Integrated Switch Buck Regulator - Micrel Semiconductor
Description
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MIC4721
1.
5A 2MHz Integrated Switch Buck Regulator
General 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 compensation 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 components 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: www.
micrel.
com.
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 components 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 communications • DVD/TV recorders • Point of sale • Printers/Scanners • Set top boxes • Computing 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://www.
micrel.
com...
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