MIC4720 Datasheet | Micrel Semiconductor

Description The Micrel MIC4720 is a high efficiency PWM buck (stepdown) regulator that provides up to 2A of output current. The MIC4720 operates at 2.0MHz and has proprietary internal pensation that allows a closed loop bandwidth of over 200KHz. The low on-resistance internal p-channel MOSFET of the MIC4720 allows efficiencies over 92%, reduces external ponents count and eliminates the need for an expensive current sense resistor. The MIC4720 operates from 2.7V to 5.5V input and the output can be adjusted down to 1V. The devices can operate with a maximum duty cycle of 100% for use in lowdropout conditions. The MIC4720 is available in the exposed pad 12-pin 3mm x 3mm MLF® and 10-pin e Pad MSOP package with a junction operating range from - 40°C to +125°C. Features - - - - - - - - - - - - - - - - - - - - - - - 2.7 to 5.5V supply voltage 2.0MHz PWM mode Output current to 2A Up to 94% efficiency 100% maximum duty cycle Adjustable output voltage option down to 1V Ultra-fast transient response Ultra-small external ponents Stable with a 1µH inductor and a 4.7µF output capacitor Fully integrated 2A MOSFET switch Micropower shutdown Thermal shutdown and current limit protection Pb-free 12-pin 3mm x 3mm MLF® package - 40°C to +125°C junction temperature range Pb-free 10-pin e Pad MSOP package FPGA/DSP/ASIC applications General point of load Broadband munications DVD/TV recorder Point of Sale Printers/Scanners Set Top Boxes puting Peripherals Video Cards Applications Typical Application 100 95 EFFICIENCY (%) MIC4720 3.3V OUT Efficiency VIN = 4.5V V = 5.0V 90 85 80 75 70 0 V = 5.5V OUTPUT CURRENT (A) 2A 2.0MHz Buck Regulator MLF and Micro Lead Frame 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 - http://.micrel. May 2007 M9999-051707 Micrel,...