MIC4723 Datasheet, PDF (1/19 Pages) Micrel Semiconductor – 3A 2MHz Integrated Switch Buck Regulator

MIC4723
3A 2MHz Integrated Switch
Buck Regulator
General Description
Features
The Micrel MIC4723 is a high efficiency PWM buck (step-
down) 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 low-
dropout 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.
• 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
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
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
MIC4723
3.3V_OUT Efficiency
96
94 ^4.5VIN
5V_IN
92
90
5.5V_IN
88
86
84
82
80
78
76
0 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
May 2007
1
M9999-052307-A