MPS EV1542DK-00A

TM
EV1542DK-00A
700KHz/1.3MHz Boost Converter
with a 2A Switch
The Future of Analog IC Technology
TM
EVALUATION BOARD
GENERAL DESCRIPTION
FEATURES
The EV1542DK-00A is the evaluation board for
the MP1542, a current mode step-up converter
with a 2A, 0.18Ω internal switch to provide a
highly efficient regulator with quick response.
The MP1542 can be operated at 700KHz or
1.3MHz allowing for easy filtering and low
noise. An external compensation pin gives the
user flexibility in setting loop dynamics, which
allows the use of small, low-ESR ceramic
output capacitors. Soft-start results in small
inrush current and can be programmed with an
external capacitor. The MP1542 operates from
an input voltage as low as 2.5V and can
generate 12V at up to 500mA from a 5V supply.
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The MP1542 includes under-voltage lockout,
current limiting and thermal overload protection
preventing damage in the event of an output
overload. The MP1542 is available in a low
profile 8-pin MSOP package.
•
•
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2A, 0.18Ω, 25V Power MOSFET
Uses Tiny Capacitors and Inductors
Pin Selectable 700KHz or 1.3MHz Fixed
Switching Frequency
Programmable Soft-Start
Operates with Input Voltage as Low as 2.5V
and Output Voltage as High as 22V
12V at 500mA from 5V Input
UVLO, Thermal Shutdown
Internal Current Limit
Available in an 8-Pin MSOP Package
APPLICATIONS
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LCD Displays
Portable Applications
Handheld Computers and PDAs
Digital Still and Video Cameras
“MPS” and “Monolithic Power Systems”, are Trademarks of Monolithic
Power Systems, Inc.
ELECTRICAL SPECIFICATIONS
Parameter
Input Voltage
Output Voltage
Output Current
Symbol
Value
Units
VIN
VOUT
IOUT
2.5 – 6
8
400
V
V
mA
EV1542DK-00A EVALUATION BOARD
Efficiency vs
Load Current
95
EFFICIENCY (%)
90
85
80
75
70
65
60
VIN = 3.3V
VOUT = 8V
55
Dimensions (2.0”X x 2.0”Y x 0.4”Z)
Board Number
MPS IC Number
EV1542DK-00A
MP1542DK
EV1542DK-00A Rev. 1.2
6/8/2005
50
1
10
100
LOAD CURRENT (mA)
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
1000
MP1542-EC02
1
TM
EV1542DK-00A — 700KHz/1.3MHz BOOST CONVERTER WITH A 2A SWITCH
EVALUATION BOARD
EVALUATION BOARD SCHEMATIC
D1
1N5819HW-7
VIN
5V
JP1
1
3
2
OFF ON
6
7
3
8
5
IN
FSEL
EN
SS
VOUT
8V
SW
FB
2
MP1542
GND
COMP
1
4
C4
10nF
C3
2.2nF
C5
NS
EV1542_S01
EV1542DK-00A BILL OF MATERIALS
Qty
Ref
Value
Description
Package
2
C1, C2
10µF
Ceramic Capacitor, 10V, X7R
1210
AVX
1210ZC106KAT2A
1
C3
2.2nF
Ceramic Capacitor, 50V, X7R
0805
AVX
08055C222KAT2A
1
C4
10nF
Ceramic Capacitor, 50V, X7R
0805
AVX
08055C103KAT2A
1
C5
Not Stuffed
1
D1
Schottky Diodes, 40V, 1A
SOD123
Diodes Inc
1N5819HW-7
1
JP1
1
L1
4.7µH
1
R1
53.6kΩ Film Resistor, 1%
2
R2, R3
10kΩ
2
R4, R5
1
U1
3-Pin Connector Header, 0.100
Manufacturer Manufacturer P/N
Sullins
PTC03SAAN
SMD
Toko
A915AY-4R7M
0805
Panasonic
ERJ-6ENF5362V
Film Resistor, 1%
0805
Panasonic
ERJ-6ENF1002V
100kΩ Film Resistor, 5%
0805
Panasonic
ERJ-6GEYJ104V
MSOP-8
MPS
MP1542
EV1542DK-00A Rev. 1.2
6/8/2005
2.01A, D53LC
DC-DC Converter
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
2
TM
EV1542DK-00A — 700KHz/1.3MHz BOOST CONVERTER WITH A 2A SWITCH
EVALUATION BOARD
PRINTED CIRCUIT BOARD LAYOUT
Figure 1—Top Silk Layer
Figure 2—Top Layer
Figure 3—Bottom Layer
EV1542DK-00A Rev. 1.2
6/8/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
3
TM
EV1542DK-00A — 700KHz/1.3MHz BOOST CONVERTER WITH A 2A SWITCH
EVALUATION BOARD
QUICK START GUIDE
The output voltage of this board is set to 8V. The board layout accommodates most commonly used
inductors and output capacitors.
1. Preset Power Supply to 2.5V ≤ VIN ≤ 6V.
2. Turn Power Supply off.
3. Connect Power Supply terminals to:
a. Positive (+): IN, EN
b. Negative (–): GND
4. Connect Load to:
a. Positive (+): OUT
b. Negative (–): GND
5. Turn Power Supply on after making connections.
6. The MP1542 is enabled on the evaluation board once VIN is applied. To disable the MP1542,
disconnect EN from IN.
7. The output voltage VOUT can be changed by varying R1. Calculate the new value using the
fomula:
⎛V
⎞
R1 = ⎜⎜ OUT − 1⎟⎟R2
⎝ VFB
⎠
Where VFB = 1.25V and R2 = 10kΩ
For example, for VOUT = 12V
⎛ 12V
⎞
− 1⎟ × 10kΩ = 86kΩ
R1 = ⎜
⎝ 1.25 V
⎠
Therefore use an 86.6kΩ standard 1% value.
For output voltages greater than 10V, the output capacitor C2 needs to be replaced with a
capacitor with a higher voltage rating suitable for the new output voltage.
8. The switching frequency is set to 1.3MHz if jumper JP1 is shunted between 1 and 2. To get
700KHz operation, shunt JP1 between 2 and 3.
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.
EV1542DK-00A Rev. 1.2
6/8/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
4