MIC2207 Evaluation Board
3mm
×
3mm 2MHz Buck Converter
General Description
The Micrel MIC2207 is a high efficiency PWM buck
(step-down) regulator 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 200 KHz
The low on-resistance internal p-channel MOSFET of
the MIC2207 allows efficiencies over 94% and reduces
external component 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.
Requirements
The MIC2207 evaluation board requires an input power
source that is able to deliver greater than 2.7V at over
3A. The output load can either be an active or passive
source.
Precautions
The evaluation board does not have reverse polarity
protection. Applying a negative voltage to the V
IN
terminal may damage the device.
In addition, the maximum operating voltage of the
MIC2207 evaluation board is 5.5V. Exceeding 6V on the
input could damage the device.
For short circuit
testing, an additional input capacitor over 22uF is
required.
This is preferably an electrolytic, but may be
tantalum or ceramic. When using long test leads to
provide power to the device, the inductance can be over
1uH. During a short circuit condition, the high peak
currents through the test leads may cause the input
voltage to spike and exceed the absolute maximum
rating of 6V, possibly damaging the device.
Getting Started
1.
Connect an external supply to V
IN
. Apply
desired input voltage to the V
IN
and ground
terminals of the evaluation board, paying careful
attention to polarity and supply voltage
(2.7V<V
IN
<5.5V). An ammeter may be placed
between the input supply and the V
IN
terminal to
the evaluation board. Ensure the supply voltage
is monitored at the V
IN
terminal. The ammeter
and/or power lead resistance can reduce the
voltage supplied to the input.
2.
Connect the load to the V
OUT
and ground
terminals.
The load can be either passive
(resistive) or active (as in an electronic load). An
ammeter can be placed between the load and
the V
OUT
terminal. Ensure the output voltage is
monitored at the V
OUT
terminal. The default
output voltage is set to 1.8V. This can be
adjusted by changing the feedback resistors.
See “Output Voltage.”
3.
Enable the MIC2207.
Apply a 1.3V or greater
voltage source to the enable pin.
Typical Application
MIC2207 Evaluation Board Schematic
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
May 2006
M9999-051706
(408) 955-1690
Micrel, Inc.
MIC2207 Evaluation Board
Evaluation Board Schematic
MIC2207 Evaluation Board Schematic
Bill of Materials
Item
C5,C6
C7
C1-4,
C10-12*
C9
C8
D1
L1
R1,R3
Part Number
C2012JB0J106K
GRM219R60J106KE19
08056D106MAT
0402ZD104MAT
0402ZD104MAT
C2012JB0J475K
GRM188R60J475KE19
06036D475MAT
VJ0402A820KXAA
SSA33L
RLF7030-1R0N6R4
744 778 9001
IHLP2525AH-01 1
CRCW04021002F
CRCW04026652F
CRCW04021243F
R4
CRCW04022003F
CRCW04024023F
R3
U1
Notes:
1. TDK: www.TDK.com
2. Murata Tel: www.Murata.com
3. AVX: www.AVX.com
4. Vishay: www.Vishay.com
5. Micrel Semiconductor :www.Micrel.com
†
Manufacturer
TDK
(1)
Murata
AVX
(3)
(3)
(2)
Description
10µF Ceramic Capacitor X5R 0805 6.3V
10µF Ceramic Capacitor X5R 0805 6.3V
10µF Ceramic Capacitor X5R 0805 6.3V
0.1µF Ceramic Capacitor X5R 0402 10V
0.1µF Ceramic Capacitor X5R 0402 10V
4.7µF Ceramic Capacitor X5R 0603 6.3V
4.7µF Ceramic Capacitor X5R 0603 6.3V
4.7µF Ceramic Capacitor X5R 0603 6.3V
82pF Ceramic Capacitor 0402
3A Schottky 30V SMA
1µH Inductor 8.8mΩ 7.1mm (L) x 6.8mm (W) x 3.2mm (H)
1µH Inductor 12mΩ 7.3mm (L) x 7.3mm (W) x 3.2mm (H)
1µH Inductor 17.5mΩ (L) 6.47mm x (W) 6.86mm x (H) 1.8mm
10KΩ1% 0402 resistor
66.5 kΩ 1% 0402 For 2.5V
OUT
124 kΩ 1% 0402 For 1.8 V
OUT
200 kΩ 1% 0402 For 1.5 V
OUT
402 kΩ 1% 0402 For 1.2 V
OUT
Open
For 1.0 V
OUT
Qty.
2
1
*
AVX
AVX
(3)
TDK
AVX
(1)
Murata
(2)
(3)
1
1
1
Vishay VT
(4)
Vishay Semi
(4)
TDK
(1)
Wurth Electronik
Vishay Dale
(4)
1
1
Vishay Dale
(4)
Vishay Dale
(4)
Vishay Dale
(4)
Vishay Dale
(4)
Vishay Dale
(4)
(4)
Vishay Dale
CRCW040210R0F
MIC2207YML
†
Micrel
(5)
1
1
1
Vishay Dale
(4)
10Ω 1% 0402 resistor
2MHz 3A Buck Regulator
Micrel IC = Pb-Free
May 2006
3
M9999-051706
(408) 955-1690
Micrel, Inc.
MIC2207 Evaluation Board
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http:/www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for
its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a
product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for
surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant
injury to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk
and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale.
© 2005 Micrel, Incorporated.
May 2006
4
M9999-051706
(408) 955-1690
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