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RT9902

Richtek Technology Corporation
Part Number RT9902
Manufacturer Richtek Technology Corporation
Description 4 Channel DC/DC Converters IC
Published Jul 30, 2008
Detailed Description Preliminary RT9902 4 Channel DC/DC Converters IC with High-Efficiency Step-Up and Step-Down General Description The RT...
Datasheet PDF File RT9902 PDF File

RT9902
RT9902


Overview
Preliminary RT9902 4 Channel DC/DC Converters IC with High-Efficiency Step-Up and Step-Down General Description The RT9902 is a complete power supply solution for digital still cameras and other hand-held devices.
It integrates a high-efficiency main step-up DC-DC converter, two highefficiency step-down converters, a charge pump, and a linear controller that drives an external P-MOSFET for linear www.
DataSheet4U.
com regulator.
The RT9902 is targeted for applications that use either two or three AA cells or a single lithiumion battery.
The main step-up DC-DC converter accepts inputs from 1.
5V to 5.
5V and build in 2.
6A Internal switch.
The two step-down DC-DC converters (CH2, CH3) accept inputs from 1.
5V to 5.
5V and regulate a resistor adjustable output from 0.
8V to 5.
5V.
Each DC-DC converter has independent shutdown input.
The feature of the charge pump is to deliver few current to micro-controller when the system operates in the standby mode.
RT9902 includes a linear controller with 0.
8V reference voltage.
An adjustable operating frequency (up to 1.
4MHz) is utilized to get optimum size, cost, and efficiency.
RT9902 is available in VQFN-32L 5x5 package.
Features z z z z z z z z z z z z z z 1.
5V to 5.
5V Battery Input Voltage Range Main step-up DC-DC Converter `1.
5V to 5.
5V Adjustable Output Voltage `Up to 90% Efficiency `2.
6A, 0.
3Ω Internal Power Switch Two Step-Down DC-DC Converters `0.
8V to 5.
5V Adjustable Output Voltage `94% Efficiency `100% Duty Cycle Step-up Charge Pump for Micro-Controller Linear Controller for Linear Regulator Up to 1.
4MHz Switching Frequency 1μA Supply Current in Shutdown Mode Programmable Soft Start Function Independent Enable Pin (CH1, CH2, CH3) External Compensation Network (CH1, CH2, CH3) Short Circuit Protection (CH1, CH2, CH3) Over Voltage Protection (CH2) 32-Lead VQFN Package RoHS Compliant and 100% Lead (Pb)-Free Applications z z z Ordering Information RT9902 Package Type QV : VQFN-32L 5x5 (V-Type) Operating Temperature Range P...


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