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PDF EV1570DN-00A Data sheet ( Hoja de datos )
| Número de pieza | EV1570DN-00A | |
| Descripción | 340KHz Synchronous Step-Down Converter | |
| Fabricantes | MPS | |
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The Future of Analog IC Technology
GENERAL DESCRIPTION
The EV1570DN-00A is the evaluation board of
MPS’ MP1570 synchronous buck converter. It
has a wide supply range from 4.75V to 23V and
a continuous output current up to 3A. It features
synchronous rectification for high efficiency with
integrated high-side and low-side power
MOSFETs. The output voltage is set to 3.3V,
but can be easily adjusted to other levels from
1.22V. Current mode control and integrated
power MOSFETs minimize component counts,
board area, and solution cost. Fault condition
protections include cycle-by-cycle current limiting,
thermal shutdown, over voltage protection and
under voltage lockout. Internal soft-start reduces
turn-on stress. Small but thermally enhanced
SO-8 package minimizes board area with
excellent thermal management.
ELECTRICAL SPECIFICATIONS
Parameter
Supply Voltage
Output Voltage
Output Current
Symbol
VIN
VOUT
IOUT
Value
4.75 to 23
3.3
0 to 3
Units
V
V
A
EV1570DN-00A
3A, 23V, 340KHz
Synchronous Step-Down Converter
EVALUATION BOARD – INITIAL RELEASE
FEATURES
• Up to 3A Output Current
• Wide 4.75V to 23V Operating Input Range
• Monolithic Synchronous Buck with 100mΩ
High-Side and Low-Side FETs
• Fixed 340KHz Frequency
• All Ceramic Input and Output Capacitors
• Programmable Soft-Start
• Programmable Input Under Voltage Lockout
APPLICATIONS
• Distributed Power Systems
• Pre-Regulator for Linear Regulators
• Notebook Computers
“MPS” and “The Future of Analog IC Technology” are Registered
Trademarks of Monolithic Power Systems, Inc.
EV1570DN-00A EVALUATION BOARD
(2”X x 1.5”Y x 0.5”Z)
Board Number
EV1570DN-00A
MPS IC Number
MP1570
Efficiency vs
Load Current
100
95 VIN = 5V
90
85
80 VIN = 12V
75
70
65
60 VIN = 23V
55
50
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
LOAD CURRENT (A)
MP1570-EC01
EV1570DN-00A Rev. 1.1
4/6/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
1
1 page  
EV1570DN-00A – 3A, 23V, 340KHz SYNCHRONOUS STEP-DOWN CONVERTER
EVALUATION BOARD – INITIAL RELEASE
QUICK START GUIDE
1. Connect the positive terminal of the load to VOUT pins, and the negative terminal of the load to
GND pins.
2. Preset power supply output to 4.75V to 23V and turn off the power supply.
3. Connect the positive terminal of the power supply output to VIN pin, and the negative terminal of
the power supply output to GND pin.
4. Turn power supply on and the MP1570 will automatically startup.
5. To use Enable function, apply a digital input to EN pin. Drive EN higher than 2.5V to turn on the
regulator, drive EN less than 0.7V to turn it off.
6. An under voltage lockout (UVLO) function can be implemented by the addition of a resistor
divider
R4
and
R5.
The
EN
threshold
is
2.5V,
so
VIN
UVLO
threshold
is:
⎜⎛1 +
⎝
R4
R5
⎟⎞
⎠
×
2.5V
.
RECOMMENDED COMPONENTS FOR STANDARD OUTPUT VOLTAGES
The output voltage of this board is set to 3.3V. This board is laid out to accommodate most commonly
used inductors and output capacitors and to be programmed for most standard output voltages. The
following table lists recommended components for some standard output voltages. Listed
compensation components (R2, C3) values are based on the output capacitor installed on this board.
For other capacitors, refer to the Application Information section of the MP1570 datasheet..
VOUT
1.8V
2.5V
3.3V
5V
12V
R1
4.75kΩ
10.5kΩ
16.9kΩ
30.9kΩ
88.7kΩ
R2
5.6kΩ
4.7kΩ
5.6kΩ
7.5kΩ
10kΩ
C3
3.3nF
4.7nF
3.3nF
3.3nF
1.2nF
L1
4.7µH
4.7µH to 6.8µH
6.8µH to 10µH
10µH to 15µH
15µH to 22µH
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.
EV1570DN-00A Rev. 1.1
4/6/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
5
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