RT9901 Datasheet | Richtek

Description The RT9901 is a plete 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 voltage detector. The RT9901 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 converters have independent shutdown inputs. The feature of the charge pump is to deliver few current to micro-controller when the system operates in the standby mode. RT9901 include a low battery detector with 0.8V detection voltage. An adjustable operating frequency (up to 1.4MHZ) is utilized to get optimum size, cost, and efficiency. RT9901 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 Build-in 0.8V Voltage Detector Up to 1.4MHz Switching Frequency 1μA Supply Current in Shutdown Mode Programmable Soft Start Function Independent Enable Pin (CH1, CH2, CH3) External pensation Network (CH1, CH2, CH3) Short Circuit Protection (CH1, CH2, CH3) Over Voltage Protection (CH2) 32-Lead VQFN Package Ro HS pliant and 100% Lead (Pb)-Free Applications z z Ordering Information RT9901 Package Type QV : VQFN-32L 5x5 (V-Type) Operating Temperature Range P : Pb Free with mercial Standard G : Green (Halogen Free with mercial Standard) z Digital Still Camera PDAs Portable Device Pin Configurations (TOP VIEW) P2 GND ENM 24 23...