19-5772 Rev 1 1/12 MAX16955 Evaluation Kit Evaluates: MAX16955 General Description Features The MAX16955 evaluation kit (EV kit) is a fully assem- S 6V to 36V Input Range bled and tested PCB that contains all the components S 5V at Up to 5A Output necessary to evaluate the performance of the MAX16955 S 400kHz Switching Frequency synchronous PWM step-down controller. The device is S Selectable Forced Fixed-Frequency PWM Mode, available in a 16-pin TSSOP package and features an SKIP Mode, or External Synchronization exposed pad for enhanced thermal dissipation. The EV kit requires a 6V to 36V power supply for normal S Power-Good LED Indicator operation. The EV kit output is configured to 5V and can S Enable Input deliver up to 5A output current. The EV kit can be easily S Cycle-by-Cycle Current Limit and Thermal reconfigured to operate the controller in continuous PWM Protection mode, SKIP mode, or external synchronization operation. S Proven PCB Layout The controller switching frequency is set to 400kHz. The EV kit includes a jumper to enable the cir cuit and an LED S Fully Assembled and Tested to monitor the power-good output. Ordering Information appears at end of data sheet. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION 4.7FF Q10%, 50V X7R ceramic BIAS, EN, FSYNC, C11 1 capacitor (1206) OUT (x2), 7 Red multipurpose test points Murata GRM31CR71H475K SUP (x2) 0.22FF Q10%, 50V X7R 4.7FF Q10%, 50V X7R ceramic C1 1 ceramic capacitor (0805) C13 1 capacitor (1210) Murata GRM21BR71H224K Murata GRM32ER71H475K 60V, 3A Schottky diode (SMB) 47FF Q20%, 50V electrolytic D1 1 Diodes Inc. B360B-13-F C2 1 capacitor (D8) Panasonic EEE-FK1H470XP D2 1 Red LED (0603) Not installed, Schottky diode 0.1FF Q10%, 50V X7R ceramic D3 0 (3 SOT23) C4 1 capacitor (0603) Murata GRM188R71H104K JU1 1 3-pin header JU2 1 2-pin header Not installed, ceramic C5, C9 0 capacitors (0603) 5.5FH Q20%,10A inductor L1 1 Wrth 744325550 100FF Q20%, 6.3V X5R C6 1 ceramic capacitor (1210) 40V, 6A dual n-channel TDK C3325X5R0J107M N1 1 MOSFET (8 SO) Fairchild FDS8949 47FF Q20%, 6.3V X7R ceramic C7 1 capacitor (1210) PGND (x5), 6 Black multipurpose test points Murata GRM32ER70J476M SGND R2, R5, R6 0 Not installed, resistors (0603) 1FF Q10%, 16V X7R ceramic C8 1 capacitor (0603) 0.015I Q1%, 1/2W resistor Murata GRM188R71C105K R4 1 (1206) IRC LRF1206LF-01-R015-F 6800pF Q10%, 50V X7R R7, R12 2 0I Q5% resistors (0603) C10 1 ceramic capacitor (0603) Murata GRM188R71H682K R8 1 66.5kI Q1% resistor (0603) 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.MAX16955 Evaluation Kit Evaluates: MAX16955 Component List (continued) DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION R9 1 13kI Q1% resistor (0603) 2 Shunts R10 1 10kI Q5% resistor (0603) PCB: MAX16955 EVALUATION 1 KIT R11 1 51.1kI Q1% resistor (0603) Synchronous buck converter U1 1 (16 TSSOP-EP) Maxim MAX16955AUE/V+ Component Suppliers SUPPLIER PHONE WEBSITE Diodes Incorporated 805-446-4800 www.diodes.com Fairchild Semiconductor 888-522-5372 www.fairchildsemi.com IRC, Inc. 361-992-7900 www.irctt.com Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com Panasonic Corp. 800-344-2112 www.panasonic.com TDK Corp. 847-803-6100 www.component.tdk.com Wrth Electronik GmbH & Co. KG 201-785-8800 www.we-online.com Note: Indicate that you are using the MAX16955 when contacting these component suppliers. 7) Turn on the power supply and set to 12V with a 1A Quick Start current limit. Required Equipment 8) Enable the 1A electronic load. MAX16955 EV kit 9) Verify that the red LED (D2) is off and the DVM at OUT 12V, 1A power supply measures 5V. An electronic load capable of sinking 1A (e.g.,HP6060B) Detailed Description of Hardware Two digital voltmeters (DVMs) The MAX16955 EV kit is a fully assembled and tested Procedure PCB that contains all the components neces sary to The EV kit is fully assembled and tested. Follow the steps evaluate the performance of the MAX16955 synchronous below to verify board operation: PWM step-down controller. The device is available in a 1) Verify that a shunt is installed across pins 2-3 on 16-pin TSSOP package and features an exposed pad for jumper JU1. thermal dissipation. The device has a 3.5V to 36V input voltage range. The EV kit circuit is designed to operate 2) Verify that a shunt is not installed across jumper JU2 from a single DC power supply ranging from 6V to 36V. (output enabled). The EV kit is configured to output 5V and provides up to 3) Connect the load across the OUT and PGND test 5A load current at the OUT and PGND test points. The points. switching frequency is set to 400kHz using resistor R8. 4) Connect the first DVM across the SUP and PGND test The peak inductor current is set to 5.3A using resistor points. R4. The EV kit can be configured to operate in forced 5) Connect the second DVM across the OUT and PGND fixed-frequency PWM mode, low-quiescent current SKIP test points. mode, or external synchroniza tion using jumper JU1. The EV kit features test points to evaluate the enable (EN) 6) Connect the power supplys positive and ground feature and to monitor the BIAS output voltag e. A terminals to the SUP and PGND test points, red LED (D2) is available to monitor the power-good respectively. (PGOOD) output signal. Maxim Integrated Products 2