MIC2207
3mmx3mm 2MHz 3A PWM Buck
Regulator
General Description
The Micrel MIC2207 is a high efficiency PWM buck
(step-down) regulators that provides up to 3A of
output current. The MIC2207 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 MIC2207 allows efficiencies over 94%,
reduces external components count and eliminates
the need for an expensive current sense resistor.
The MIC2207 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 MIC2207 is available in the exposed pad 3mm x
3mm MLF-12L package with a junction operating
range from –40°C to +125°C.
Features
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2.7 to 5.5V supply voltage
2MHz PWM mode
Output current to 3A
>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 3mm x 3mm MLF-12L package
–40°C to +125°C junction temperature range
5V or 3.3V Point of Load Conversion
Telecom/Networking Equipment
Set Top Boxes
Storage Equipment
Video Cards
Applications
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Typical Application
96
3.3V
OUT
MIC2207
Efficiency
4.5V
IN
MIC2207
EFFICIENCY (%)
94
92
90
88
86
84
82
80
0
5V
IN
5.5V
IN
3A 2MHz Buck Regulator
0.5
1
1.5
2
2.5
OUTPUT CURRENT (A)
3
Micrel, Inc • 2180 Fortune Drive • San Jose, Ca 95131 • USA • tel +1 (408) 944-0800 • fax +1 (408) 474-1000 • http://www.micrel.com
April 2005
M9999-040705
www.micrel.com
MICREL [ MICREL SEMICONDUCTOR ]
