19-6187 Rev 1 5/12 MAX16977 Evaluation Kit Evaluates: MAX16977 General Description Features The MAX16977 evaluation kit (EV kit) demonstrates the S Wide 3.5V to 36V Input Supply Range MAX16977 2A, current-mode step-down converter with S Pin-Programmable Adjustable Output Voltage an integrated high-side switch. The EV kit operates over S Adjustable Switching Frequency (2.2MHz Default) a wide 3.5V to 36V input voltage range. The EV kit has a S Proven PCB Layout switching frequency of 2.2MHz and a voltage output of 5V at 2A. S Fully Assembled and Tested Ordering Information appears at end of data sheet. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION Not installed, ceramic capacitors 47F Q20%, 50V aluminum C14, C15 0 (0402) electrolytic capacitor C1 1 (8mm x 10.20mm) 3A, 60V Schottky diode (SMB) D1 1 Panasonic EEE-TG1H470UP Diodes B360B-13-F 4.7F Q10%, 50V X7R ceramic EXT SUP, C2, C4 2 capacitors (1210) EXT VBAT, 5 Red test points Murata GCM32ER71H475KA55L FSYNC, OUT, POWERGOOD 0.1F 10%, 50V X7R ceramic C3, C5 2 capacitors (0603) GND 4 Black test points Murata GCM188R71H104KA57D JU1 1 3-pin header 0.1F 10%, 16V X7R ceramic 4.7H, 6A inductor C6 1 capacitor (0402) L1 1 (7mm x 6.9mm) Murata GRM155R71C104K Wrth 744311470 LX 0 Not installed, red test point 22F 10%, 10V X7R ceramic C7 1 capacitor (1210) R1, R9 2 20kI Q1% resistors (0402) Murata GCM32ER71A226KE12L R2 1 12.1kI Q1% resistor (0402) R3 1 10kI 5% resistor (0402) Not installed, ceramic capacitor C8 0 (1210) R4, R6, R7, 0 Not installed, resistors (0402) R10 1F 10%, 10V X7R ceramic C10 1 capacitor (0402) R8 1 0I Q5% resistor (1210) TDK C1005X5R1A105K R12 1 0I Q5% resistor (0402) 2700pF 10%, 50V X7R ceramic Automotive step-down converter C12 1 capacitor (0402) U1 1 (16 TSSOP-EP*) Murata GRM155R71H272KA MAX16977RAUE/V+ 1 Shunt 12pF 5%, 50V C0G ceramic C13 1 capacitor (0402) PCB: MAX16977 EVALUATION 1 Murata GRM1555C1H120J KIT *EP = Exposed pad. 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.MAX16977 Evaluation Kit Evaluates: MAX16977 Component Suppliers SUPPLIER PHONE WEBSITE Diodes Incorporated 805-446-4800 www.diodes.com Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com Panasonic Corp. 800-344-2112 www.panasonic.com TDK Corp. 948-803-6100 www.component.tdk.com Wrth Electronik GmbH & Co. KG 201-785-8800 www.we-online.com Note: Indicate that you are using the MAX16977 when contacting these component suppliers. Table 1. EN Configuration (JU1) SHUNT POSITION DESCRIPTION 1-2* Connects the devices EN pin to the voltage at VSUP for normal operation. 2-3 Connects the devices EN pin to GND to enter shutdown mode. *Default position. Output Quick Start The default output of the EV kit is set at 5V. To adjust the output voltage (V ), place a 0I on R10, remove R12, OUT Required Equipment and change resistors R4 and R6 appropriately using the MAX16977 EV kit following formula: 3.5V to 36V, 3A DC power supply Electronic load capable of 2A V OUT R4 R6 1 Digital voltmeter (DVM) V FB Procedure where V = 1V. FB The EV kit is fully assembled and tested. Follow the steps below to verify board operation. Caution: Do not turn on Synchronization Input (FSYNC) supplies until all connections are completed. The EV kit uses resistor R9 to connect the FSYNC pin to ground, which sets the switching frequency to the 1) Verify that jumper JU1 is in the default position, as internal clock. shown in Table 1. An external logic-level clock can also connect to the 2) Connect the power supply between the EXT VBAT provided FSYNC test point to synchronize the device. and nearest GND test points. The external signal frequency must be 10% higher than 3) Connect the 2A electronic load between the OUT and the internal clock frequency for proper operation. nearest GND test points. Setting the Switching Frequency (FOSC) 4) Connect the DVM between the OUT and nearest GND The EV kit switching frequency is set by resistor R2, test points. connected from FOSC to GND. The switching frequency 5) Turn on the power supply. can be configured by selecting an appropriate value for 6) Enable the electronic load. R2. Use the following equation to select R2: 7) Verify that the voltage at the OUT test point is 5V. 9 26.4x10 / s R2 Detailed Description of Hardware f SW The MAX16977 EV kit demonstrates the MAX16977 where f is the desired switching frequency in hertz. SW wide input voltage range, high-frequency, step-down The adjustment range for f is 1MHz to 2.2MHz. SW converter. The EV kit operates over a wide 5V to 36V Refer to Figure 2. Switching Frequency vs. R in the FOSC input voltage range. The output voltage is set for 5V at MAX16977 IC data sheet for a graphical approach of 2A, but can be adjusted from 1V to 10V. selecting the correct R (R2) value for the desired FOSC Enable (EN) switching frequency. Place a shunt in the 1-2 position on jumper JU1 for normal operation. To place the device into shutdown mode, move the shunt on JU1 to the 2-3 position. Maxim Integrated Products 2 =