Click here for production status of specific part numbers. Evaluate: MAX20004E/MAX20006E/ MAX20006E/MAX20008E MAX20008E Evaluation Kit General Description Quick Start The MAX20006E/MAX20008E evaluation kits (EV kits) Required Equipment demonstrate the MAX20006E/MAX20008E high-voltage, MAX20006E/MAX20008E EV kit current-mode, synchronous step-down converters with 14V, 4A DC power supply low operating current. The EV kits operate over a wide 3.5V-to-36V input range. The output is set for 5V in the Electronic load capable of 8A default configuration, but can be adjusted between 1V Digital voltmeter (DVM) and 5V with appropriate components. The MAX20006E/ MAX20008E current limit supports a nominal output cur- Procedure rent of 6A or 8A, respectively. The EV kit is fully assembled and tested. Follow the steps below to verify board operation: The EV kit switching frequency is set for 2.1MHz (MAX20006EEVKIT ) or 400kHz (MAX20008EEVKIT ) 1) Verify that all jumpers are in their default positions, in the default configuration. The switching frequency is as shown in Table 1. fixed internally and can be synchronized to an external 2) Connect the 14V power supply between the V and IN signal within the specified range. The EV kits can be set nearest GND input terminals on the EV kit. for fixed-frequency (PWM mode) or pulse-skipping (SKIP 3) Connect the electronic load between the V mode) for light load efficiency through the provided on- OUT and nearest GND output terminals on the EV board jumper. kit and set for 6A (MAX20006EEVKIT ) or 8A (MAX20008EEVKIT ). Benefits and Features 4) Connect the DVM between the V and nearest 3.5V to 36V Input Supply Range OUT GND output terminals on the EV kit. 15A No-Load Quiescent Current in Skip Mode 5) Set the power supply to 14V and 4A current limit. High-Efficiency Synchronous DC-DC Converter with Turn on the power supply. Integrated FETs 6) The voltmeter should display an output voltage of External Frequency Synchronization (SYNC) Input 5V 2%. Internal Soft-Start 7) Turn on the electronic load and verify that the output Fixed 3.3V/5.0V/3.9V Output or Resistor voltage is 5V. Programmable 1V to 5V Output Low Dropout (98% Effective Duty Cycle Operation) 2% Output Voltage Accuracy Table 1. Default Jumper Settings RESET Output Proven PCB Layout SHUNT JUMPER FUNCTION POSITION Fully Assembled and Tested JU1, EN Middle-ON Buck controller enabled JU3, SS Middle-OFF Spread spectrum disabled Ordering Information appears at end of data sheet. PGOOD is pulled up by V BIAS JU2, SYNC Middle-PWM when OUT is in regulation 319-100393 Rev 1 6/20MAX20006E/MAX20008E Evaluate: MAX20004E/MAX20006E/ Evaluation Kit MAX20008E JU2, the switching frequency can be synchronized to an Detailed Description appropriate external signal applied to the SYNC input The MAX20006E/MAX20008E EV kits come fully assem- terminal. bled and tested. The MAX20006EVKIT is populated with the MAX20006EAFOA/VY+, and the MAX20008EEVKIT RESET Output is populated with the MAX20008EAFOD/VY+. Other con- The EV kit provides a RESET output to monitor the status verters in the family can be tested on the same EV kit, but of the device output. The RESET output is an open-drain changing the IC or the output voltage may also require output from the IC with an external pullup resistor to V OUT changing other components. Consult the IC data sheet on the EV kits. Refer to the IC data sheet for details on the for guidance on selecting the proper ICs and external RESET functionality. components. Setting the Output Voltage Switching Frequency/External in Buck Converters Synchronization Populating R5 with a 0 jumper connects FB to BIAS for The IC can operate in either forced-PWM mode or in SKIP a fixed 3.9V or 5V (EV kit default output), or a fixed 3.3V mode. Place a shunt in the middle-FPWM position on JU2 output voltage, depending on the IC version. To set the to select forced-PWM mode at the internally-programmed output to other voltages between 1V and 5V, remove R9, frequency. Removing the shunt from JU2 or placing a populate R3 with a 0 jumper, and populate R1/R2/C17 shunt in the middle-skip position on jumper JU2 causes with the appropriate values. Other component modifica- the IC to enter SKIP mode for maximum light load effi- tions might also be required. Refer to the IC data sheet ciency. With a shunt in the middle-skip position on jumper for details on setting the output voltage. Table 2. Component List Parts Common to All Variants PART QTY DESCRIPTION MANUFACTURER PART GND, V , VOUT, BANANA JACK UNINSULATED IN 4 POMONA 3267 GND THREADED EXTERNAL NUT GND, V , SYNC, IN 6 WIRE LOOP RESET, VOUT, GND C1, C2, C6, C7, C12, 8 CAP CER 0.1F 100V X7R 0603 MURATA GRJ188R72A104KE11D C13, C14, C16 C3, C4 2 CAP CER 4.7F 35V X7R 0805 TDK CGA4J1X7R1V475K125AC C5 1 CAP ALUM 330F 20% 35V SMD PANASONIC EEE-FK1V331P C15 1 CAP CER 2.2F 10V X7R 0603 TDK C1608X7R1A225K080AC C17 NP C18, C19 NP 10000pF FT CAP 50V 1A 0603 TDK YFF18AC1H103MT0Y0N FB1 1 FERRITE CHIP 60 6A 1806 MURATA BLM41PG600SH1L TE JU1, JU2, JU3 3 3-PIN HEADER 0.100 40POS CUT TO FIT 4-103327-0 CONNECTIVITY L2 1 INDUCTOR 1H SMD TDK SPM5030T-1R0M-HZ R1, R2, R3, R8 NP R4, R6, R7 2 RES SMD 100K 1% 1/10W 0603 PANASONIC ERJ-3EKF1003V R5 2 RES SMD 0 JUMPER 1/10W 0603 PANASONIC ERJ-3GEY0R00V Maxim Integrated 2 www.maximintegrated.com