Отправил MACTEP.Дата добавления 13.01.2010 (2344 прочтений)
4 MHz Dual 2A Integrated Switch Buck Regulator
General Description The Micrel MIC4744 is a high efficiency dual PWM buck (step-down) regulator that provides dual 2A current output. The MIC4744 operates at 4MHz. A proprietary internal compensation technique allows a closed loop bandwidth of over 200kHz. The low on-resistance internal P-Channel MOSFET of the MIC4744 allows efficiencies over 90%, reduces external components count and eliminates the need for an expensive current sense resistor. The MIC4744 operates from 2.9V to 5.5V input and the output can be ad;usted down to 0.6V. The device can operate with a maximum duty cycle of 100% for use in low-dropout conditions. The MIC4744 is available in the exposed pad 16-pin 3mm x 3mm MLF® and ETSSOP-16 packages with junction operating temperature ranging from -40°C to +125CC. All support documentation can be found on Micrel's web site at:
Features • 2.9 to 5.5V supply voltage • 4MHzPWMmode • 2A Dual output • Greater than 90% efficiency • 100% maximum duty cycle • Output voltage adjustable down to 0.6V • Ultra-fast transient response • Ultra-small external components Stable with a 0.47uH inductor and a 10uF output capacitor • Fully integrated 2A MOSFET switches • Micro-power shutdown • Thermal shutdown and current limit protection • Available in 3mm x 3mm 16-pin MLF® and 16-pin TSSOP packages • -40QC to +125°C junction temperature range Applications • Broadband: xDSL modems • Automotive satellite radios • HD STB, DVD/TV recorder • Computer peripherals: printers and graphic cards • FPGA/ASIC • General point of load
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