Microchip | MIC4722YML-TR

The Micrel MIC4722 is a high efficiency PWM buck (step-down) regulator that provides up to 3 A of output current. The MIC4722 operates at 2.7 MHz that makes it suitable for next generation XDSL modems requiring operating frequencies in excess of 2.4 MHz and has proprietary internal compensation that allows a closed loop bandwidth of over 200 KHz.

The low on-resistance internal p-channel MOSFET of the MIC4722 allows efficiencies over 92%, reduces external components count and eliminates the need for an expensive current sense resistor. The MIC4722 operates from 2.7 to 5.5 V input and the output can be adjusted down to 1 V. The devices can operate with a maximum duty cycle of 100% for use in low-dropout conditions. The MIC4722 is available in the exposed pad 12-pin 3 x 3 mm MLF® package with a junction operating range from –40 to +125°C.

Features:

• 2.7 to 5.5 V supply voltage
• 2.7 MHz PWM mode
• Output current to 3 A
• >92 % efficiency
• 100 % maximum duty cycle
• Adjustable output voltage option down to 1 V
• Ultra-fast transient response
• Ultra-small external components Stable with a 1 µH inductor and a 4.7 µF output capacitor
• Fully integrated 3 A MOSFET switch
• Micropower shutdown
• Thermal shutdown and current limit protection
• Pb-free 12-pin 3 x 3 mm MLF® package
• –40 to +125 ºC junction temperature range 

Applications:

• 5 or 3.3 V Point of Load Conversion
• Telecom\Networking Equipment
• Set Top Boxes
• Storage Equipment
• Video Cards