Click here for production status of specific part numbers. Evaluates: MAX20444B MAX20444B Evaluation Kit General Description Benefits and Features The MAX20444B evaluation kit (EV kit) demonstrates the Demonstrates Robustness of MAX20444B MAX20444B integrated, 4-channel, high-brightness LED Wide 4.5V to 36V Input Operating Range 2 driver with boost controller and I C interface for automo- (Up to 52V Load Dump) tive displays. Powers HB LEDs (Up to four 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 at Backlight Applications either 2.2MHz or 400kHz. The EV kit can be configured 400kHz to 2.2MHz Resistor-Programmable Switching 2 to operate in stand-alone mode or in I C mode. Spread- Frequency with Spread-Spectrum Option spectrum mode (SSM) for EMI improvement is enabled by default, but it can be disabled trough 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, which can be performed either Thermal-Shutdown Features externally using a PWM signal applied to the DIM PCB Demonstrates Wide Dimming Ratio pad or internally by programming the desired dimming 2 Demonstrates Failsafe Operation frequency and individual duty cycle using I C. The hybrid dimming feature can also be enabled through a register 2 I C Programmability bit to reduce EMI. The EV kit also demonstrates fault pro- Dedicated GUI tection for short LED, open LED, boost output undervolt- Proven PCB and Thermal Design age and overvoltage, and overtemperature. 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 MAX20444B IC data EV Kit Contents sheet. FILE DESCRIPTION 2 The EV kit provides an I C interface that can operate in conjunction with the MINIQUSB+ adapter board or a third- MAX20444BGUISetupV01.exe Windows GUI Installer 2 party I C master. The EV kit also includes Windows - Ordering Information appears at end of data sheet. compatible software that provides a simple graphical user interface (GUI) for exercising the features of the IC. Note: The MAX20444B EV kit is identical to the MAX20444 EV kit, with the exception of the U1 component. The pho- tos and figures indicate MAX20444, but there are no dif- ferences between this version and the standard version. Windows is a registered trademark and registered service mark of Microsoft Corporation. 319-100327 Rev 0 3/19Evaluates: MAX20444B MAX20444B Evaluation Kit 12) Connect a DVM across the OUT1 and GND PCB Quick Start pads. Required Equipment 13) Connect the four LED strings from VOUT to the MAX20444B EV kit OUT1, OUT2, OUT3 and OUT4 PCB pads. 5V to 36V, 4A DC power supply 14) Clip the current probe across the channel 1 HB LED+ Two digital voltmeters (DVMs) wire to measure the LED current. Four series-connected HB LED strings 15) Turn on the power supply and set it to 12V. The green (6 LEDs each) rated to no less than 120mA LED (DS1) and the LED strings should be on at this Current probe to measure the HB LED current point. MINIQUSB+ interface board with USB cable 16) Measure the voltage from each of the OUT PCB pads to PGND and verify the lowest voltage is Windows-compatible PC with a spare USB port approximately 1V. Note: In the following sections, software-related items are 17) Measure the LED current using the current probe and identified by bolding. Text in bold refers to items directly verify all channels. from the EV kit software. Text in bold and underlined refers to items from the Windows operating system. 2 I C Mode Procedure 1) Visit www.maximintegrated/evkitsoftware to down- load the latest version of the EV kit software, MAX- The EV kit is fully assembled and tested. Perform the 20444BGUISetupV01.exe. following steps to verify board operation. Caution: Do not turn on the power supply until all connections are 2) Install the EV kit software (GUI) on your PC by completed. running the MAX20444BGUISetupV01.exe pro- gram. The EV kit software application will be installed Stand-Alone Mode together with the required MINIQUSB+ drivers. 1) Verify that jumper J17 is closed and that jumper J22 3) Verify that jumper J17 is closed and that jumper J22 is open (2.2MHz switching frequency selected). is open (2.2MHz switching frequency selected). 2) Verify that jumper J1 is closed (DS1 green LED 4) Verify that jumper J1 is closed (DS1 green LED connected). connected). 3) Verify that jumper J20 is closed (FAULT signaling 5) Verify that jumper J23 is closed (FSEN function enabled). disabled). 4) Verify that a shunt is installed across pins 1-2 on 6) Verify that jumper J20 is closed (FAULT signaling jumper J2 (device enabled). enabled). 5) Verify that a shunt is installed across pins 1-2 on 7) Verify that a shunt is installed across pins 1-2 on jumper JMP1 (hybrid dimming disabled). jumper J2 (device enabled). 6) Verify that a shunt is installed across pins 1-3 on 8) Verify that jumpers JMP1 and JMP8 have shunts in- jumper JMP8 (LED short detection enabled). stalled across pins 1-4. 7) Verify that jumpers JMP3, JMP6-JMP7, and JMP9 9) Verify that jumpers JMP3, JMP6-JMP7, and JMP9 have shunts installed across pins 1-2 (bleed resistors have shunts installed across pins 1-2 (bleed resistors connected, all current sinks enabled). connected, all current sinks enabled). 8) Verify that a shunt is installed across pins 1-2 on 10) Verify that jumpers JMP2 and JMP4 have shunts jumper JMP2 (Phase shifting enabled). installed across pins 1-3 (SDA and SCL PCB 9) Verify that a shunt is installed across pins 1-2 on pads connected to SDA/PSEN and SCL/IRANGE jumper JMP4 (LED current range set to 85-120mA). ICs pins). 10) Verify that jumper J8 is closed (LED current set to 11) Connect the MINIQUSB+ interface boards P3 head- 100mA). er to the J24 header on the EV kit. 11) Connect the positive terminal of the power supply to 12) Connect the positive terminal of the power supply to the IN PCB pad. Connect the negative terminal of the the IN PCB pad. Connect the negative terminal of the power supply to a PGND PCB pad. power supply to a PGND PCB pad. Maxim Integrated 2 www.maximintegrated.com