Analog Devices Inc. MAX25169EVKIT Driver Evaluation Kit
Analog Devices Inc. MAX25169EVKIT Driver Evaluation Kit demonstrates the MAX25069/MAX25169 IC, a highly integrated power supply plus LED backlight driver for automotive TFT-LCD applications. The evaluation kit is a fully assembled and tested surface-mount PCB that provides a complete power-management solution for automotive displays. The MAX25169EVKIT demonstrates one current-mode boost converter with sequencing switch (HVINP–AVDD), one current-mode inverting regulator (NAVDD), positive and negative gate-voltage controllers (VGON), and (VGOFF), and a boost converter that powers a six-string LED driver.
The Analog Devices Inc. MAX25169EVKIT can be configured to operate in a stand-alone or I2C mode. The evaluation kit demonstrates the IC’s other features, such as adjustable output voltage, extensive diagnostics to fulfill ASIL-B safety level, thermal shutdown, and phase-shifted pulse-width modulation (PWM) dimming. Dimming can be performed externally using a PWM signal applied to the DIM pad or internally by programming the desired dimming frequency and individual duty cycle through I2C. The hybrid dimming feature can be enabled through a register bit to reduce EMI.
The MAX25169EVKIT provides an I2C interface that can operate with the PICO BOARD MAX32625 or a third-party I2C master, such as a general-purpose microcontroller. The evaluation kit also includes Windows®-compatible software that provides a simple graphical user interface (GUI) for exercising the features of the IC.
Features
- Demonstrates robustness of MAX25069 or MAX25169 ASIL version
- 2.65V to 5.5V input range for the TFT-LCD power section
- Wide 4.5V to 36V input range for LED driver section
- The selectable switching frequency (2.1MHz or 420kHz) with spread-spectrum option on the TFT power section
- 2.2MHz or 400kHz resistor-programmable switching frequency with spread-spectrum option on LED driver section with six 150mA LED drivers
- Synchronization input for 400kHz to 2.2MHz switching frequency
- Default output voltages (stand-alone mode)
- 6.8V output at 200mA (boost converter)
- -6.8V output at -200mA (inverting regulator)
- 12.8V output at 15mA (positive-charge pump regulator)
- -9.5V output at 15mA (negative-charge pump regulator)
- On-board programmability for other values in the available set
- Phase-shift dimming option
- Demonstrates cycle-by-cycle current limit and thermal-shutdown features
- Demonstrates wide dimming ratio
- Demonstrates hybrid dimming for better EMI and acoustic performance and higher dimming ratio
- Demonstrates fade in/out for smooth brightness transition
- Designed to show the thermal foldback function
- I2C programmability
- Dedicated GUI
- Full sequencing flexibility
- Proven PCB layout
- Fully assembled and tested
Required Equipment
- MAX25169EVKIT evaluation kit
- 2.65V to 5.5V, 3A DC power supply
- 4.5V to 36V, 10A DC power supply
- Digital voltmeters (DVM)
- Six series-connected HB LED strings (10 LEDs each) rated to no less than 150mA
- A current probe to measure the HB LED current
- USB cable
- Windows®-compatible PC with a spare USB port
Additional Resources
Board Layout
Related Product
Analog Devices Inc. MAX25169 6-Channel LED Backlight Driver
LED backlight driver IC and highly integrated TFT power supply for automotive TFT-LCD applications.
Related Development Tool
Analog Devices / Maxim Integrated MAX32625PICO Evaluation Board
Rapid development platform based on the MAX32625 Arm® Cortex-M4 Microcontroller with FPU.