38-Channel, Local Dimming LED Driver

The MAX25580 is a 38-channel low-side driver. The integrated current outputs can sink up to 71mA LED current each. 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 and individual PWM settings.

The device features a high-speed interface for controlling up to 61 devices in a daisy-chain configuration. In addition, they include multiple diagnostic features.

The MAX25580 is available in TQFN and TSSOP packages and operates in the -40 to +125°C temperature range.

APPLICATIONS

* Central Information Displays

* Instrument Clusters

* Interior Lighting

* Exterior Rear Lighting

* Flexible Configuration

* Optional Individual Programmable Delays

* Optional Pseudorandom Spread Spectrum onEach Output

* 38 Low-Side, Constant-Current Drivers

* Up to 71mA Peak Output Current

* 0.25V Minimum SNK Voltage Headroom

* Very Narrow Minimum Current Pulse forMaximum Dimming Ratio

* Extensive Diagnostics

* LED Integrity Test

* Shorted or Open LEDs