MSL2021-IN

Overview

The MSL2021-IN is a dual-output LED driver IC designed for offline lighting applications. It functions as an AC/DC switcher with PWM dimming capabilities, supporting flyback and step-down (buck) topologies. The device features two independent outputs to drive separate LED strings, enabling control of two-color or unequal forward voltage LEDs. It includes programmable look-up table functionality for color temperature adjustment and offers 180° phase-shifted PWM dimming between strings. The component is housed in a compact 24-VQFN (4x4 mm) package with an exposed pad to save board space.

Feature Summary

• Dual-output architecture for driving two independent LED strings
• Integrated AC/DC switching capability for offline power conversion
• Supports PWM dimming with 180-degree phase shift between output channels
• Programmable look-up table for precise color temperature management

Applications

• Offline LED lighting fixtures requiring high CRI
• Two-color LED systems using white and red or amber combinations
• Applications necessitating unequal forward voltage LED string configurations
• Space-constrained lighting designs utilizing surface mount packaging

Procurement Notes

Verify the exact suffix designation against official Microchip documentation, as Atmel was acquired by Microchip in 2016. Confirm that the specific part number corresponds to the standard MSL2021 variant without additional functional modifications implied by ordering codes. Ensure compatibility with current development tools if legacy support is required.

Selection Notes

Select this component when designing offline LED drivers that require independent control of two LED strings with distinct electrical characteristics. It is suitable for applications demanding high Color Rendering Index through mixed LED technologies. Consider the 24-VQFN package constraints and thermal requirements associated with the exposed pad design for proper heat dissipation.

Part Context

Atmel Corporation was acquired by Microchip Technology in July 2016. Products previously branded under Atmel are now managed within Microchip's portfolio. The MSL series represents specialized LED driver solutions developed during Atmel's operational period, focusing on intelligent lighting control and power efficiency for consumer and industrial markets.

Replacement Considerations

Consult Microchip's official cross-reference guides for verified substitute part numbers. The MSL2021 may have variants such as MSL2023 or MSL2024 with similar functionalities but different specifications. Verify pinout and electrical parameters before substitution.