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 FEATURES 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. • • • • • • • Up to 3A Output Current Wide 4.75 to 28V Operating Input Range Monolithic Buck with 100mΩ Internal FET Fixed 385KHz Frequency All Ceramic Input and Output Capacitors Programmable Soft-Start Programmable Input Under-Voltage Lockout APPLICATIONS • • • Distributed Power Systems Battery Charger Pre-Regulator for Linear Regulators , “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 Value Units VIN VOUT IOUT 4.75 – 28 3.3 0–3 V V A EV1593DN-00A EVALUATION BOARD Efficiency vs Load Current 100 VIN = 9V 95 EFFICIENCY (%) 90 85 VIN = 24V 80 VIN = 12V 75 70 65 60 55 50 (2.1”X x 1.3”Y x 0.4”Z) 0 Board Number MPS IC Number EV1593DN-00A MP1593 08/04, Rev. 1.0 www.MonolithicPower.com 500 1000 1500 2000 2500 3000 3500 LOAD CURRENT (mA) EV1593_TAC _EC01 1 EV1593DN-00A – 4.75V-28V INPUT, UP TO 3A OUTPUT STEP-DOWN CONVERTER EVALUATION BOARD - INITIAL RELEASE EVALUATION BOARD SCHEMATIC EN C7 OPEN SS R4 OPEN C1 22nF 1 2 VIN 3 GND 4 MP1593 BS SS IN EN SW COMP GND FB R5 OPEN 8 7 6 5 C3 8.2nF C4 OPEN VOUT SW D1 B340A GND EV1593_S01 EV1593DN-00A BILL OF MATERIALS Qty Ref 1 2 1 0 2 1 1 0 1 1 1 1 0 0 C1 C2, C8 C3 C4, C7 C5, C9 C6 L1 D1 U1 R1 R2 R3 R4 R5 08/04, Rev. 1.0 Description Package Ceramic Capacitor, 22nF, 50V, X7R Ceramic Capacitor, 10µF, 50V, Y5V Ceramic Capacitor, 8.2nF, 50V, X7R Open Ceramic Capacitor, 22µF, 16V, X5R Ceramic Capacitor, 0.1µF, 50V, X7R Inductor, 10µH, 4A Schottky Diode, 40V, 3A 28V, 3A, Step Down Converter Resistor, 16.9kΩ, 1% Resistor, 5.6kΩ, 5% Resistor, 10kΩ, 1% Open Open Manufacturer Part Number 0805 1210 0603 Any Murata Any 1210 0805 Taiyo Yuden Any Sumida Diodes Inc. MPS Any Any Any SMA SOIC8 0603 0603 0603 www.MonolithicPower.com GRM32DF51H106ZA01L EMK3Z5BJ226MM CDRH8D43-100NC B340A MP1593DN 2 EV1593DN-00A – 4.75V-28V INPUT, UP TO 3A OUTPUT STEP-DOWN CONVERTER EVALUATION BOARD - INITIAL RELEASE TYPICAL PERFORMANCE CHARACTERISTICS Load Transient Waveforms Turn Off Waveforms VOUT 100mV/Div. 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 100mV/Div. IL 1A/Div. VSW 10V/Div. 4ms/Div. EV1593-WF03 EV1593-WF04 Efficiency vs Load Current Efficiency vs Load Current 100 100 VIN = 5V 95 90 EFFICIENCY (%) 90 EFFICIENCY (%) VIN = 9V 95 85 VIN = 24V 80 VIN = 12V 75 70 65 85 VIN = 12V 75 70 65 60 60 55 55 50 VIN = 24V 80 50 0 500 1000 1500 2000 2500 3000 3500 0 LOAD CURRENT (mA) LOAD CURRENT (mA) EV1593_TPC05 08/04, Rev. 1.0 500 1000 1500 2000 2500 3000 3500 www.MonolithicPower.com EV1593_TPC06 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 + ⎟ × 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 in the MP1593 datasheet. Table 1—Recommended Components for Standard Output Voltages VOUT 1.8V 2.5V 3.3V 5V 12V R1 4.75kΩ 10.5kΩ 16.9kΩ 30.9kΩ 88.7kΩ R2 3kΩ 3.9kΩ 5.6kΩ 7.5kΩ 10kΩ C3 4.7nF 5.6nF 8.2nF 10nF 3.3nF L1 4.7µH 4.7-6.8µH 6.8-10µH 10-15µH 15-22µH 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 © 2004 MPS, Inc. Tel: 408-357-6600 ♦ Fax: 408-357-6601 ♦ www.MonolithicPower.com 5