LM27964SQX-A

Overview

The LM27964SQX-A is a white LED driver system designed for mobile phone displays. It utilizes a charge-pump topology to drive up to seven output channels, supporting regulated current levels of 30mA and 80mA per channel. The device operates within an input voltage range of 2.7V to 5.5V and features I2C-compatible brightness control. It is housed in a 24-pin WQFN package (WQFN-24) with dimensions of 4x4 mm. The component supports switching frequencies between 500kHz and 900kHz and functions across a temperature range of -30°C to +85°C.

Feature Summary

• Integrates a charge-pump-based architecture optimized for driving multiple white LEDs in compact mobile devices.
• Provides independent regulation for seven output channels with selectable current settings.
• Enables digital brightness adjustment through I2C compatible interface communication.

Applications

• Mobile phone display backlighting
• White LED driver systems
• Portable electronic device illumination

Procurement Notes

Verify the specific suffix 'A' against the manufacturer's official documentation, as it may indicate a specific revision or packaging variant distinct from standard NOPB versions. Confirm RoHS compliance status directly with the supplier, as some sources list non-compliance for this specific marking while others indicate detailed compliance. Ensure the 24-WQFN footprint matches the target PCB design constraints before finalizing procurement orders.

Selection Notes

Select this component when designing circuits requiring multi-channel white LED regulation within tight space constraints. The I2C interface allows for precise software-controlled dimming without additional hardware complexity. Consider the 2.7V minimum input requirement to ensure compatibility with single-cell lithium-ion battery systems. The 24-WQFN package offers thermal performance suitable for high-density board layouts common in modern handheld electronics.

Part Context

This part belongs to the LM27964 series of LED drivers manufactured by Texas Instruments. It is functionally similar to the LM27964SQ-A/NOPB but carries the 'X' suffix, which typically denotes a specific tape-and-reel configuration or manufacturing lot variation. The series is characterized by its integrated charge pump and multi-channel capability, distinguishing it from simpler single-channel LED controllers.

Replacement Considerations

LM27964SQ-A/NOPB is listed as a direct replacement option in distributor databases. Verify pinout compatibility and electrical specifications before substitution, as suffix variations can sometimes imply differences in packaging or minor parameter tolerances not evident in general summaries.

FAQ

What is the maximum number of output channels supported by the LM27964SQX-A?

The device supports up to seven independent output channels for driving white LEDs.

Does the LM27964SQX-A support external dimming signals?

Yes, it features I2C compatible brightness control for digital dimming management.