Integrated Switch Buck Regulator - Micrel Semiconductor
Description
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MIC4723
3A 2MHz Integrated Switch Buck Regulator
General Description
The Micrel MIC4723 is a high efficiency PWM buck (stepdown) regulator that provides up to 3A of output current.
The MIC4723 operates at 2.
0MHz and has proprietary internal compensation that allows a closed loop bandwidth of over 200KHz.
The low on-resistance internal p-channel MOSFET of the MIC4723 allows efficiencies over 92%, reduces external components count and eliminates the need for an expensive current sense resistor.
The MIC4723 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 MIC4723 is available in the exposed pad 12-pin 3mm x 3mm MLF® 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 2.
0MHz PWM mode Output current to 3A 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 3A 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
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
MIC4723 3.
3V OUT Efficiency 96 4.
5VIN 5VIN 94 92 90 5.
5VIN 88 86 84 82 80 78 76 0 0.
5 1 1.
5 2 2.
5 OUTPUT CURRENT (A)
3A 2MHz Buck Regulator
3
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Micrel Inc.
• 2180 Fortune Drive • San J...
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