MIC4744

MIC4744 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 adjusted down to 0.6V. The device can operate with a maximum duty cycle of 100% for use in lowdropout 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 +125°C. All support documentation can be found on Micrel’s web site at: www.micrel.com. Features 2.9 to 5.5V supply voltage 4MHz PWM mode 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 0.47µH inductor and a 10µF 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 –40°C to +125°C junction temperature range Applications Broadband: xDSL modems Automotive satellite radios ...