TM EV2361DK/DQ-00A 2A, 1.4MHz Step-Down Converter Evaluation Board The Future of Analog IC Technology TM DESCRIPTION FEATURES The EV2361DK/DQ-00A is the evaluation board for the MP2361, a monolithic step down switch mode converter with a built in internal power MOSFET. The MP2361 achieves 2A continuous output current over a wide input supply range with excellent load and line regulation. • • • • • • • • • Current mode operation provides fast transient response and eases loop stabilization. 2A Output Current with QFN Package Up to 90% Efficiency 20µA Shutdown Mode Fixed 1.4MHz Frequency Thermal Shutdown Cycle-by-Cycle Over Current Protection Wide 4.75V to 23V Operating Input Range Output Adjustable from 0.92V to 16V Programmable Under Voltage Lockout Fault condition protection includes cycle-by-cycle current limiting and thermal shutdown. In shutdown mode the regulator draws 20µA of supply current. Programmable soft-start minimizes the inrush supply current and the output overshoot at initial startup. APPLICATIONS The MP2361 requires a minimum number of readily available standard external components. “MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic Power Systems, Inc. • • • • Distributed Power Systems Set Top Boxes DSL Modems Pre-Regulator for Linear Regulators ELECTRICAL SPECIFICATIONS Parameter Input Voltage Output Voltage Output Current (1) Symbol Value Units VIN VOUT IOUT 4.75 to 23 3.3 2 V V A Note: 1) The maximum output current may be less than 2A if VOUT>60% of VIN. EV2361DK/DQ-00A EVALUATION BOARD Efficiency vs Load Current 100 VOUT=5V EFFICIENCY (%) 90 80 VOUT=2.5V VOUT=3.3V 70 60 (L x W x H) 2.1” x 1.3” x 0.4” (5.3cm x 3.3cm x 1.0cm) Board Number MPS IC Number EV2361DK/DQ-00A MP2361DK/DQ 50 0 0.5 1.0 1.5 LOAD CURRENT (A) EV2361DK/DQ-00A Rev. 1.3f www.MonolithicPower.com 10/5/2005 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 2.0 MP2361-EC01 1 TM EV2361DK/DQ-00A – 2A, 1.4MHz STEP-DOWN CONVERTER EV BOARD EVALUATION BOARD SCHEMATIC U1 NC SS BS EN SS EN C7 OPEN C1 10nF NC COMP C3 1.5nF R5 OPEN C4 OPEN VOUT VIN IN FB C8 OPEN GND SW GND GND MP2361 D1 B230A-13 30V/2A EV2361DK/DQ-00A BILL OF MATERIALS Qty Ref Value 1 C1 10nF 1 C2 10µF 1 C3 1.5nF 3 C4, C7, C8 OPEN 1 C5 1 C6 1 D1 1 L1 1 R1 2 R2, R3 Description Ceramic Capacitor, 50V, X7R Ceramic Capacitor 25V, X7R Ceramic Capacitor 50V, X7R Ceramic Capacitor 16V, X5R Ceramic Capacitor 0.47µF 25V, X7R SM0805 TDK C2012X7R1H103K SM1210 TDK C3225X7R1E106M SM0805 Panasonic ECJ-2VB1H152K SM1210 TDK C3225X5R1C226M SM0805 TDK C2012X7R1E474K Schottky Diode, 30V, 2A SMA Diodes Inc B230A-13 Inductor, 2.4A SMD Sumida CDRH6D28-5R0NC 26.1kΩ Resistor, 1% 10kΩ Manufacturer P/N Do Not Stuff 22µF 5µH Package Manufacturer SM0805 Panasonic ERJ-6ENF2610V Resistor, 1% SM0805 Panasonic ERJ-6ENF1002V SM0805 Panasonic ERJ-6GEYJ104V QFN10/ MPS MSOP10 MP2361DQ/MP2361DK 1 R4 100kΩ Resistor, 5% 1 R5 OPEN 1 U1 Do Not Stuff Step-Down Converter EV2361DK/DQ-00A Rev. 1.3f www.MonolithicPower.com 10/5/2005 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 2 TM EV2361DK/DQ-00A – 2A, 1.4MHz STEP-DOWN CONVERTER EV 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 terminal of the load to the VOUT pins, and the negative terminal of the load to the 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 MP2361 will automatically startup. 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 by the addition of a resistor divider R4 and R5. ⎛ The EN threshold is 2.5V, so VIN UVLO threshold is: ⎜1 + ⎝ R4 ⎞ ⎟ × 2.5 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. EV2361DK/DQ-00A Rev. 1.3f www.MonolithicPower.com 10/5/2005 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 3