4x24 Automotive LED Matrix Driver with ASIL Features

The MAX25505B is a 4x24-channel modular matrix driver. The integrated current outputs can sink up to 72mA 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 reduced. The device is highly flexible due to its programmability using the SPI interface. Among the programmable parameters are the LED current, individual PWM settings, and multiplex ratio.

The device features a high-speed interface for controlling up to 16 devices in a star configuration. In addition, it includes multiple diagnostic features to aid in the building of ASIL B systems.

The MAX25505B 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

* Exterior Rear Lighting

* Flexible Configuration

* Programmable Multiplex Ratio between 4:1 and1:1

* Integrated Column Drivers

* Programmable Dither for Enhanced Resolution

* Optional Individual Programmable Delays

* Optional Pseudorandom Spread Spectrum onEach Output

* 24 Row Drivers

* Up to 72mA Peak Output Current

* Very Narrow Minimum Current Pulse forMaximum Dimming Ratio

* Optional Ghosting Elimination

* Extensive Diagnostics Supporting ASIL B

* Shorted or Open LEDs

* Programmable VLED Overvoltage Detection withFlag