Click here to ask about the production status of specific part numbers. Evaluates: MAX20446B MAX20446B Evaluation Kit General Description Features The MAX20446B evaluation kit (EV kit) demonstrates the Demonstrates Robustness of MAX20446B MAX20446B integrated 6-channel high-brightness (HB) Wide 4.5V to 36V Input Operating Range (Up to 52V 2 LED driver with boost controller and I C interface for Load Dump) automotive displays. Powers HB LEDs (Up to Six Strings) for Medium-to- The EV kit operates from a DC supply voltage between Large-Sized LCD Displays in Automotive and Display 4.5V and 36V and the switching frequency can be set Backlight Applications 2 either at 2.2MHz or at 400kHz. The EV kit operates in I C 400kHz to 2.2MHz Resistor-Programmable Switching mode only. Spread-spectrum mode (SSM) is enabled by Frequency with Spread-Spectrum Option default for electromagnetic interference (EMI) improve- ment but can be disabled by acting on a register bit. The Phase-Shift Dimming Option EV kit demonstrates phase-shifted pulse-width modula- Demonstrates Cycle-by-Cycle Current Limit and tion (PWM) dimming. Dimming can be performed exter- Thermal-Shutdown Features nally using a PWM signal applied to the DIM PCB pad or Demonstrates Wide Dimming Ratio internally by programming the desired dimming frequency 2 Demonstrates Fail-Safe Operation and individual duty cycle through I C. The hybrid dimming feature can be enabled through a register bit to reduce 2 I C Programmability EMI. The EV kit also demonstrates short-LED, open-LED, Dedicated GUI boost output undervoltage, as well as overvoltage- and Proven PCB Layout and Thermal Design overtemperature-fault protection. Fully Assembled and Tested For operation at switching frequencies other than 2.2MHz or 400kHz, the external components should be chosen according to the calculations in the MAX20446B IC data MAX20446B EV Kit Files sheet. FILE DESCRIPTION 2 The EV kit provides an I C interface that can oper- MAX20446BGUISetupV01.exe Windows GUI Installer ate in conjunction with the Maxim command module 2 (MINIQUSB+) or a third-party I C master. The EV kit also includes Windows-compatible software that provides a simple graphical user interface (GUI) for exercising the Ordering Information appears at end of data sheet. features of the IC. Windows is a registered trademark and registered service mark of Microsoft Corporation. 319-100670 Rev 0 1/21Evaluates: MAX20446B MAX20446B Evaluation Kit 9) Connect the MINIQUSB+ interface boards P3 Quick Start header to the J24 header on the EV kit. Required Equipment 10) Connect the positive terminal of the power supply to MAX20446B EV kit the IN PCB pad. Connect the negative terminal of 5V to 36V, 4A DC power supply the power supply to a PGND PCB pad. Two digital voltmeters (DVMs) 11) Connect a DVM across the OUT1 and GND PCB pads. Six series-connected HB LED strings (6 LEDs each) rated to no less than 120mA 12) Connect the six LED strings from VOUT to the OUT1, OUT2, OUT3, OUT4, OUT5, and OUT6 PCB pads. Current probe to measure the HB LED current 13) Clip the current probe across the channel 1 HB MINIQUSB+ interface board with USB cable LED+ wire to measure the LED current. Windows-compatible PC with a spare USB port 14) Turn on the power supply and set to 12V. The green Procedure LED (DS1) should be on at this point. The EV kit is fully assembled and tested. Follow the steps 15) Launch the EV kit software application. to verify board operation. 16) From the EV kit software toolbar, select Device Caution: Do not turn on the power supply until all 2 Scan for Address. The GUI scans the I C bus for connections are completed. available slave addresses on the bus and selects the 2 first one (in this case, the MAX20446B I C address). 1) Visit www.maximintegrated.com to download the 2 Press OK once the MAX20446B I C address has latest version of the EV kit software, been found. MAX20446BGUISetupV01.exe, from the products landing page. 17) Verify that the status bar in the bottom-right corner of the GUI displays EV Kit: Connected, as shown in 2) Install the EV kit software (GUI) on your PC by run- Figure 1. ning the MAX20446BGUISetupV01.exe program. The EV kit software application is installed together 18) Select the desired OUT current value (45mA to with the required MINIQUSB+ drivers. 120mA in 5mA steps) in the 0x02 ISET register group box by acting on the ISET slider bar, then click 3) Verify that jumper J17 is closed and that jumper J22 the Refresh button. is open (2.2MHz switching frequency selected). 19) Check ENA to activate the driver in the 0x02 ISET 4) Verify that jumper J1 is closed (DS1 green LED register group box. connected). 20) Measure the voltage from each of the OUT PCB 5) Verify that jumper J23 is closed (FSEN function pads to PGND and verify the lowest voltage is ap- disabled). proximately 1V. 6) Verify that jumper J20 is closed (FAULT signaling 21) Measure the LED current using the current probe enabled). and verify all channels. 7) Verify that a shunt is installed across pins 1-2 on 22) For more details on how to use the GUI and all the jumper J2 (device enabled). features available, click on the GUI Help menu item. 8) Verify that jumpers JMP1JMP3, JMP6, JMP7, and JMP9 have shunts installed across pins 1-2 (bleed resistors connected, all current sinks enabled). Maxim Integrated 2 www.maximintegrated.com