A8507ELBTR-T

Overview

The A8507ELBTR-T is a multi-output WLED and RGB driver designed for LCD monitor and television backlighting. It integrates a boost controller to drive an external MOSFET alongside six internal current sinks, each capable of delivering 80 mA. The device features fixed frequency current mode control with an integrated gate driver and adjustable switching frequencies ranging from 250 kHz to 1 MHz. It includes active current sharing between LED strings for ±0.6% accuracy, overvoltage protection, and open or shorted LED string protection. Available in SOIC 24-pin or TSSOP 24-pin packages.

Feature Summary

• Integrates a boost controller with an external MOSFET driver and six individual 80 mA current sinks for flexible backlighting configurations.
• Provides active current sharing between LED strings to ensure high matching accuracy and uniform brightness across multiple outputs.
• Includes comprehensive protection mechanisms such as overvoltage protection, overtemperature shutdown, cycle-by-cycle current limit, and undervoltage lockout.

Applications

• Backlighting for LCD monitors
• Backlighting for televisions
• WLED and RGB lighting systems

Procurement Notes

Verify the specific package variant (SOIC or TSSOP) required for your PCB layout, as the base part number may correspond to different physical footprints depending on the suffix. Confirm that the external MOSFET selected matches the voltage and current ratings supported by the integrated boost controller. Ensure thermal management strategies align with the exposed pad requirements if using the TSSOP-EP version.

Selection Notes

Select this component when designing compact backlight solutions requiring precise current matching across multiple LED strings. The integrated boost controller reduces the need for external PWM dimming circuitry, simplifying the design. Consider the adjustable switching frequency range to optimize efficiency and minimize electromagnetic interference based on the specific application constraints.

Part Context

The A8507 belongs to Allegro's family of flexible WLED and RGB backlight drivers intended for medium-sized displays. It replaces discrete boost converter and current sink designs, offering a consolidated solution for manufacturers seeking to reduce bill of materials and board space while maintaining high performance standards for visual quality.

Replacement Considerations

The A8500EECTR-T is listed as a similar part within the same product family, offering flexible WLED/RGB backlighting capabilities for medium-size LCDs. Verify pin compatibility and electrical specifications before substitution.