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PDF EV0060 Data sheet ( Hoja de datos )
| Número de pieza | EV0060 | |
| Descripción | Synchronous Rectified Step-Down Converter | |
| Fabricantes | MPS | |
| Logotipo |  |
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The Future of Analog IC Technology
EV0060 (MP1567)
1.2A, 6V, 800KHz Synchronous Rectified
Step-Down Converter
EVALUATION BOARD
GENERAL DESCRIPTION
The EV0060 is an evaluation board for the
MP1567, a 1.2A, 800KHz DC to DC converter
designed for low voltage applications requiring
high efficiency. Capable of providing output
voltages as low as 0.9V from a 3.3V supply
voltage, the MP1567 eliminates the need for a
5V rail, providing over 90% efficiency via
synchronous rectification and eliminating heat
issues in confined spaces. Soft-start operation
protects internal circuitry from hard turn on
issues. Switching at 800KHz reduces the size
of external components and thereby reduces
board space.
The MP1567 includes cycle-by-cycle current
limiting and under voltage lockout. Internal
power switches combined with the tiny 10-pin
QFN package provide a solution requiring a
minimum of space.
ELECTRICAL SPECIFICATIONS
Parameter
Input Voltage
Output Voltage
Output Current
Symbol
VIN
VOUT
IOUT
Value
2.6 to 6
1.8
1.2
Units
V
V
A
FEATURES
• 1.2A Output Current
• Synchronous Rectified
• Internal 180mΩ and 220mΩ Power Switches
• VIN Range of 2.6V to 6V
• Over 90% Efficiency
• Zero Current Shutdown Mode
• Under Voltage Lockout Protection
• Soft-Start Operation
• Thermal Shutdown
• Internal Current Limit (Source & Sink)
• Tiny 10-Pin QFN Package
APPLICATIONS
• SOHO Routers, PCMCIA Cards, Mini PCI
• Handheld Computers, PDAs
• Cell Phones
• Digital Video Cameras
• Small LCD Displays
“MPS” and “The Future of Analog IC Technology”, are Registered Trademarks
of Monolithic Power Systems, Inc.
EV0060 EVALUATION BOARD
Dimensions (2.5”X x 2.0”Y x 0.4”Z)
Board Number
EV0060
MPS IC Number
MP1567DQ
Efficiency vs
Load Current
100
90 VIN=3.3V
80
70
60 VIN=4V
50
40 VIN=5V
30
20
10 VOUT=1.8V
0
10 100 1000
LOAD CURRENT (mA)
MP1567_EC01
EV0060 Rev. 1.2
4/22/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
1
1 page  
EV0060 – 1.2A, 6V, 800KHz SYNCHRONOUS RECTIFIED STEP-DOWN 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 OUT and GND pins respectively.
2. Attach an input voltage 2.6V ≤ VIN ≤ 6V and the input ground to the IN and GND pins,
respectively.
3. To enable the MP1567 apply a voltage, 2V ≤ VEN ≤ 6V, to the EN pin. To disable the MP1567
connect the EN pin to ground.
4. The output voltage VOUT can be changed by varying R3. Calculate the new value using the
formula:
R3
=
R4
×
⎜⎜⎝⎛
VOUT
VFB
− 1⎟⎟⎠⎞
Where VFB = 0.9V and R4 = 10kΩ.
For example, for VOUT = 2.5V:
R3
=
R4
×
⎜⎜⎝⎛
VOUT
VFB
−
1⎟⎟⎠⎞
=
10kΩ
×
⎜⎛
⎝
2.5V
0.9V
− 1⎟⎞ = 17.78kΩ
⎠
Therefore use a standard 1% value 17.8kΩ resistor.
Note: See Maximum Duty Cycle limits to determine allowable output voltages.
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.
EV0060 Rev. 1.2
4/22/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
5
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| Páginas | Total 5 Páginas | |
| PDF Descargar | [ Datasheet EV0060.PDF ] | |
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