matte tin (Sn) plating. RT9903 Package Type QV : VQFN-24L 4x4 (V-Type) Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commer- cial Standard) CX INCD FB_CP RT EXT4 CS4 LX1 VDD PGND EN4 EN2 EN1 1 2 3 4 5 6 7 21 20 19 18 17 16 15 8 9 10 12 14 13 24 22 23 11 GND 25 |
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