MP2108DQ

TM EV2108DQ/DK-00A 2A, 6V, 720KHz Synchronous Buck Converter EVALUATION BOARD The Future of Analog IC Technology TM DESCRIPTION The EV2108DQ/DK-00A is the evaluation board for the MP2108, a 2A, 720KHz synchronous buck converter designed for low voltage applications requiring high efficiency. The MP2108 is capable of providing an output voltage as low as 0.9V and integrates top and bottom switches to minimize power loss and component count. The 720KHz switching frequency reduces the size of filtering components for a small solution size. The MP2108 includes cycle-by-cycle current limiting and under voltage lockout. The 10-pin MSOP package is available on the EV2108DK-00A while the 10-pin 3mm x 3mm QFN package is available on the EV2108DQ-00A. FEATURES • • • • • • • 2A Output Current Input Voltage Range of 2.6V to 6V Over 90% Efficiency SOHO Routers, PCMCIA Cards, Mini PCI Handheld Computers, PDAs Cell phones, Digital Still and Video Cameras Small LCD Displays APPLICATIONS “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. ELECTRICAL SPECIFICATIONS Parameter Input Voltage Output Voltage Output Current Symbol VIN VOUT IOUT Value 2.6 – 6 1.8 2 Units V V A EV2108DQ/DK-00A EVALUATION BOARD Dimensions (2.5”X x 2.0”Y x 0.5”Z) Board Number EV2108DQ/DK-00A MPS IC Number MP2108DQ/DK 1 EV2108DQ/DK-00A Rev. 1.0 www.MonolithicPower.com 3/2/2006 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. TM EV2108DQ/DK-00A – 2A, 6V, 720KHz SYNCHRONOUS BUCK CONVERTER EVALUATION BOARD EVALUATION BOARD SCHEMATIC VOUT D2 Opt. VIN VIN D3 Opt. C1 NS 10 C3 10nF GND 2 VIN RUN SS COMP VREF 9 U1 1 BST LX 3 EN R5 NS C6 NS VOUT D1 1N5819 C11 NS C9 NS 6 8 MP2108 FB SGND PGND 5 4 7 GND C10 10nF C4 NS C5 3.3nF C7 10nF EV2108_S01 EV2108DQ/DK-00A BILL OF MATERIALS Qty 5 1 3 1 1 1 2 1 1 1 2 1 1 Ref C1, C4, C6, C9, C11 C2 C3, C7, C10 C5 C8 D1 D2, D3 L1 R1 R2 R3, R4 R5 U1 Value NS 10µF 10nF 3.3nF 22µF Description Not Stuffed SM1210 SM0805 SM0805 SM1210 SOD123 SMD SM0805 SM0805 SM0805 TDK TDK Panasonic TDK Diodes Inc Sumida Panasonic Panasonic Panasonic C3225X5R1A106K C2012X7R1H103K ECJ-2VB1H332K C3225X5R0J226M 1N5819HW-7 CDRH6D26-5R0 ERJ-6GEYJ104V ERJ-6GEYJ682V ERJ-6ENF1002V MP2108DQ/DK Package Manufacturer Manufacturer P/N Ceramic Cap, 10V, X5R Ceramic Cap, 50V, X7R Ceramic Cap, 50V, X7R Ceramic Cap, 6.3V, X5R Schottky Diode, 40V, 1A Do Not Stuff 5µH Inductor, 2.2A 100kΩ Resistor, 5% 6.8kΩ Resistor, 5% 10kΩ Resistor, 1% NS Not Stuffed DC-DC Converter MSOP10/ MPS QFN10 EV2108DQ/DK-00A Rev. 1.0 www.MonolithicPower.com 3/2/2006 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. 2 TM EV2108DQ/DK-00A – 2A, 6V, 720KHz SYNCHRONOUS BUCK CONVERTER EVALUATION BOARD PRINTED CIRCUIT BOARD LAYOUT Figure 1—Top Silk Layer Figure 2—Top Layer Figure 3—Bottom Layer EV2108DQ/DK-00A Rev. 1.0 www.MonolithicPower.com 3/2/2006 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. 3 TM EV2108DQ/DK-00A – 2A, 6V, 720KHz SYNCHRONOUS BUCK CONVERTER EVALUATION BOARD QUICK START GUIDE The output voltage of this board is set to 1.8V. The board layout accommodates most commonly used inductors and output capacitors. 1. Attach the positive and negative ends of the load to the VOUT and GND pins, respectively. 2. Attach the input voltage (2.6V ≤ VIN ≤ 6V) and input ground to the IN and GND pins, respectively. 3. A pull-up resistor has connected the RUN pin to the VIN pin, so the MP2108 will startup automatically without applying an external voltage to the RUN pin. 4. The output voltage VOUT can be changed by varying R3. Calculate the new value using the formula: R3 = R4 × ( VOUT − 1) VFB where VFB = 0.9V and R4 = 10kΩ. For example, for VOUT = 2.5V: R3 = R4 × ( VOUT 2 .5 V − 1) = 10kΩ × ( − 1) = 17.78kΩ ~ 17.8kΩ VFB 0. 9 V for the closest standard 1% value. See Maximum Duty Cycle limits to determine allowable output voltages. The optional bootstrap diode (D3) may be added for improved efficiency. 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. EV2108DQ/DK-00A Rev. 1.0 www.MonolithicPower.com 3/2/2006 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. 4