TM EV2358DQ-00A 2A, 23V, 370KHz Step-Down Converter Evaluation Board The Future of Analog IC Technology TM DESCRIPTION FEATURES The EV2358DQ-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 23µA of supply current. The Programmable softstart minimizes the inrush supply current and the output overshoot at initial startup. • • 2A Output Current Stable with Low ESR Output Ceramic Capacitors Up to 95% Efficiency Wide 4.75V to 23V Operating Input Range APPLICATIONS • • • • Distributed Power Systems Battery Charger DSL Modems Pre-Regulator for Linear Regulators “MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic Power Systems, Inc. The MP2358 requires a minimum number of readily available standard external components. ELECTRICAL SPECIFICATIONS Parameter Input Voltage Output Voltage Output Current Symbol Value Units VIN VOUT IOUT 4.75 – 23 3.3 2 V V A EV2358DQ-00A EVALUATION BOARD Efficiency vs Output Current 95 EFFICIENCY (%) 90 (L x W x H) 2.0” x 1.3” x 0.4” (5.2cm x 3.3cm x 1.0cm) Board Number MPS IC Number EV2358DQ-00A MP2358DQ EV2358DQ-00A Rev. 1.1 1/9/2006 5.0V 3.3V 85 2.5V 80 75 70 65 60 0 0.5 1.0 1.5 2.0 2.5 OUTPUT CURRENT (A) www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. MP2358_EC01 1 TM EV2358DQ-00A – 2A, 23V, 370KHz STEP-DOWN CONVERTER EVALUATION BOARD EVALUATION BOARD SCHEMATIC VIN C7 10nF C1 NS GND U1 4 2 IN 9 EN R4 NS GND EN SW C3 NS 5 R7 NS C11 NS MP2358 10 R8 NS BS SS FB GND D1 B230A-13 VOUT 3.3V / 2A C9 NS GND 7 COMP 6 8 C6 NS C5 4.7nF EV2358DQ-00A BILL OF MATERIALS Qty 5 1 1 1 1 1 3 1 1 1 1 1 3 1 1 1 Ref C1, C3, C6, C9, C11 C2 C4 C5 C7 C8 C10, C12, C13 D1 L1 R1 R2 R3 R4, R7, R8 R5 R6 U1 EV2358DQ-00A Rev. 1.1 1/9/2006 Value Description Package Manufacturer Manufacturer P/N Not Stuffed 10µF 0.1µF 4.7nF 10nF 22µF Ceramic Capacitor, 25V, X7R Ceramic Capacitor, 16V, X7R Ceramic Capacitor, 50V, X7R Ceramic Capacitor, 50V, X7R Ceramic Capacitor, 16V, X5R 1210 0603 0603 0603 1210 TDK C3225X7R1E106M TDK C3225X5R1C226M 0.1µF Ceramic Capacitor, 50V, X7R 0805 TDK C2012X7R1H104K SMA SMD 0603 0603 0603 Diodes Inc. Sumida B230A-13 CDRH8D43-150NC MPS MP2358DQ Diode Schottky, 30V, 2A 15µH Inductor, 2.3A 25.5kΩ Resistor, 1% 10kΩ Resistor, 1% 100kΩ Resistor, 5% Do Not Stuff 7.5kΩ Resistor, 5% 0Ω Resistor, 5% Step-Down Converter 0603 0603 QFN10 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. 2 TM EV2358DQ-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 EV2358DQ-00A Rev. 1.1 1/9/2006 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. 3 TM EV2358DQ-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 × ( VOUT − 1) VFB Where VFB = 0.9V and R3 = 10kΩ. For example, for VOUT = 2.5V: R1 = R3 × ( VOUT 2 .5 V − 1) = 10kΩ × ( − 1) = 17.78kΩ ~ 17.8kΩ 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. EV2358DQ-00A Rev. 1.1 1/9/2006 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. 4