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| EV1570DN-00A 3A, 23V, 340KHz Synchronous Step-Down Converter The Future of Analog IC Technology EVALUATION BOARD - INITIAL RELEASE GENERAL DESCRIPTION The EV1570DN-00A is the evaluation board of MPS' MP1570 synchronous buck converter. It has a wide supply range from 4.75V to 23V and a continuous output current up to 3A. It features synchronous rectification for high efficiency with integrated high-side and low-side power MOSFETs. The output voltage is set to 3.3V, but can be easily adjusted to other levels from 1.22V. Current mode control and integrated power MOSFETs minimize component counts, board area, and solution cost. Fault condition protections include cycle-by-cycle current limiting, thermal shutdown, over voltage protection and under voltage lockout. Internal soft-start reduces turn-on stress. Small but thermally enhanced SO-8 package minimizes board area with excellent thermal management. 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 Pre-Regulator for Linear Regulators Notebook Computers APPLICATIONS "MPS" and "The Future of Analog IC Technology" are Registered Trademarks of Monolithic Power Systems, Inc. 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 EV1570DN-00A EVALUATION BOARD Efficiency vs Load Current 100 95 90 EFFICIENCY (%) VIN = 5V 85 80 75 70 65 60 VIN = 23V 55 50 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 LOAD CURRENT (A) MP1570-EC01 VIN = 12V (2"X x 1.5"Y x 0.5"Z) Board Number EV1570DN-00A MPS IC Number MP1570 EV1570DN-00A Rev. 1.1 4/6/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 1 EV1570DN-00A - 3A, 23V, 340KHz SYNCHRONOUS STEP-DOWN CONVERTER EVALUATION BOARD - INITIAL RELEASE EVALUATION BOARD SCHEMATIC EN C7 OPEN SS R5 OPEN C1 10nF 1 U1 BS SS 8 VIN GND 2 IN EN 7 MP1570 3 SW COMP 6 4 GND FB 5 C3 3.3nF C4 OPEN TP6 TP7 VOUT SW TP8 D1 OPEN TP9 GND EV1570DN-00A_S01 EV1570DN-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 Value 10nF 10F 3.3nF Description Package 0603 1210 0603 1210 0805 Manufacturer Any Taiyo Yuden Any Taiyo Yuden Any Sumida Any Any Any Any MPS Part Number TMK325BJ106MM Ceramic Capacitor, 50V, X7R Ceramic Capacitor, 25V, X5R Ceramic Capacitor, 50V, X7R Open 22F Ceramic Capacitor, 16V, X5R 0.1F Ceramic Capacitor, 50V, X7R Open 10H Inductor, 4A 16.9k Resistor, 1% 5.6k Resistor, 5% 10k Resistor, 1% 100k Resistor, 5% Open Synchronous Buck Converter EMK325BJ226MM CDRH8D43-100NC 0603 0603 0603 0603 SO8 MP1570DN 2 EV1570DN-00A Rev. 1.1 4/6/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. EV1570DN-00A - 3A, 23V, 340KHz SYNCHRONOUS STEP-DOWN CONVERTER EVALUATION BOARD - INITIAL RELEASE TYPICAL PERFORMANCE CHARACTERISTICS VIN = 12V, VOUT = 3.3V, RLOAD = 2, unless otherwise noted. Load Transient Waveforms 1A - 2A STEP VOUT 50mV/div. VOUT 1V/div. IL 1A/div. Turn Off Waveforms IL 1A/div. MP1570-WF01 MP1570-WF02 Soft-Start Waveforms IL 1A/div. VOUT 1V/div. VOUT 10mV/div. VIN 100mV/div. VSW 10V/div. 4ms/div. MP1570-WF03 Switching Waveforms IL 1A/div. MP1570-WF04 EV1570DN-00A Rev. 1.1 4/6/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 3 EV1570DN-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 EV1570DN-00A Rev. 1.1 4/6/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 4 EV1570DN-00A - 3A, 23V, 340KHz SYNCHRONOUS STEP-DOWN CONVERTER EVALUATION BOARD - INITIAL RELEASE QUICK START GUIDE 1. Connect the positive terminal of the load to VOUT pins, and the negative terminal of the load to GND pins. 2. Preset 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 VIN pin, and the negative terminal of the power supply output to GND pin. 4. Turn power supply on and the MP1570 will automatically startup. 5. To use 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 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 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 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 MP1570 datasheet.. VOUT 1.8V 2.5V 3.3V 5V 12V R1 4.75k 10.5k 16.9k 30.9k 88.7k R2 5.6k 4.7k 5.6k 7.5k 10k C3 3.3nF 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. EV1570DN-00A Rev. 1.1 4/6/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 5 |
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