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| EV1593DN-00A (MP1593) 4.75V to 28V Input, Up to 3A Output Step-Down DC/DC Converter Monolithic Power Systems EVALUATION BOARD - INITIAL RELEASE GENERAL DESCRIPTION The EV1593DN-00A is the Evaluation Board for MPS' MP1593 Step-Down DC/DC Converter. It features a wide supply range of 4.75V to 28V and a continuous output current up to 3A. The output voltage is set to 3.3V, but can be easily adjusted to other levels from 1.22V. A 385KHz high switching frequency allows the use of small, low cost capacitors and inductors. Current mode control and an integrated power MOSFET minimize component count, board area, and solution cost. Fault condition protection includes cycle-by-cycle current limiting, thermal shutdown, and under-voltage lockout. Internal soft-start reduces the turn-on stress. The small but thermally enhanced 8-pin SOIC package minimizes board area and provides excellent thermal management. FEATURES * * * * * * * * * * Up to 3A Output Current Wide 4.75 to 28V Operating Input Range Monolithic Buck with 100m Internal FET Fixed 385KHz Frequency All Ceramic Input and Output Capacitors Programmable Soft-Start Programmable Input Under-Voltage Lockout Distributed Power Systems Battery Charger Pre-Regulator for Linear Regulators APPLICATIONS , "MPS", "Monolithic Power Systems", and "The Future of Analog IC Technology" are Registered Trademarks of Monolithic Power Systems, Inc. ELECTRICAL SPECIFICATION Parameter Supply Voltage Output Voltage Output Current Symbol VIN VOUT IOUT Value 4.75 - 28 3.3 0-3 Units V V A EV1593DN-00A EVALUATION BOARD Efficiency vs Load Current 100 95 90 VIN = 9V VIN = 24V VIN = 12V EFFICIENCY (%) 85 80 75 70 65 60 55 50 0 (2.1"X x 1.3"Y x 0.4"Z) Board Number EV1593DN-00A MPS IC Number MP1593 500 1000 1500 2000 2500 3000 3500 LOAD CURRENT (mA) EV1593_TAC _EC01 08/04, Rev. 1.0 www.MonolithicPower.com 1 EV1593DN-00A - 4.75V-28V INPUT, UP TO 3A OUTPUT STEP-DOWN CONVERTER EVALUATION BOARD - INITIAL RELEASE EVALUATION BOARD SCHEMATIC EN SS R4 OPEN C1 22nF C7 OPEN R5 OPEN 1 2 3 4 MP1593 BS IN SS EN 8 7 6 5 VIN GND SW COMP GND FB C3 8.2nF C4 OPEN SW D1 B340A VOUT GND EV1593_S01 EV1593DN-00A BILL OF MATERIALS Qty 1 2 1 0 2 1 1 0 1 1 1 1 0 0 Ref C1 C2, C8 C3 C4, C7 C5, C9 C6 L1 D1 U1 R1 R2 R3 R4 R5 Description Ceramic Capacitor, 22nF, 50V, X7R Ceramic Capacitor, 10F, 50V, Y5V Ceramic Capacitor, 8.2nF, 50V, X7R Open Ceramic Capacitor, 22F, 16V, X5R Ceramic Capacitor, 0.1F, 50V, X7R Inductor, 10H, 4A Schottky Diode, 40V, 3A 28V, 3A, Step Down Converter Resistor, 16.9k, 1% Resistor, 5.6k, 5% Resistor, 10k, 1% Open Open Package 0805 1210 0603 1210 0805 SMA SOIC8 0603 0603 0603 Manufacturer Part Number Any Murata Any Taiyo Yuden Any Sumida Diodes Inc. MPS Any Any Any GRM32DF51H106ZA01L EMK3Z5BJ226MM CDRH8D43-100NC B340A MP1593DN 08/04, Rev. 1.0 www.MonolithicPower.com 2 EV1593DN-00A - 4.75V-28V INPUT, UP TO 3A OUTPUT STEP-DOWN CONVERTER EVALUATION BOARD - INITIAL RELEASE TYPICAL PERFORMANCE CHARACTERISTICS Load Transient Waveforms VOUT 100mV/Div. Turn Off Waveforms VOUT 1V/Div. IL 1A/Div. IL 1A/Div. VIN = 12V, VOUT = 3.3V, 1A - 2A STEP EV1593-WF01 EV1593-WF02 Soft-Start Waveforms Switching Waveforms IL 1A/Div. VOUT 1V/Div. VOUT 10mV/Div. VIN IL 1A/Div. 100mV/Div. VSW 10V/Div. 4ms/Div. EV1593-WF03 EV1593-WF04 Efficiency vs Load Current 100 95 90 100 Efficiency vs Load Current 95 90 VIN = 5V EFFICIENCY (%) VIN = 9V VIN = 24V VIN = 12V EFFICIENCY (%) 85 80 75 70 65 60 55 50 0 500 1000 1500 2000 2500 3000 3500 85 80 75 70 65 60 55 50 0 VIN = 24V VIN = 12V 500 1000 1500 2000 2500 3000 3500 LOAD CURRENT (mA) EV1593_TPC05 LOAD CURRENT (mA) EV1593_TPC06 08/04, Rev. 1.0 www.MonolithicPower.com 3 EV1593DN-00A - 4.75V-28V INPUT, UP TO 3A OUTPUT STEP-DOWN CONVERTER EVALUATION BOARD - INITIAL RELEASE PRINTED CIRCUIT BOARD LAYOUT Figure 1--Top Silk Layer Figure 2--Top Layer Figure 3-- Bottom Layer 08/04, Rev. 1.0 www.MonolithicPower.com 4 EV1593DN-00A - 4.75V-28V INPUT, UP TO 3A OUTPUT 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 the power supply output to 4.75V - 28V 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 MP1593 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. R4 The EN threshold is 2.5V, so VIN UVLO threshold is 1 + 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. VOUT 1.8V 2.5V 3.3V 5V 12V R1 4.75k 10.5k 16.9k 30.9k 88.7k R2 3k 3.9k 5.6k 7.5k 10k 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 in the MP1593 datasheet. Table 1--Recommended Components for Standard Output Voltages C3 4.7nF 5.6nF 8.2nF 10nF 3.3nF L1 4.7H 4.7-6.8H 6.8-10H 10-15H 15-22H NOTICE: MPS believes the information in this document to be accurate and reliable. However, it is subject to change without notice. Contact MPS for current specifications. MPS encourages users of its products to ensure that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS cannot assume any legal responsibility for any said applications. EV1593DN-00A (MP1593) Rev. 1.0 Monolithic Power Systems, Inc. 8/4/04 983 University Avenue, Building A, Los Gatos, CA 95032 USA (c) 2004 MPS, Inc. Tel: 408-357-6600 Fax: 408-357-6601 www.MonolithicPower.com 5 |
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