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| TM EV2358DS-00A 2A, 23V, 370KHz Step-Down Converter Evaluation Board The Future of Analog IC Technology TM DESCRIPTION The EV2358DS-00A is the evaluation board for the MP2358, a monolithic step-down switch mode converter with a built in internal power MOSFET. It achieves 2A continuous output current over a wide input supply range with excellent load and line regulation. The MP2358 employs current mode operation for fast transient response and loop stabilization. Its Fault condition protection includes cycle-by-cycle current limiting and thermal shutdown. In shutdown mode the regulator draws 23A of supply current. The Programmable softstart minimizes the inrush supply current and the output overshoot at initial startup. The MP2358 requires a minimum number of readily available standard external components. FEATURES * * * * * * * * 2A Output Current Stable with Low ESR Output Ceramic Capacitors Up to 95% Efficiency Wide 4.75V to 23V Operating Input Range Distributed Power Systems Battery Charger DSL Modems Pre-Regulator for Linear Regulators APPLICATIONS "MPS" and "The Future of Analog IC Technology" are Trademarks of Monolithic Power Systems, Inc. ELECTRICAL SPECIFICATIONS Parameter Input Voltage Output Voltage Output Current Symbol VIN VOUT IOUT Value 4.75 - 23 3.3 2 Units V V A EV2358DS-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 (L x W x H) 2.3" x 1.4" x 0.5" (cm x cm x cm) Board Number EV2358DS-00A EV2358DS-00A Rev. 1.2 1/9/2006 MPS IC Number MP2358DS 2.0 2.5 OUTPUT CURRENT (A) MP2358_EC01 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2006 MPS. All Rights Reserved. 1 TM EV2358DS-00A - 2A, 23V, 370KHz STEP-DOWN CONVERTER EVALUATION BOARD EVALUATION BOARD SCHEMATIC C1 10nF VIN GND C8 NS 2 IN 7 U1 1 BS SW 3 EN C7 NS R5 NS EN MP2358 8 SS GND 4 COMP 6 FB 5 D1 B230A-13 C5 NS VOUT 3.3V / 2A SS GND C3 4.7nF C4 NS EV2358_S01 EV2358DS-00A BILL OF MATERIALS Qty 1 1 1 4 1 1 1 1 1 1 1 1 1 1 Ref C1 C2 C3 C4, C5, C7, C8 C6 C9 D1 L1 R1 R2 R3 R4 R5 U1 Value 10nF 10F 4.7nF Description Ceramic Capacitor, 50V, X7R Ceramic Capacitor, 25V, X7R Ceramic Capacitor, 50V, X7R Not Stuffed Ceramic Capacitor, 16V, X7R Ceramic Capacitor, 16V, X5R Diode Schottky, 30V, 2A 15H Inductor, 2.3A 25.5k Resistor, 1% 7.5k Resistor, 5% 10k Resistor, 1% 100k Resistor, 5% Not Stuffed Step-Down Converter, 2A, 370KHz 0.1F 22F 0603 1210 SMA SMD 0603 0603 0603 0603 SO8 TDK Diodes Inc. Sumida C3225X5R1C226M B230A-13 CDRH8D43-150NC Package Manufacturer 0603 1210 0603 TDK Manufacturer P/N C3225X7R1E106M MPS MP2358DS EV2358DS-00A Rev. 1.2 1/9/2006 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2006 MPS. All Rights Reserved. 2 TM EV2358DS-00A - 2A, 23V, 370KHz STEP-DOWN CONVERTER EVALUATION BOARD PRINTED CIRCUIT BOARD LAYOUT Figure 1--Top Silk Layer Figure 2--Top Layer Figure 3--Bottom Layer EV2358DS-00A Rev. 1.2 1/9/2006 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2006 MPS. All Rights Reserved. 3 TM EV2358DS-00A - 2A, 23V, 370KHz STEP-DOWN CONVERTER EVALUATION BOARD QUICK START GUIDE The output voltage of this board is preset to 3.3V. The board is laid out to accommodate most commonly used inductors and output capacitors. 1. Connect the positive and negative ends of the load to the VOUT and GND pins, respectively. 2. Connect the input voltage (4.75V VIN 23V) and input ground to the VIN and GND pins, respectively. 3. To turn on the MP2358, apply an enable voltage VEN to the EN pin. Drive EN higher than 1V to turn on the MP2358 or lower than 0.4V to turn it off. 4. The output voltage VOUT can be programmed by varying R1. Calculate the new value using the formula: R1 = R3 x ( VOUT - 1) VFB Where VFB = 0.9V and R3 = 10k. For example, for VOUT = 2.5V: R1 = R3 x ( VOUT 2 .5 V - 1) = 10k x ( - 1) = 17.78k ~ 17.8k VFB 0. 9 V for the closest standard 1% value. 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. EV2358DS-00A Rev. 1.2 1/9/2006 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2006 MPS. All Rights Reserved. 4 |
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