TM EV2305DS-00A 4.75V to 23V IN, 2A OUT Synchronous Buck Converter The Future of Analog IC Technology TM EVALUATION BOARD DESCRIPTION FEATURES The EV2305DS-00A is the evaluation board of MPS’ MP2305 synchronous buck converter. It has a wide supply range from 4.75V to 23V and a continuous output current up to 2A. It features synchronous rectification for high efficiency with integrated high-side and low-side power MOSFETs. The output voltage is preset to 3.3V, but can be easily adjusted to other levels from 0.923V. Current mode control and integrated power MOSFETs minimize component counts, board area, and solution cost. Fault condition protections include cycle-by-cycle current limiting, thermal shutdown and under-voltage lockout. Programmable soft-start reduces turn-on stress. Small SO-8 package minimizes board area. • • • ELECTRICAL SPECIFICATIONS Parameter Symbol Value Units Supply Voltage VIN 4.75 to 23 V Output Voltage VOUT 3.3 V Output Current IOUT 0 to 2 A • • • • Up to 2A Output Current Wide 4.75V to 23V Operating Input Range Monolithic Synchronous Buck with 130mΩ High-Side and Low-Side FETs Fixed 340KHz Frequency All Ceramic Input and Output Capacitors Programmable Soft-Start Programmable Input Under Voltage Lockout APPLICATIONS • • • • • Distributed Power Systems Networking Systems FPGA, DSP, ASIC Power Supplies Green Electronics/ Appliances Notebook Computers “MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic Power Systems, Inc. EV2305DS-00A EVALUATION BOARD Efficiency vs Load Current 100 VOUT = 3.3V 95 EFFICIENCY (%) 90 85 VOUT = 2.5V 80 75 70 65 60 55 (L x W x H) 2.0” x 1.5” x 0.5” (5.0cm x 3.8cm x 1.2cm) 50 0 0.5 1.0 1.5 2.0 LOAD CURRENT (A) 2.5 MP2305-EC01 Board Number MPS IC Number EV2305DS-00A MP2305DS EV2305DS-00A Rev. 1.5f 9/14/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 1 TM EV2305DS-00A – 4.75V TO 23V IN, 2A OUT SYNCHRONOUS BUCK CONVERTER EVALUATION BOARD EVALUATION BOARD SCHEMATIC SS EN 1 BS SS 8 C1 10nF C7 OPEN 2 VIN 4.75V to 23V C8 OPEN IN EN R5 OPEN 7 MP2305 3 COMP SW 6 C3 3.3nF 4 FB GND 5 C4 OPEN U1 SW D1 OPEN VOUT 3.3V/2A C5 OPEN EV2305_S01 EV2305DS-00A BILL OF MATERIALS Item Qty Ref Value Description Package Manufacturer Part Number 1 1 C1 10nF Ceramic Cap, 50V, X7R SM0805 AVX 08055C103KAT2A 2 1 C2 10µF Ceramic Cap, 25V, X5R SM1210 AVX 12103D106KAT2A 3 1 C3 3.3nF Ceramic Cap, 50V, X7R SM0805 AVX 08055C332KAT2A 4 4 OPEN Not Stuffed 0.1µF Ceramic Cap, 50V, X7R SM0805 AVX 08055C104KAT2A 22µF Ceramic Cap, 16V, X5R SM1210 AVX 1210YD226KAT2A 5 1 C4, C5 C7, C8 C6 6 1 C9 7 1 D1 8 1 L1 10µH Inductor, 2.5A SMD Sumida 9 1 R1 26.1kΩ Resistor, 1% SM0805 Panasonic ERJ-6ENF2612V 10 1 R2 5.6kΩ Resistor, 5% SM0805 Panasonic ERJ-6GEYJ562V 11 1 R3 10kΩ Resistor, 1% SM0805 Panasonic ERJ-6ENF1002V 12 1 R4 100kΩ Resistor, 5% SM0805 Panasonic ERJ-6GEYJ104V 13 1 R5 OPEN Not Stuffed SM0805 14 1 U1 EV2305DS-00A Rev. 1.5f 9/14/2005 Do Not Stuff DC-DC Converter SO8 MPS www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. CDRH8D28 MP2305DS 2 TM EV2305DS-00A – 4.75V TO 23V IN, 2A OUT SYNCHRONOUS BUCK CONVERTER EVALUATION BOARD PRINTED CIRCUIT BOARD LAYOUT Figure 1—Top Silk Layer Figure 2—Top Layer Figure 3—Bottom Layer QUICK START GUIDE 1. Connect the positive terminals of the load to the VOUT pins and the negative terminals to the GND pins. 2. Preset the power supply output to 4.75V to 23V and turn it off. 3. Connect the positive terminal of the power supply output to the VIN pin and the negative terminal to the GND pin 4. Turn on the power supply; the MP2305 will automatically startup. 5. To use the Enable function, apply a digital input to the EN pin. Drive EN higher than 2.5V to turn on the regulator or less than 0.7V to turn it off. 6. An under voltage lockout (UVLO) function can be implemented by the addition of a resistor ⎛ divider (R4 and R5). The EN threshold is 1.3V, so VIN UVLO threshold is: ⎜1 + ⎝ R4 ⎞ ⎟ × 1 .3 V . R5 ⎠ 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. EV2305DS-00A Rev. 1.5f 9/14/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 3