MIC2202 High Efficiency 2MHz Synchronous Buck Converter 1F Stable PWM Regulator General Description Features The Micrel MIC2202 is a high efficiency 2MHz PWM Input voltage range: 2.3V to 5.5V synchronous buck regulator. The fast 2MHz operation Output down to 0.5V/600mA along with a proprietary compensation scheme allows the 2MHz PWM operation smallest possible external components. The MIC2202 can Stable with 1F ceramic output capacitor. operate with a 1F ceramic output capacitor and a small, Ultra-fast transient response (up to 500kHz GBW) low DC-resistance, 2.2H inductor, reducing system size Internal compensation and cost while allowing a high level of efficiency. All ceramic capacitors The MIC2202 operates from 2.3V to 5.5V input and >95% efficiency features internal power MOSFETs that can supply over Fully integrated MOSFET switches 600mA of output current with output voltages down to Easily synchronized to external clock 0.5V. The MIC2202 implements a constant 2MHz pulse- SYNCLOCK feature to daisy chain multiple 2202s width-modu-lation (PWM) control scheme which reduces Requires only 4 external components noise in sensitive RF, audio, and communications 1% line and load regulation applications. Additionally, the MIC2202 can be Logic controlled micropower shutdown synchronized to an external clock, or multiple MIC2202s Thermal shutdown and current limit protection can easily be daisy-chained with the SYNCLOCK feature. 10-pin MSOP and 10-pin 3mm3mm MLF package The MIC2202 has a high bandwidth loop (up to 500kHz) options which allows ultra fast transient response times. This is 40C to +125C junction temperature range very useful when powering applications that require fast dynamic response such as CPU cores and RF circuitry in Applications high performance cellular phones and PDAs. The MIC2202 is available in 10-pin MSOP and 10-pin 3mm Cellular phones 3mm MLF package options with an operating junction PDAs temperature range from 40C to +125C. 802.11 WLAN power supplies Data sheets and support documentation can be found on FPGA/ASIC power supplies Micrels web site at: www.micrel.com. Dynamically adjustable power supply for CDMA/W- CDMA RF power amps DSL modems Tape drives Typical Application 2.2H Efficiency 3.3V V OUT OUT 3.3V 100 600mA 4.2V IN 95 V 1 10 IN 2.3V to 5.5V 10k 90 2 9 5V SYNC IN IN 1F 85 3 8 SYNC OUT 80 4 7 10nF EN 75 L = 2.2H 5 6 C =1F OUT 1.78k 70 65 60 Adjustable Output Synchronous Buck Regulator 0 0.1 0.2 0.3 0.4 0.5 0.6 OUTPUT CURRENT (A) MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc. Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. MIC2202 Ordering Information Part Number Voltage Temperature Range Package Lead Finish MIC2202BMM Adj. 40 to +125C 10-Pin MSOP Standard MIC2202BML Adj. 40 to +125C 10-Pin MLF Standard MIC2202YMM Adj. 40 to +125C 10-Pin MSOP Pb-Free MIC2202YML Adj. 40 to +125C 10-Pin MLF Pb-Free Pin Configuration SW 1 10 GND SW 1 10 GND VIN 2 9 GND VIN 2 9 GND SYNC IN 3 8 GND SYNC IN 3 8 GND SYNC OUT 4 7 BIAS SYNC OUT 4 7 BIAS EN56EP FB EN 5 6 FB 10-Pin MSOP (MM) 10-Pin MLF (ML) Pin Description Pin Number Pin Name Pin Function 1 SW Switch (Output): Internal power MOSFET output switches. 2 VIN Supply Voltage (Input): Requires bypass capacitor to GND. 3 SYNC IN SYNC IN for the MIC2202: Sync the main switching frequency to an external clock. 4 SYNC OUT SYNC OUT an open collector output. 5 EN A low level EN will power down the device, reducing the quiescent current to under 1A. 6 FB Input to the error amplifier, connect to the external resistor divider network to set the output voltage. 7 BIAS Internal circuit bias supply, nominally 2.3V. Must be de-coupled to signal ground with a 0.01F capacitor. 8, 9, 10 GND Ground. EP GND Ground, backside pad. M9999-031907 March 2007 2