MPS EV8640DL-00A User manual

EV8640DL-00A
3A, 23V, 600KHz Step-Down Converter
with Sync Gate Driver EV Board
EV8640DL-00A Rev. 1.0 www.MonolithicPower.com 1
10/19/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2007 MPS. All Rights Reserved.
The Future of Analog IC Technology
DESCRIPTION
The EV8640DL-00A evaluation board is a fully
assembled and tested PCB that demonstrates the
performance of MP8640, a monolithic step-down
regulator.
The EVB generates a 3.3V output voltage at load
current up to 3A from a 4.5V to 23V input voltage
range, with excellent load and line regulation.
Current mode operation provides fast transient
response and eases loop stabilization.
Fault condition protection includes cycle-by-cycle
current limiting and thermal shutdown.
This device requires a minimum number of
readily available standard external components
and is available in a space saving 3mm x 4mm
14-pin QFN package.
ELECTRICAL SPECIFICATIONS
Parameter Symbol Value Units
Input Voltage VIN 4.5 – 23 V
Output Voltage VOUT 3.3 V
Output Current IOUT 3 A
FEATURES
•3A Continuous Output Current
•Wide 4.5V to 23V Operating Input Range
•Fixed 600KHz Frequency
•Synchronizable to >1MHz External Clock
•3.3V Rating Output Voltage
•Output Adjustable from 0.8V to 15V
•Stable with Low ESR Output Ceramic
Capacitors
•Fully Assembled and Tested
APPLICATIONS
•Point of Load Regulator in Distributed
Power System
•Digital Set Top Boxes
•Personal Video Recorders
•Broadband Communications
•Flat Panel Television and Monitors
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
EV8640DL-00A EVALUATION BOARD
(L x W x H) 2.9” x 2.9” x 0.5”
(7.5cm x 7.5cm x 1.2cm)
Board Number MPS IC Number
EV8640DL-00A MP8640DL

EV8640DL-00A – 3A, 23V, 600KHz STEP-DOWN WITH SYNCH GATE DRIVER EV BOARD
EV8640DL-00A Rev. 1.0 www.MonolithicPower.com 2
10/19/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2007 MPS. All Rights Reserved.
EVALUATION BOARD SCHEMATIC
IN
PG
EN/SYNC
VCC GND
14
7
4,5,6
2
3
12
11
8,9,10
13
1
BST
SW
BG
FB
MP8640DL
N/C
5,6,7,8
1,2,3
EV8640DL-00A BILL OF MATERIALS
Qty Ref Value Description Package Manufacturer Manufacturer P/N
1 R1 31.6kΩFilm Res., 1% 0603 Yageo RC0603FR-0731K6L
1 R2 10kΩFilm Res., 1% 0603 Yageo RC0603FR-0710KL
1 R3, R5 100kΩFilm Res., 5% 0603 Any
1 R4, R8 NS Not Stuffed
1 R6 10ΩFilm Res., 5% 0603 Any
1 R7, R9 0ΩFilm Res., 5% 0603 Any
2 C1A, C1B 10µF
Ceramic Cap, 25V,
X7R 1210 Murata GRM32DR71E106KA12
2 C2A, C2B 47µF
Ceramic Cap, 10V,
X5R 1210 Murata GRM32ER61A476KE20L
1 C3, C4 1µF
Ceramic Cap, 16V,
X7R 0603 Murata GRM188R71C105KA12D
1 C5 NS Not Stuffed
1 C6 0.1µF
Ceramic Cap, 50V,
X5R 0805 Murata GRM21BR71H104KA01L
1 C7 220pF
Ceramic Cap, 16V
X7R 0603 Murata
Si7112
Powerpa
k1212 Vishay Si7114
1 Q1 N-MOSFET
SO8 Analog Power AM4874
33mΩDCR 4.2A Toko DS84LC-B1015AS-3R9N
1 L1 3.9µH
70mΩDCR 4.2A SMD Wurth 7445303
1 U1
Step-Down
Converter QFN14 MPS MP8640DL

EV8640DL-00A – 3A, 23V, 600KHz STEP-DOWN WITH SYNCH GATE DRIVER EV BOARD
EV8640DL-00A Rev. 1.0 www.MonolithicPower.com 3
10/19/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2007 MPS. All Rights Reserved.
PRINTED CIRCUIT BOARD LAYOUT
Figure 1—Top Silk Layer Figure 2—Top Layer
Figure 3—Inner Layer 1 Figure 4—Inner Layer 2
Figure 5—Bottom Layer Figure 6—Bottom Silk Layer

EV8640DL-00A – 3A, 23V, 600KHz STEP-DOWN WITH SYNCH GATE DRIVER EV BOARD
NOTICE: The information in this document is subject to change without notice. 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.
EV8640DL-00A Rev. 1.0 www.MonolithicPower.com 4
10/19/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2007 MPS. All Rights Reserved.
QUICK START GUIDE
1. Connect the positive and negative terminals of the load to VOUT and GND pins, respectively.
2. Preset the power supply output to 4.5V – 23V and turn off the power supply.
3. Connect the positive and negative terminals of the power supply output to the VIN and GND
pins, respectively.
4. Turn the power supply on. The board will automatically startup.
5. To use the Enable function, apply a digital input to EN pin. Drive EN higher than1.2V to turn on
the regulator, drive EN less than 0.4V to turn it off.
6. Apply up to1.5MHz frequency logic level clock signal to the EN pin to synchronize the device to
an external clock. The duty cycle is not critical.