A6285EET-T

Overview

The A6285EET-T is a 16-channel constant-current latched LED driver manufactured by Allegro MicroSystems. It operates on a logic supply voltage ranging from 3.0 V to 5.5 V and features Schmitt trigger inputs for enhanced noise immunity. The device provides up to 80 mA of constant-current sinking per output channel and includes open LED detection (LOD) capabilities. It supports dot correction with 7-bit resolution for individual channel intensity adjustment. Data input rates reach up to 30 MHz, and the unit incorporates internal under-voltage lockout (UVLO) and thermal shutdown (TSD) circuits.

Feature Summary

• Integrates 16-channel constant-current sinking outputs with active pull-ups
• Provides 7-bit dot correction resolution for precise light intensity control
• Includes open LED detection and fault flagging for system diagnostics
• Features internal thermal shutdown and under-voltage lockout protection

Applications

• LED backlighting systems
• Automotive interior lighting
• Industrial display panels

Procurement Notes

Verify the specific suffix EET against the manufacturer datasheet to confirm package type and tape-and-reel configuration. Ensure the design accounts for the 32-QFN(5x5) footprint requirements. Confirm that the 3.0 V to 5.5 V logic supply range aligns with the target system voltage. Validate that the 80 mA per channel current rating meets the load requirements without exceeding thermal limits.

Selection Notes

Select this component when high-speed data input up to 30 MHz is required alongside precise per-channel brightness control. The integrated dot correction eliminates the need for external calibration components in many applications. Consider the 32-pin QFN package for space-constrained designs requiring thermal dissipation through the exposed pad. Verify compatibility with the host controller's logic levels and SPI or shift register interface requirements.

Part Context

The A6285 belongs to Allegro's dedicated LED driver family designed for high-density illumination applications. It distinguishes itself through the combination of latched outputs and digital dot correction, allowing for uniform color and brightness across large arrays. The device targets markets demanding reliable operation under varying temperature conditions and electrical noise environments.

Replacement Considerations

The A6280 series offers similar functionality but with fewer channels and different control interfaces. Verify pinout compatibility before substitution. The A6281 provides comparable features with potential differences in output current specifications. Always consult the official datasheets to ensure functional equivalence regarding latch behavior and fault detection mechanisms.

FAQ

How does the A6285 handle LED open circuit conditions?

The device includes an Open LED Detection (LOD) feature that identifies open circuits and generates fault output flags to alert the system controller.

What is the maximum data input rate supported by this driver?

The A6285 supports high-speed data input rates up to 30 MHz, enabling rapid updates for dynamic display applications.

Can the output current be adjusted per channel?

Yes, the device features 7-bit dot correction resolution, allowing independent adjustment of light intensity for each of the 16 channels.