MP2361DQ

TM EV2361DK/DQ-00A 2A, 1.4MHz Step-Down Converter Evaluation Board The Future of Analog IC Technology TM DESCRIPTION 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. 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. The MP2361 requires a minimum number of readily available standard external components. FEATURES • • • • • • • • • • • • • 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 Distributed Power Systems Set Top Boxes 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 (1) Symbol VIN VOUT IOUT Value 4.75 to 23 3.3 2 Units 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 90 EFFICIENCY (%) VOUT=5V 80 VOUT=2.5V 70 60 VOUT=3.3V (L x W x H) 2.1” x 1.3” x 0.4” (5.3cm x 3.3cm x 1.0cm) Board Number EV2361DK/DQ-00A MPS IC Number MP2361DK/DQ 50 0 0.5 1.0 1.5 LOAD CURRENT (A) 2.0 MP2361-EC01 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. 1 TM EV2361DK/DQ-00A – 2A, 1.4MHz STEP-DOWN CONVERTER EV BOARD EVALUATION BOARD SCHEMATIC U1 NC SS SS BS EN EN C7 OPEN R5 OPEN C1 10nF NC COMP C3 1.5nF C4 OPEN VOUT VIN IN FB GND C8 OPEN SW GND GND MP2361 D1 B230A-13 30V/2A EV2361DK/DQ-00A BILL OF MATERIALS Qty 1 1 1 3 1 1 1 1 1 2 1 1 1 Ref C1 C2 C3 C4, C7, C8 C5 C6 D1 L1 R1 R2, R3 R4 R5 U1 5µH 10kΩ OPEN Value 10nF 10µF 1.5nF OPEN 22µF Description Ceramic Capacitor, 50V, X7R Ceramic Capacitor 25V, X7R Ceramic Capacitor 50V, X7R Do Not Stuff SM1210 TDK SM0805 TDK SMA SMD Diodes Inc Sumida C3225X5R1C226M C2012X7R1E474K B230A-13 CDRH6D28-5R0NC ERJ-6ENF2610V ERJ-6ENF1002V ERJ-6GEYJ104V Package Manufacturer SM0805 TDK SM1210 TDK SM0805 Panasonic Manufacturer P/N C2012X7R1H103K C3225X7R1E106M ECJ-2VB1H152K Ceramic Capacitor 16V, X5R Ceramic Capacitor 0.47µF 25V, X7R Schottky Diode, 30V, 2A Inductor, 2.4A Resistor, 1% Do Not Stuff Step-Down Converter 26.1kΩ Resistor, 1% 100kΩ Resistor, 5% SM0805 Panasonic SM0805 Panasonic SM0805 Panasonic QFN10/ MPS MSOP10 MP2361DQ/MP2361DK 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