MIC4721 Datasheet | Micrel Semiconductor

Description The Micrel MIC4721 is a high efficiency PWM buck (stepdown) regulators that provides up to 1.5A of output current. The MIC4721 operates at 2MHz and has proprietary internal pensation that allows a closed loop bandwidth of over 200KHz. The low on-resistance internal p-channel MOSFET of the MIC4721 allows efficiencies up to 94%, reduces external ponents count and eliminates the need for an expensive current sense resistor. The MIC4721 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 MIC4721 is available in the 10-pin MSOP package with a junction operating range from - 40°C to +125°C. Data sheets and support documentation can be found on Micrel’s web site at: .micrel.. Features - - - - - - - - - - - - - - 2.7 to 5.5V supply voltage 2MHz PWM mode Output current to 1.5A 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 1.5A MOSFET switch Micropower shutdown Power Good pin Thermal shutdown and current limit protection Pb-free 10-pin MSOP package - 40°C to +125°C junction temperature range Applications - FPGA/DSP/ASIC applications - General point of load - Broadband munications - DVD/TV recorders - Point of sale - Printers/Scanners - Set top boxes - puting peripherals - Video cards ___________________________________________________________________________________________________________ Typical Application 5V IN to 3.3VO Efficiency 94 92 90 88 86 84 82 80 78 76 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 OUTPUT CURRENT (A) 1.5A 2MHz Buck Regulator Micrel Inc. - 2180 Fortune Drive - San Jose, CA 95131 - USA - tel +1 (408) 944-0800 - fax + 1 (408) 474-1000 - http://.micrel. May 2007 M9999-052907-A Micrel, Inc. Ordering Information Part Number MIC4721YMM Voltage...