Evaluates: MAX15053 19-5275 Rev 0 5/10 MAX15053 Evaluation Kit General Description Features The MAX15053 evaluation kit (EV kit) provides a proven S Operates from a 2.7V to 5.5V Input Supply design to evaluate the MAX15053 high-efficiency, 2A, S All-Ceramic Capacitor Design step-down regulator with integrated switches. The EV kit S 1MHz Switching Frequency is preset for 1.8V output at load currents up to 2A from S Output Voltage Range: 0.6V up to (0.94 x V ) a 2.7V to 5.5V input supply. The IC features a 1MHz IN fixed switching frequency, which allows the EV kit to S Enable Input/Power-Good Output achieve an all-ceramic capacitor design and fast tran- S Selectable Skip-Mode/Forced PWM Functionality sient responses. S Proven PCB Layout S Fully Assembled and Tested Ordering Information PART TYPE MAX15053EVKIT+ EV Kit +Denotes lead(Pb)-free and RoHS compliant. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION Not installed, ceramic 100pF Q10%, 6.3V X7R ceramic C1, C8 0 capacitors (1206) C9 1 capacitor (0603) TDK C1608X7R1H101K 22FF Q20%, 6.3V X5R ceramic JU1, JU3 2 3-pin headers capacitors (1206) C2, C7 2 Murata GRM31CR60J226K JU2 1 2-pin header TDK C3216X5R0J226M 1FH, 9A, 13.1mI inductor (5.2mm x 5.5mm x 3mm) 1000pF Q10%, 50V X7R L1 1 Vishay IHLP2020CZER1R0M11 ceramic capacitor (0603) C3 1 Vishay IHLP2020CZER1R0M01 TDK C1608X7R1H102K Murata GRM188R71H102K R1 1 8.06kI Q1% resistor (0603) R2 1 4.02kI Q1% resistor (0603) 22000pF Q10%, 50V X7R R3 1 2.32kI Q1% resistor (0603) ceramic capacitor (0603) C4 1 Murata GRM188R71H223K R4 1 20kI Q5% resistor (0603) TDK C1608X7R1H223K R5 1 1I Q1% resistor (0603) R6 1 1kI Q5% resistor (0603) Not installed, ceramic C5 0 capacitor (0603) 2A step-down regulator (9 WLP) U1 1 Maxim MAX15053EWL+ 3300pF Q10%, 50V X7R 3 Shunts ceramic capacitor (0603) C6 1 Murata GRM188R71H332K PCB MAX15053 EVALUATION 1 TDK C1608X7R1H332K KIT+ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.MAX15053 Evaluation Kit Component Suppliers SUPPLIER PHONE WEBSITE Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com TDK Corp. 847-803-6100 www.component.tdk.com Vishay 402-563-6866 www.vishay.com Note: Indicate that you are using the MAX15053 when contacting these component suppliers. Reference Input and Soft-Start (SS/REFIN) Quick Start The MAX15053 utilizes an adjustable soft-start function Recommended Equipment to limit inrush current during startup. The soft-start time is MAX15053 EV kit adjusted by the value of C4, the external capacitor from SS/REFIN to GND. By default, C4 is currently 22000pF, 5V, 2A DC power supply which gives a soft-start time of approximately 1.3ms. To Load capable of 2A adjust the soft-start time, determine C4 using the follow- Digital voltmeter ing formula: Procedure C4 = (10FA x t )/0.6V SS The EV kit is fully assembled and tested. Follow where t is the required soft-start time in seconds and SS the steps below to verify the board operation. C4 is in farads. C4 should be a minimum 1nF capacitor Caution: Do not turn on power supply until all between SS/REFIN and GND. connections are completed. When no external reference is applied at SS/REFIN, 1) Connect the positive terminal of the 5V supply to the the device uses the internal 0.6V reference. When an IN pad and the negative terminal to the nearest PGND external reference is used, soft-start needs to be pro- pad. vided externally. 2) Connect the positive terminal of the 2A load to the Setting the Output Voltage OUT pad and the negative terminal to the nearest The EV kit can be adjusted from 0.6V up to 0.94 x V IN PGND pad. by changing the values of resistors R1 and R2. To 3) Connect the digital voltmeter across the OUT pad determine the value of the resistor-divider, first select R1 and the nearest PGND pad. between 2kI and 10kI and then use the following equa- 4) Verify that a shunt is installed on pins 1-2 of jumper tion to calculate R2: JU1. R2 = (V x R1)/(V - V ) FB OUT FB 5) Verify that a shunt is installed on pins 2-3 of jumper where V is equal to the reference voltage at FB JU3. SS/REFIN and V is the output. If no external refer- OUT 6) Turn on the DC power supply. ence is applied at SS/REFIN, the internal reference is automatically selected and V becomes 0.6V. In this FB 7) Enable the load. case, R2 is not needed for V = 0.6V. OUT 8) Verify that the voltmeter displays 1.8V. When R2 is changed, compensation components must be recalculated to ensure loop stability (refer to Detailed Description of Hardware the Compensation Design Guidelines section in the The MAX15053 EV kit provides a proven design to MAX15053 IC data sheet). evaluate the MAX15053 high-efficiency, 2A, step-down Regulator Enable (EN) regulator with integrated switches. The applications include distributed power systems, portable devices, The IC features an enable input. For normal operation, a shunt should be installed on pins 1-2 of jumper JU1. To and preregulators. The EV kit is preset for 1.8V out- put at load currents up to 2A from a 2.7V to 5.5V disable the output, install a shunt on pins 2-3 of JU1. See Table 1 for JU1 shunt positions. input supply. The IC features a 1MHz fixed switching frequency, which allows the EV kit to achieve an all- ceramic capacitor design and fast transient responses. 2 Evaluates: MAX15053