MPS MP1542DK 700khz/1.3mhz boost converter with a 2a switch Datasheet

TM
EV1542DK-SEPIC-00A
700KHz/1.3MHz Boost Converter
with a 2A Switch
The Future of Analog IC Technology
TM
EVALUATION BOARD
GENERAL DESCRIPTION
FEATURES
The EV1542DK-SEPIC-00A is the demo board
for sepic applications using the MP1542, a
current mode step up converter with a 2A,
0.18Ω internal switch to provide a highly
efficient regulator with fast response. The
EV1542DK-SEPIC-00A 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. The soft-start
results in small inrush current and can be
programmed with an external capacitor. The
EV1542DK-SEPIC-00A can operate from a
single Li-Ion battery to generate 3.3V at up to
500mA.
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•
Other features include under voltage lockout,
current limiting and thermal overload protection,
all available in a low profile 8-pin MSOP
package.
“MPS” and “Monolithic Power Systems”, are Trademarks of Monolithic
Power Systems, Inc.
•
•
•
•
•
Automatic Up-Down Conversion
Operates from a Single Li-Ion Battery to
Generate 3.3V at up to 500mA
Uses Tiny Capacitors and Inductors
Pin Selectable 700KHz or 1.3MHz Fixed
Switching Frequency
Programmable Soft-Start
UVLO, 2A Switch, Thermal Shutdown
Internal Current Limit
APPLICATIONS
•
•
•
•
LCD Displays
Portable Applications
Handheld Computers and PDAs
Digital Still and Video Cameras
ELECTRICAL SPECIFICATIONS
Parameter
Symbol
Value
Units
VIN
VOUT
IOUT
3 – 4.2
3.3
500
V
V
mA
Input Voltage
Output Voltage
Output Current
EV1542DK-SEPIC-00A EVALUATION BOARD
Efficiency vs
Load Current
90
EFFICIENCY (%)
80
VIN=4.2V
70
VIN=3.6V
60
50
VIN=3V
40
30
20
Dimensions (2.0”X x 2.0”Y x 0.0”Z)
Board Number
MPS IC Number
EV1542DK-SEPIC-00A
MP1542DK
10
0
1
10
100
LOAD CURRENT (mA)
1000
EV1542_EC02
EV1542DK-SEPIC-00A Rev. 1.0
www.MonolithicPower.com
6/15/2005
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
1
TM
EV1542DK-SEPIC-00A — 700KHz/1.3MHz SEPIC CONVERTER WITH A 2A SWITCH
EVALUATION BOARD
EVALUATION BOARD SCHEMATIC
VIN
3V - 4.2V
GND
T1
COOPER
DRQ73-3R3
D2
1N4148
D1
1N5819HW-7
6
3
EN
IN
EN
SW
5
VOUT
3.3V
0.5A
C2B
NS
JP1
FREQUENCY
SELECTION
7
FSEL
MP1542
FB
2
GND
8
SS
C4
22nF
GND
U1
COMP
1
4
C6
NS
C3
1nF
EV1542-SEPIC_S01
EV1542DK-SEPIC-00A BILL OF MATERIALS
Qty
Ref
Value
Description
2
C1A, C1B
10µF
Ceramic Cap, 6.3V, X5R
1210
TDK
C3225X5R1A106K
1
C2A
22µF
Ceramic Cap, 6.3V, X5R
1210
TDK
C3225X5R0J226M
1
C3
1nF
Ceramic Cap, 50V, X7R
0805
TDK
C2012X7R1H102K
1
C4
22nF
Ceramic Cap, 100V, X7R
0805
TDK
C2012X7R2A223M
1
C5
4.7µF
Ceramic Cap, 10V, Y5V
0805
TDK
C2012Y5V1A475Z
2
C6, C2B
NS
Not Stuffed
1
C7
1µF
Ceramic Cap, 10V, X5R
0805
TDK
C2012X5R1A105K
1
D1
Schottky Diode, 40V, 1A
SOD-123
Diodes Inc
1N5819HW-7
1
D2
Rectifier Diode, 75V, 200mW
SOD-323
Diodes Inc
1N4148WS-7
1
JP1
3-Pin Connector Header, 0.100
Sullins
PTC03SAAN
1
L1
3.3µH
Transformer, 1.66A
Cooper
DRQ73-3R3
1
R1
16.4kΩ Metal Film Resistor, 1%
0805
Panasonic
ERJ-6ENF1642V
1
R2
10kΩ
Metal Film Resistor, 1%
0805
Panasonic
ERJ-6ENF1002V
1
R3
20kΩ
Metal Film Resistor, 5%
0805
Panasonic
ERJ-6GEYJ203V
2
R4, R5
100kΩ Metal Film Resistor, 5%
0805
Panasonic
ERJ-6GEYJ104V
1
U1
MSOP8
MPS
MP1542DK
DC-DC Converter
Package Manufacturer
EV1542DK-SEPIC-00A Rev. 1.0
www.MonolithicPower.com
6/15/2005
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
Manufacturer P/N
2
TM
EV1542DK-SEPIC-00A — 700KHz/1.3MHz SEPIC 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-SEPIC-00A Rev. 1.0
www.MonolithicPower.com
6/15/2005
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
3
TM
EV1542DK-SEPIC-00A — 700KHz/1.3MHz SEPIC CONVERTER WITH A 2A SWITCH
EVALUATION BOARD
QUICK START GUIDE
The output voltage of this board is set to 3.3V. The board layout accommodates most commonly used
inductors and output capacitors.
1. Preset the power supply to 3V ≤ VIN ≤ 6V.
2. Turn the power supply off.
3. Connect the power supply terminals to:
a. Positive (+): VIN, EN
b. Negative (–): GND
4. Connect the load to:
a. Positive (+): VOUT
b. Negative (–): GND
5. Turn on the power supply 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
formula:
⎛V
⎞
R1 = ⎜⎜ OUT − 1⎟⎟R2
⎝ VFB
⎠
Where VFB = 1.25V and R2 = 10kΩ
For example, for VOUT = 5V
⎛ 5V
⎞
− 1⎟ × 10kΩ = 30kΩ
R1 = ⎜
⎝ 1.25 V
⎠
Therefore use a 30.1kΩ standard 1% value.
8. The switching frequency is set to 1.3MHz if jumper JP1 is shunted at the H position. To get
700KHz operation, shunt JP1 at the L position.
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-SEPIC-00A Rev. 1.0
www.MonolithicPower.com
6/15/2005
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
4
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