Отправил MACTEP.Дата добавления 13.01.2010 (2584 прочтений)
2 MHz Dual 2A Integrated Switch Buck Regulator
General Description The Micrel MIC4742 is a high efficiency dual PWM buck (step-down) regulator that provides dual 2A current output. The MIC4742 operates at 2MHz. A proprietary internal compensation technique allows a closed loop bandwidth of over 200kHz. The low on-resistance internal P-Channel MOSFET of the MIC4742 allows efficiencies over 92%, reduces external components count and eliminates the need for an expensive current sense resistor. The MIC4742 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 MIC4742 is available in the exposed pad 16-pin 3mm x 3mm MLF® and EPAD TSSOP-16 packages with a junction operating range from -40CC to +125CC. All support documentation can be found on Micrel's web site at:
Features 2.9 to 5.5V supply voltage 2MHzPWMmode 2A Dual output Greater than 92% efficiency 100% maximum duty cycle Adjustable output voltage option down to 0.6V Ultra-fast transient response Ultra-small external components Stable with a 1uH inductor and a 4.7uF output capacitor Fully integrated 2A MOSFET switches Micro-power shutdown Thermal shutdown and current limit protection Available in a 3mm x 3mm 16-pin MLF® and 16-pin TSSOP -40°C 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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