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| TM EV2307DN-00A 3A, 23V, 340KHz Synchronous Step-Down Converter EVALUATION BOARD - INITIAL RELEASE The Future of Analog IC Technology TM GENERAL DESCRIPTION The MP2307 is a monolithic synchronous buck regulator. The device integrates 100m MOSFETS that provide 3A continuous load current over a wide operating input voltage range of 4.75V to 23V. Current mode control provides fast transient response and cycle-bycycle current limit. An adjustable soft-start prevents inrush current at turn-on. In shutdown mode, the supply current drops to only 1A. This device, available in an 8-pin SOIC package, provides a very compact system solution with minimal reliance on external components. FEATURES * * * * * * * * * * * * Up to 3A Output Current Wide 4.75V to 23V Operating Input Range Monolithic Synchronous Buck with 100m High-Side and Low-Side FETs Fixed 340KHz Frequency All Ceramic Input and Output Capacitors Programmable Soft-Start Programmable Input Under Voltage Lockout Distributed Power Systems Networking Systems FPGA, DSP, ASIC Power Supplies Green Electronics/ Appliances Notebook Computers APPLICATIONS ELECTRICAL SPECIFICATIONS Parameter Supply Voltage Output Voltage Output Current Symbol VIN VOUT IOUT Value 4.75 to 23 3.3 0 to 3 Units V V A "MPS" and "The Future of Analog IC Technology" are Trademarks of Monolithic Power Systems, Inc. EV2307DN-00A EVALUATION BOARD Efficiency vs Load Current 100 95 90 EFFICIENCY (%) VIN = 5V VIN = 12V VIN = 23V 85 80 75 70 65 60 55 50 0.1 ((L x W x H) 2.0" x 1.5" x 0.5" (5.0cm x 3.8cm x 1.2cm) Board Number EV2307DN-00A MPS IC Number MP2307DN 1.0 LOAD CURRENT (A) 10 MP2307_EC01 EV2307DN-00A Rev. 1.1f 9/14/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 1 TM EV2307DN-00A - 3A, 23V, 340KHz SYNCHRONOUS STEP-DOWN CONVERTER EVALUATION BOARD - INITIAL RELEASE EVALUATION BOARD SCHEMATIC EN SS C7 NS R5 NS C1 10nF U1 1 BS SS 8 VIN GND 2 IN EN 7 MP2307 3 SW COMP 6 4 GND FB 5 C3 3.3nF C4 NS VOUT 3.3V / 3A D1 B130LAW-7 (optional) GND EV2307_S01 EV2307DN-00A BILL OF MATERIALS Qty 1 2 1 2 2 1 1 1 1 1 1 1 1 1 Ref C1 C2, C8 C3 C4, C7 C5, C9 C6 D1 L1 R1 R2 R3 R4 R5 U1 10H 26.1k 5.6k 10k 100k NS Value 10nF 10F 3.3nF NS 22F 0.1F Description Ceramic Cap, 50V, X7R Ceramic Cap, 25V, X7R Ceramic Cap, 50V, X7R Not Stuffed Ceramic Cap, 16V, X5R Ceramic Cap, 50V, X7R Diode Schottky, 30V, 1A Inductor, 4A Resistor, 1% Resistor, 5% Resistor, 1% Resistor Not Stuffed Step-Down Converter SO8 MPS MP2307DN SM1210 SM0805 SMD SM0805 SM0805 SM0805 SM0805 TDK TDK Sumida Any Any Any Any C3225X5R1C226M C2012X7R1H104K B130LAW-7 CDR8D43 Package Manufacturer SM0805 SM1210 SM0805 TDK TDK Panasonic Manufacturer P/N C2012X7R1H103K C3225X7R1E106M ECJ-2VB1H332K SOD-123 Diodes Inc EV2307DN-00A Rev. 1.1f 9/14/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 2 TM EV2307DN-00A - 3A, 23V, 340KHz SYNCHRONOUS STEP-DOWN CONVERTER EVALUATION BOARD - INITIAL RELEASE PRINTED CIRCUIT BOARD LAYOUT Figure 1--Top Silk Layer Figure 2--Top Layer Figure 3--Bottom Layer EV2307DN-00A Rev. 1.1f 9/14/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 3 TM EV2307DN-00A - 3A, 23V, 340KHz SYNCHRONOUS STEP-DOWN CONVERTER EVALUATION BOARD - INITIAL RELEASE QUICK START GUIDE 1. Connect the positive terminal of the load to the VOUT pins and the negative terminal to the GND pins. 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 to the GND pin. 4. Turn on the power supply. The MP2307 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 or less than 0.7V to turn it off. 6. An 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 the VIN UVLO threshold is: 1 + R4 x 2.5 V . R5 RECOMMENDED COMPONENTS FOR STANDARD OUTPUT VOLTAGES The output voltage of this board is set to 3.3V. This board is laid out to accommodate most commonly used inductors and output capacitors and to also be programmed for most standard output voltages. The following table lists recommended components for some standard output voltages. Listed compensation components (R2, C3) values are based on the output capacitor installed on this board. For other capacitors, refer to the Application Information section of the MP2307 datasheet. VOUT 1.8V 2.5V 3.3V 5V 12V R1 9.53k 16.9k 26.1k 44.2 121k R2 4.42k 4.75k 5.6k 7.5k 10k C3 6.8nF 4.7nF 3.3nF 3.3nF 1.2nF L1 4.7H 4.7H to 6.8H 6.8H to 10H 10H to 15H 15H to 22H 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. EV2307DN-00A Rev. 1.1f 9/14/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 4 |
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