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RT9201 Datasheet(PDF) 1 Page - Richtek Technology Corporation |
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RT9201 Datasheet(HTML) 1 Page - Richtek Technology Corporation |
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1 / 13 page  RT9201 1 DS9201-12 August 2007 www.richtek.com Pin Configurations High Efficiency PWM Step-Down DC-DC Converter Ordering Information Features l +2.5V to +5.5V Input Range l Adjustable Output From 0.85V to VIN l 600mA Output Current l 95% Efficiency l No Schottky Diode Required l 85 µA Quiescent Current l 100% Duty Cycle in Low-Dropout Mode l 800kHz Fixed-Frequency PWM Operation l Pulse-skipping Mode Operation During Light Ioad l RoHS Compliant and 100% Lead (Pb)-Free Applications l Cellular Telephones l Wireless Modems l Personal Information Appliances l Portable Instruments l Distributed Power Systems l Battery-Powered Equipment (1 Li-Ion or 3 NiMH/NiCd) (TOP VIEW) VDFN-10L 3x3 General Description The RT9201 is a high-efficiency pulse-width-modulated (PWM) step-down DC-DC converter. Capable of delivering 600mA output current over a wide input voltage range from 2.5 to 5.5V, the RT9201 is ideally suited for portable electronic devices that are powered from 1-cell Li-ion battery or from other power sources within the range such as cellular phones, PDAs and handy-terminals. Four operational modes are available: PWM, PSM, Low- Dropout and shut-down modes. Internal synchronous rectifier with low RDS(ON) dramatically reduces conduction loss at PWM mode. No external Schottky diode is required in practical application. The RT9201 auto- matically turns off the synchronous rectifier while the inductor current is low and enters discontinuous PWM mode. This can increase efficiency at light load condition. The RT9201 enters PSM (pulse-skipping mode) at extremely light load condition. The equivalent switching frequency is reduced to increase the efficiency in PSM. The RT9201 enters Low-Dropout mode when normal PWM cannot provide regulated output v oltage by continuously turning on the upper P-MOSFET. RT9201 enters shut-down mode and consumes less than 0.1 µA when EN pin is pulled low. The switching ripple is easily smoothed-out by small package filtering elements due to a fixed operation frequency of 800kHz. This along with small VDFN package provides small PCB area application. Other features include soft start, 0.8V internal reference voltage with 1% accuracy, over temperature protection, and over current protection. 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. RT9201 Package Type QV : VDFN-10L 3x3 (V-Type) Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commer- cial Standard) NC VDD PVDD PGND LX EN SS FB GND NC 9 8 7 1 2 3 4 5 10 GND 11 |
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