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| EV2354DS-00A 4.75V to 23V IN, 2A OUT, 380KHz Step-Down DC/DC Converter Monolithic Power Systems EVALUATION BOARD GENERAL DESCRIPTION The EV2354DS-00A is the Evaluation Board for MPS' MP2354 Step-Down DC/DC Converter. It features a wide supply range of 4.75V to 23V and a continuous output current up to 2A. The output voltage is preset to 3.3V, but can be easily adjusted to other levels from 1.22V. A 380KHz high switching frequency allows the use of small, low cost capacitors and inductors. Current mode control and an integrated power MOSFET minimize component count, board area, and solution cost. Fault condition protection includes cycle-by-cycle current limiting, thermal shutdown, and under-voltage lockout. Internal soft-start reduces the turn-on stress. The small but thermally enhanced 8-pin SOIC package minimizes board area and provides excellent thermal management. FEATURES * * * * * * * * * * Up to 2A Continuous Output Current Wide 4.75V to 23V Operating Input Range Monolithic Buck with 180m Internal FET Fixed 380KHz Frequency All Ceramic Input and Output Capacitors Programmable Soft-Start Programmable Input Under-Voltage Lockout Distributed Power Systems Battery Chargers Pre-Regulator for Linear Regulators APPLICATIONS "MPS" and "Monolithic Power Systems", are Registered Trademarks of Monolithic Power Systems, Inc. ELECTRICAL SPECIFICATION Parameter Supply Voltage Output Voltage Output Current Symbol VIN VOUT IOUT Value 4.75 to 23 3.3 0 to 2 Units V V A EV2354DS-00A EVALUATION BOARD Efficiency vs Output Current 95 90 5.0V 3.3V 2.5V EFFICIENCY (%) 85 80 75 70 65 60 0 0.5 1.0 1.5 Dimensions (2.6"X x 1.9"Y x 0.4"Z) Board Number EV2354DS-00A EV2354DS-00A Rev. 1.0 1/26/2005 2.0 2.5 OUTPUT CURRENT (A) MP2354_TAC_EC01 MPS IC Number MP2354 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 1 EV2354DS-00A - 4.75V TO 23V IN, 2A OUT, 380KHz STEP-DOWN CONVERTER EVALUATION BOARD EVALUATION BOARD SCHEMATIC VIN C6 OPEN EN R1 OPEN SYNC C3 OPEN COMP R3 OPEN C11 OPEN VIN EN BS SW C4 10nF D1 B230A SYNC C1 OPEN VOUT C9 OPEN MP2354 FB C10 OPEN GND C2 OPEN C5 3.3nF EV2354_S01 EV2354DS-00A BILL OF MATERIALS Qty 7 1 1 1 1 1 1 2 1 1 1 Ref C1, C2, C3, C6, C9, C10, C11 C4 C5 C7 C8 D1 L1 R1, R3 R2 R4 R5 7.5k 16.9k 10k 15H Value Description Do Not Stuff 10nF 3.3nF 10F 22F Ceramic Cap, 50V, X7R Ceramic Cap, 50V, X7R Ceramic Cap, 25V, X5R Ceramic Cap, 16V, X5R Schottky Diode, 30V, 2A Inductor, 2.9A Do Not Stuff Film Res, 5% Film Res, 1% Film Res, 1% SM0805 SM0805 SM0805 Panasonic Panasonic Panasonic ERJ-6GEYJ752V ERJ-6ENF1692V ERJ-6ENF1002V SM0805 SM0805 SM1210 SM1210 SMA SMD AVX AVX AVX AVX Diodes Inc Sumida 08055C103KAT2A 08055C332KAT2A 12103D106KAT2A 1210YD226KAT2A B230A-13 CDRH8D43-150 Package Manufacturer Manufacturer P/N EV2354DS-00A Rev. 1.0 1/26/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 2 EV2354DS-00A - 4.75V TO 23V IN, 2A OUT, 380KHz STEP-DOWN CONVERTER EVALUATION BOARD PRINTED CIRCUIT BOARD LAYOUT Figure 1--Top Silk Layer Figure 2--Top Layer Figure 3-- Bottom Silk Layer Figure 4--Bottom Layer EV2354DS-00A Rev. 1.0 1/26/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 3 EV2354DS-00A - 4.75V TO 23V IN, 2A OUT, 380KHz STEP-DOWN CONVERTER EVALUATION BOARD QUICK START GUIDE 1. Connect the positive terminal of the load to VOUT pins, and the negative terminal of the load to GND pins 2. Preset the power supply output to 4.75V to 23V and turn off the power supply. 3. Connect the positive terminal of the power supply output to the VIN pin and the negative terminal of the power supply output to the GND pin 4. Turn the power supply on. The MP2354 will automatically start. 5. To use the Enable function, apply a digital input to EN pin. Drive EN higher than 2.5V to turn on the regulator, drive EN less than 0.7V to turn it off. 6. An input under voltage lockout (UVLO) function can be implemented with the addition of a resistor divider R4 and R5. R4 The EN threshold is 2.5V, so VIN UVLO threshold is 1 + x 2 .5 V R5 The output voltage of this board is preset to 3.3V. This board is laid out to accommodate most commonly used inductors and output capacitors and to be programmed for most standard output voltages. For other output voltages, please refer to the Application Information section in the MP2354 datasheet. 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. EV2354DS-00A Rev. 1.0 1/26/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 4 |
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