MIC4720 Datasheet, PDF (1/21 Pages) Micrel Semiconductor – 3mm x 3mm 2.0MHz 2A Integrated Switch Buck Regulator

MIC4720
3mm x 3mm 2.0MHz 2A Integrated
Switch Buck Regulator
General Description
The Micrel MIC4720 is a high efficiency PWM buck (step-
down) regulator that provides up to 2A of output current.
The MIC4720 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
MIC4720 allows efficiencies over 92%, reduces external
components count and eliminates the need for an
expensive current sense resistor.
The MIC4720 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 low-
dropout conditions.
The MIC4720 is available in the exposed pad 12-pin
3mm x 3mm MLF^® and 10-pin ePad MSOP package with a
junction operating range from –40°C to +125°C.
Features
• 2.7 to 5.5V supply voltage
• 2.0MHz PWM mode
• Output current to 2A
• 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 2A 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
• Pb-free 10-pin ePad MSOP package
Applications
• FPGA/DSP/ASIC applications
• General point of load
• Broadband communications
• DVD/TV recorder
• Point of Sale
• Printers/Scanners
• Set Top Boxes
• Computing Peripherals
• Video Cards
Typical Application
MIC4720
2A 2.0MHz Buck Regulator
MIC4720
3.3V Efficiency
100
OUT
V = 4.5V
95
IN
90 _{V = 5.0V}
IN
85
V = 5.5V
IN
80
75
70
65
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
May 2007
M9999-051707