TM EV2364DF-01A 1.5A, 23V, 1.4MHz Dual Step-Down Converter Evaluation Board The Future of Analog IC Technology TM DESCRIPTION FEATURES The EV2364DF-01A is an evaluation board for the MP2364, a dual output, monolithic step-down switch mode converter with built-in internal power MOSFETs. It achieves 1.5A continuous output current for each output over a wide input supply range with excellent load and line regulation. • • • • • The MP2364’s current mode operation provides fast transient response and eases loop stabilization. • • • • • Its fault protection includes cycle-by-cycle current limiting and thermal shutdown. In shutdown mode the regulator draws 40µA of supply current. 1.5A Current for Each Output Ceramic Input and Output Capacitors Up to 90% Efficiency Fixed 1.4MHz Frequency Wide 4.75V to 23V Operating Input Range APPLICATIONS Distributed Power Systems I/O and Core Supplies DSL Modems Set Top Boxes Cable Modems “MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic Power Systems, Inc. ELECTRICAL SPECIFICATIONS Parameter Input Voltage Output Voltage A Output Voltage B Symbol Value Units VIN VOUTA VOUTB 4.75 to 23 3.3 2.5 V V V EV2364DF-01A EVALUATION BOARD Efficiency vs Load Current 100 VOUT=3.3V EFFICIENCY (%) 90 80 VOUT=5V VOUT=2.5V 70 60 (L x W x H) 2.2” x 1.6” x 0.4” (5.5cm x 4.1cm x 1.0cm) Board Number MPS IC Number EV2364DF-01A MP2364DF EV2364DF-01A Rev. 1.1 3/1/2006 50 0 0.5 1.0 LOAD CURRENT (A) www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. 1.5 MP2364_EC01 1 TM EV2364DF-01A – 1.5A, 23V, 1.4MHz DUAL STEP-DOWN CONVERTER EV BOARD EVALUATION BOARD SCHEMATIC VIN 4.75V to 23V GND D1 NS OPTIONAL 5V INPUT ONLY U1 C2 10nF VOUTA 3.3V @ 1.5A SSA ENA NC1 COMPA BSA FBA INA SGB SWA D2 B230A-13 C4 NS GND C8 2.2nF ENA C5 3.3nF PGA MP2364 SGA D4 NS OPTIONAL 5V INPUT ONLY C13 82pF PGB SWB INB FBB NC2 COMPB BSB ENB SSB C7 10nF D3 B230A-13 C10 NS VOUTB 2.5V @ 1.5A GND ENB EV2364_S01 EV2364DF-01A BILL OF MATERIALS Qty Ref 2 C1, C6 2 C2, C7 10nF Ceramic Capacitor, 50V, X7R 0603 2 C3, C9 22µF Ceramic Capacitor, 6.3V, X5R 1210 2 C4, C10 1 C5 3.3nF Ceramic Capacitor, 50V, X7R 0603 1 C8 2.2nF Ceramic Capacitor, 50V, X7R 0603 2 C11, C12 10µF Ceramic Capacitor, 25V, X7R 1210 1 C13 82pF Ceramic Capacitor, 50V, NPO 0603 2 D1, D4 Do Not Stuff 2 D2, D3 Schottky Diode, 30V, 2A, SMA 2 L1, L2 Inductor, 5uH, 2.4A, SMD 1 1 3 1 1 Value Description 0.47µF Ceramic Capacitor, 16V, X7R Distributor P/N TDK: C2012X7R1C474K TDK: C1608X7R1H103K TDK: C3225X5R0J226M Digikey: 445-1357-1-ND Digikey: 445-1311-1-ND Digikey: 445-1404-1-ND Panasonic: ECJ-1VB1H332K TDK: C1608X7R1H222K TDK: C3225X7R1E106M TDK: C1608C0G1H820J Digikey: PCC1778CT-ND Digikey: 445-1309-1-ND Digikey: 445-1434-1-ND Digikey: 445-1280-1-ND Diodes Inc: B230A-13 Sumida: CDRH6D28-5R0NC Any Any Any Any MPS: MP2364DF Digikey: B230ADICT-ND 0805 Do Not Stuff R1 25.5kΩ Resistor, 1% R2 7.5kΩ Resistor, 5% R3, R5, R6 10kΩ Resistor, 1% R4 16.9kΩ Resistor, 1% U1 DC/DC Converter, TSSOP20 EV2364DF-01A Rev. 1.1 3/1/2006 Package Manufacturer P/N 0603 0603 0603 0603 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. Any Any Any Any 2 TM EV2364DF-01A – 1.5A, 23V, 1.4MHz DUAL STEP-DOWN CONVERTER EV BOARD PRINTED CIRCUIT BOARD LAYOUT Figure 1—Top Silk Layer Figure 2—Top Layer Figure 3—Bottom Layer EV2364DF-01A Rev. 1.1 3/1/2006 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. 3 TM EV2364DF-01A – 1.5A, 23V, 1.4MHz DUAL STEP-DOWN CONVERTER EV BOARD QUICK START GUIDE The output voltages of this board are set to 3.3V (VOUTA) and 2.5V (VOUTB). The board layout accommodates most commonly used inductors and output capacitors. 1. Attach the positive and negative ends of the first load to the VOUTA and GND pins, respectively. If using both outputs, attach the positive and negative ends of the second load to the VOUTB and GND pins, respectively. 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 of the power supply output to the GND pin. 4. Turn the power supply on. The MP2364 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 and less than 0.7V to turn it off. 6. The output voltages VOUTA and VOUTB can be changed by varying R1 and R4, respectively. Calculate the new values by the following formulae: ⎞ ⎛V R1 = R6 × ⎜⎜ OUTA − 1⎟⎟ ⎠ ⎝ 0.92 ⎞ ⎛V R4 = R3 × ⎜⎜ OUTB − 1⎟⎟ 0 . 92 ⎠ ⎝ Where R6 = 10kΩ and R3 = 10kΩ Example: For VOUTA = 3.3V: R1 = 10kΩ × ( 3. 3 − 1) = 25.9kΩ 0.92 Therefore, use a 25.5kΩ standard 1% value resistor. 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. EV2364DF-01A Rev. 1.1 3/1/2006 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. 4