Evaluates: MAX15058 19-5665 Rev 0 12/10 MAX15058 Evaluation Kit General Description Features The MAX15058 evaluation kit (EV kit) provides a proven S Operates from a 2.8V to 5.5V Input Supply design to evaluate the MAX15058 high-efficiency, 3A, S All-Ceramic Capacitor Design step-down regulator with integrated switches. The EV S 1MHz Switching Frequency kit is preset for 1.8V output at load currents up to 3A S Output Voltage Range: 0.6V Up to (0.94 x V ) from a 2.8V to 5.5V input supply. The IC features a IN 1MHz fixed switching frequency, which allows the EV S Enable Input/Power-Good Output kit to achieve an all-ceramic capacitor design and fast S Selectable Skip-Mode Functionality transient responses. S Proven PCB Layout S Fully Assembled and Tested Ordering Information PART TYPE MAX15058EVKIT+ EV Kit +Denotes lead(Pb)-free and RoHS compliant. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION JU1, JU3 2 3-pin headers Not installed, ceramic C1, C8 0 capacitors (1206) JU2 1 2-pin header 22FF Q20%, 6.3V X5R ceramic 1FH, 9A, 13.1mI inductor C2, C7, capacitors (1206) (5.2mm x 5.5mm x 3mm) 3 C10 Murata GRM31CR60J226K Vishay IHLP2020CZER1R0M11 L1 1 TDK C3216X5R0J226M Vishay IHLP2020CZER1R0M01 ICE IN06142 1000pF Q10%, 50V X7R (5mm x 5mm x 3mm, 5.8A) ceramic capacitors (0603) C3, C6 2 R1 1 8.06kI Q1% resistor (0603) TDK C1608X7R1H102K R2 1 4.02kI Q1% resistor (0603) Murata GRM188R71H102K R3 1 5.36kI Q1% resistor (0603) 22000pF Q10%, 50V X7R R4 1 20kI Q5% resistor (0603) ceramic capacitor (0603) C4 1 R5 1 1.2I Q5% resistor (0603) Murata GRM188R71H223K R6 1 1kI Q5% resistor (0603) TDK C1608X7R1H223K 3A step-down regulator (9 WLP) Not installed, ceramic U1 1 C5 0 Maxim MAX15058EWL+ capacitor (0603) 3 Shunts 100pF Q10%, 6.3V X7R ceramic PCB MAX15058 EVALUATION C9 1 capacitor (0603) 1 KIT+ TDK C1608X7R1H101K 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.MAX15058 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 MAX15058 when contacting these component suppliers. Reference Input and Soft-Start (SS/REFIN) Quick Start The device utilizes an adjustable soft-start function to Recommended Equipment limit inrush current during startup. The soft-start time is MAX15058 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 3A 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. IN pad and the negative terminal to the nearest PGND Setting the Output Voltage pad. The EV kit can be adjusted from 0.6V up to 0.94 x V IN 2) Connect the positive terminal of the 3A load to the by changing the values of resistors R1 and R2. To OUT pad and the negative terminal to the nearest determine the value of the resistor-divider, first select R1 PGND pad. between 2kI and 10kI and then use the following equa- 3) Connect the digital voltmeter across the OUT pad tion to calculate R2: and the nearest PGND pad. R2 = (V x R1)/(V - V ) FB OUT FB 4) Verify that a shunt is installed on pins 1-2 of jumper where V is equal to the reference voltage at FB JU1. SS/REFIN and V is the output. If no external refer- OUT 5) Verify that a shunt is installed on pins 2-3 of jumper ence is applied at SS/REFIN, the internal reference is JU3. automatically selected and V becomes 0.6V. In the FB 6) Turn on the DC power supply. case of V = 0.6V, set R2 to 0I. OUT 7) Enable the load. When R2 is changed, compensation components C5, C6, and R3 must be recalculated to ensure loop stability 8) Verify that the voltmeter displays 1.8V. (refer to the Compensation Design Guidelines section in the MAX15058 IC data sheet). Detailed Description of Hardware Regulator Enable (EN) The MAX15058 EV kit provides a proven design to evaluate the MAX15058 high-efficiency, 3A, step-down The IC features an enable input. For normal operation, a shunt should be installed on pins 1-2 of jumper JU1. To regulator with integrated switches. The applications include distributed power systems, portable devices, disable the output, install a shunt on pins 2-3 of JU1. See Table 1 for JU1 shunt positions. and preregulators. The EV kit is preset for 1.8V out- put at load currents up to 3A from a 2.8V to 5.5V 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: MAX15058