MPS MP2358DS 2a, 23v, 370khz step-down converter evaluation board Datasheet

TM
EV2358DS-00A
2A, 23V, 370KHz Step-Down Converter
Evaluation Board
The Future of Analog IC Technology
TM
DESCRIPTION
FEATURES
The EV2358DS-00A is the evaluation board for
the MP2358, a monolithic step-down switch
mode converter with a built in internal power
MOSFET. It achieves 2A continuous output
current over a wide input supply range with
excellent load and line regulation.
•
•
The MP2358 employs current mode operation
for fast transient response and loop
stabilization.
Its
Fault
condition
protection
includes
cycle-by-cycle current limiting and thermal
shutdown. In shutdown mode the regulator draws
23µA of supply current. The Programmable softstart minimizes the inrush supply current and the
output overshoot at initial startup.
•
•
2A Output Current
Stable with Low ESR Output Ceramic
Capacitors
Up to 95% Efficiency
Wide 4.75V to 23V Operating Input Range
APPLICATIONS
•
•
•
•
Distributed Power Systems
Battery Charger
DSL Modems
Pre-Regulator for Linear Regulators
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
The MP2358 requires a minimum number of
readily available standard external components.
ELECTRICAL SPECIFICATIONS
Parameter
Input Voltage
Output Voltage
Output Current
Symbol
Value
Units
VIN
VOUT
IOUT
4.75 – 23
3.3
2
V
V
A
EV2358DS-00A EVALUATION BOARD
Efficiency vs
Output Current
95
EFFICIENCY (%)
90
(L x W x H) 2.3” x 1.4” x 0.5”
(cm x cm x cm)
Board Number
MPS IC Number
EV2358DS-00A
MP2358DS
EV2358DS-00A Rev. 1.2
1/9/2006
5.0V
3.3V
85
2.5V
80
75
70
65
60
0
0.5
1.0
1.5
2.0
2.5
OUTPUT CURRENT (A)
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
MP2358_EC01
1
TM
EV2358DS-00A – 2A, 23V, 370KHz STEP-DOWN CONVERTER EVALUATION BOARD
EVALUATION BOARD SCHEMATIC
C1
10nF
VIN
GND
C8
NS
2
1
U1
IN
7
EN
C7
NS
EN
SW
R5
NS
3
D1
B230A-13
MP2358
8
SS
BS
SS
FB
GND
VOUT
3.3V / 2A
C5
NS
GND
5
COMP
4
6
C3
4.7nF
C4
NS
EV2358_S01
EV2358DS-00A BILL OF MATERIALS
Qty
Ref
Value
Description
1
1
1
10nF
10µF
4.7nF
Ceramic Capacitor, 50V, X7R
Ceramic Capacitor, 25V, X7R
Ceramic Capacitor, 50V, X7R
1
1
1
1
1
1
1
1
1
C1
C2
C3
C4, C5,
C7, C8
C6
C9
D1
L1
R1
R2
R3
R4
R5
1
U1
4
EV2358DS-00A Rev. 1.2
1/9/2006
Package Manufacturer
0603
1210
0603
Manufacturer P/N
TDK
C3225X7R1E106M
TDK
Diodes Inc.
Sumida
C3225X5R1C226M
B230A-13
CDRH8D43-150NC
MPS
MP2358DS
Not Stuffed
0.1µF
22µF
Ceramic Capacitor, 16V, X7R
Ceramic Capacitor, 16V, X5R
Diode Schottky, 30V, 2A
15µH Inductor, 2.3A
25.5kΩ Resistor, 1%
7.5kΩ Resistor, 5%
10kΩ Resistor, 1%
100kΩ Resistor, 5%
Not Stuffed
Step-Down Converter, 2A,
370KHz
0603
1210
SMA
SMD
0603
0603
0603
0603
SO8
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
2
TM
EV2358DS-00A – 2A, 23V, 370KHz STEP-DOWN CONVERTER EVALUATION BOARD
PRINTED CIRCUIT BOARD LAYOUT
Figure 1—Top Silk Layer
Figure 2—Top Layer
Figure 3—Bottom Layer
EV2358DS-00A Rev. 1.2
1/9/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
3
TM
EV2358DS-00A – 2A, 23V, 370KHz STEP-DOWN CONVERTER EVALUATION BOARD
QUICK START GUIDE
The output voltage of this board is preset to 3.3V. The board is laid out to accommodate most
commonly used inductors and output capacitors.
1. Connect the positive and negative ends of the load to the VOUT and GND pins, respectively.
2. Connect the input voltage (4.75V ≤ VIN ≤ 23V) and input ground to the VIN and GND pins,
respectively.
3. To turn on the MP2358, apply an enable voltage VEN to the EN pin. Drive EN higher than 1V to
turn on the MP2358 or lower than 0.4V to turn it off.
4. The output voltage VOUT can be programmed by varying R1. Calculate the new value using the
formula:
R1 = R3 × (
VOUT
− 1)
VFB
Where VFB = 0.9V and R3 = 10kΩ.
For example, for VOUT = 2.5V:
R1 = R3 × (
VOUT
2 .5 V
− 1) = 10kΩ × (
− 1) = 17.78kΩ ~ 17.8kΩ
VFB
0. 9 V
for the closest standard 1% value.
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.
EV2358DS-00A Rev. 1.2
1/9/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
4
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