MP2108DK [MPS]
2A, 6V, 720KHz Synchronous Buck Converter; 2A ， 6V ， 720kHz的同步降压转换器
| 型号： | MP2108DK |
| 厂家： | 
MONOLITHIC POWER SYSTEMS |
| 描述： | 2A, 6V, 720KHz Synchronous Buck Converter |
| 文件： | 总4页 (文件大小：171K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TM
EV2108DQ/DK-00A
2A, 6V, 720KHz
Synchronous Buck Converter
TM
The Future of Analog IC Technology
EVALUATION BOARD
DESCRIPTION
FEATURES
The EV2108DQ/DK-00A is the evaluation board
for the MP2108, a 2A, 720KHz synchronous
buck converter designed for low voltage
applications requiring high efficiency.
•
•
•
2A Output Current
Input Voltage Range of 2.6V to 6V
Over 90% Efficiency
APPLICATIONS
The MP2108 is capable of providing an output
voltage as low as 0.9V and integrates top and
bottom switches to minimize power loss and
component count. The 720KHz switching
frequency reduces the size of filtering
components for a small solution size.
•
•
•
•
SOHO Routers, PCMCIA Cards, Mini PCI
Handheld Computers, PDAs
Cell phones, Digital Still and Video Cameras
Small LCD Displays
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
The MP2108 includes cycle-by-cycle current
limiting and under voltage lockout. The 10-pin
MSOP package is available on the
EV2108DK-00A while the 10-pin 3mm x 3mm
QFN
package
is
available
on
the
EV2108DQ-00A.
ELECTRICAL SPECIFICATIONS
Parameter
Symbol
Value
2.6 – 6
1.8
Units
Input Voltage
Output Voltage
Output Current
VIN
V
V
A
VOUT
IOUT
2
EV2108DQ/DK-00A EVALUATION BOARD
Dimensions (2.5”X x 2.0”Y x 0.5”Z)
Board Number
MPS IC Number
EV2108DQ/DK-00A
MP2108DQ/DK
EV2108DQ/DK-00A Rev. 1.0
3/2/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
1
TM
EV2108DQ/DK-00A – 2A, 6V, 720KHz SYNCHRONOUS BUCK CONVERTER
EVALUATION BOARD
EVALUATION BOARD SCHEMATIC
VOUT
D2
Opt.
VIN
C3
10nF
D3
Opt.
VIN
C1
NS
GND
U1
2
1
VIN
BST
VOUT
GND
10
6
3
EN
RUN
LX
C6
NS
R5
NS
D1
1N5819
C11
NS
C9
NS
SS
MP2108
7
8
COMP
FB
VREF SGND PGND
C5
3.3nF
9
5
4
C10
10nF
C4
NS
C7
10nF
EV2108_S01
EV2108DQ/DK-00A BILL OF MATERIALS
Qty
Ref
Value Description
Package Manufacturer Manufacturer P/N
C1, C4, C6,
C9, C11
5
NS
Not Stuffed
1
3
1
1
1
2
1
1
1
2
1
C2
10µF Ceramic Cap, 10V, X5R
SM1210 TDK
C3225X5R1A106K
C2012X7R1H103K
ECJ-2VB1H332K
C3225X5R0J226M
1N5819HW-7
C3, C7, C10 10nF Ceramic Cap, 50V, X7R
SM0805 TDK
C5
C8
3.3nF Ceramic Cap, 50V, X7R
22µF Ceramic Cap, 6.3V, X5R
Schottky Diode, 40V, 1A
Do Not Stuff
SM0805 Panasonic
SM1210 TDK
D1
SOD123 Diodes Inc
D2, D3
L1
5µH Inductor, 2.2A
100kΩ Resistor, 5%
6.8kΩ Resistor, 5%
SMD
Sumida
CDRH6D26-5R0
ERJ-6GEYJ104V
ERJ-6GEYJ682V
ERJ-6ENF1002V
R1
SM0805 Panasonic
SM0805 Panasonic
SM0805 Panasonic
R2
R3, R4
R5
10kΩ Resistor, 1%
NS
Not Stuffed
MSOP10/
QFN10
1
U1
DC-DC Converter
MPS
MP2108DQ/DK
EV2108DQ/DK-00A Rev. 1.0
3/2/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
2
TM
EV2108DQ/DK-00A – 2A, 6V, 720KHz SYNCHRONOUS BUCK CONVERTER
EVALUATION BOARD
PRINTED CIRCUIT BOARD LAYOUT
Figure 1—Top Silk Layer
Figure 2—Top Layer
Figure 3—Bottom Layer
EV2108DQ/DK-00A Rev. 1.0
3/2/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
3
TM
EV2108DQ/DK-00A – 2A, 6V, 720KHz SYNCHRONOUS BUCK CONVERTER
EVALUATION BOARD
QUICK START GUIDE
The output voltage of this board is set to 1.8V. The board layout accommodates most commonly used
inductors and output capacitors.
1. Attach the positive and negative ends of the load to the VOUT and GND pins, respectively.
2. Attach the input voltage (2.6V ≤ VIN ≤ 6V) and input ground to the IN and GND pins,
respectively.
3. A pull-up resistor has connected the RUN pin to the VIN pin, so the MP2108 will startup
automatically without applying an external voltage to the RUN pin.
4. The output voltage VOUT can be changed by varying R3. Calculate the new value using the
formula:
VOUT
R3 = R4 × (
− 1)
VFB
where VFB = 0.9V and R4 = 10kΩ.
For example, for VOUT = 2.5V:
VOUT
VFB
2.5V
0.9V
R3 = R4 × (
− 1) = 10kΩ × (
− 1) = 17.78kΩ ~ 17.8kΩ
for the closest standard 1% value.
See Maximum Duty Cycle limits to determine allowable output voltages.
The optional bootstrap diode (D3) may be added for improved efficiency.
NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications.
Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS
products into any application. MPS will not assume any legal responsibility for any said applications.
EV2108DQ/DK-00A Rev. 1.0
3/2/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
4
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