MIC4724 Datasheet, PDF (1/19 Pages) Micrel Semiconductor – 3A 2MHz Integrated Switch Buck Regulator with 6Vmax Input

MIC4724
3A 2MHz Integrated Switch
Buck Regulator with 6Vmax Input
General Description
Features
The Micrel MIC4724 is a high efficiency PWM buck (step- • 3.0 to 6.0V supply voltage
down) regulator that provides up to 3A of output current.
The MIC4724 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
MIC4724 allows efficiencies over 92%, reduces external
components count and eliminates the need for an
expensive current sense resistor.
The MIC4724 operates from 3.0V to 6.0V input and the
output can be adjusted down to 1V. The devices can
operate with a maximum duty cycle of 100% for use in low-
dropout conditions.
The MIC4724 is available in 10-pin ePAD 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.
• 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 10-pin ePAD 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
3A 2MHz Buck Regulator
3.3V_OUT Efficiency
96 _4.5VIN
94
5V_IN
92
90
5.5V_IN
88
86
84
82
80
78
760 _{0.5 1 1.5 2 2.5 3}
OUTPUT CURRENT (A)
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
June 2008
M9999-062408-A