4 × 24 Automotive LED Matrix Driver

The MAX25500 is a 4 × 24-channel modular matrix backlight driver for use with local-dimming automotive displays. The integrated current outputs can sink up to 72mA Light Emitting Diode (LED) current each. The source drive pins provide current to the columns of the matrix on a multiplexed basis. Device power comes from an external 3.3V or 5V supply, while the LED current-sink outputs can operate at up to 14V.

A feedback output pin (FB) is provided to control an external DC-DC converter so that voltage headroom can be optimized and the overall system power dissipation re

The device is highly flexible due to its programmability using the serial peripheral interface (SPI). Among the programmable parameters are the LED current, individual pulse-width modulation (PWM) settings, and multiplex ratio.

The device features a high-speed SPI for control using a daisy-chain or star configuration. Up to 16 devices can be daisy-chained to reduce connection complexity.

The MAX25500 is available in TQFN and TSSOP packages, and operates in the −40°C to 125°C temperature range.

Applications

* Central Information Displays

* Instrument Clusters

* Interior Lighting

* Flexible Configuration

* Integrated Column Drivers

* Integrated Column Drivers

* Programmable Dither for Enhanced Resolution

* Optional Individual Programmable Delays

* Optional Pseudorandom Fine Delay on Each Output

* Extensive Diagnostics

* Shorted or Open LEDs

* Programmable VLED Undervoltage/Overvoltage Detection with Flag

* Adjacent SNK to SNK Short Detection

* Shorted SNK or SRC to GND

* ISET Out of Range

* Thermal Warning/Shutdown