LM3432BSQE/NOPB

Overview

The LM3432BSQE/NOPB is a DC-DC regulator IC designed for LED driver applications, manufactured by Texas Instruments. It utilizes a boost topology to regulate current for high-brightness LEDs. The device features six independent output channels, each capable of delivering up to 40mA of constant current. It supports both analog and PWM dimming methods for precise brightness control. The component operates with a supply voltage range from 6V to 40V and can drive loads up to 80V. It is housed in a 24-WQFN (4x5) package with an exposed pad for thermal management. The integrated internal switch simplifies the external circuit design.

Feature Summary

• Six-channel constant current regulation for multi-string LED arrays
• Supports combined analog and PWM dimming control interfaces
• Integrated high-voltage internal power switch for simplified design
• Boost converter topology suitable for driving series LED strings

Applications

• Backlighting systems for displays
• High-brightness LED lighting modules
• Automotive interior or exterior lighting circuits
• Portable electronic device illumination

Procurement Notes

Verify component status as obsolete before integration. Confirm pin compatibility and thermal requirements for existing designs. Check for qualified replacement parts if new production is required. Ensure datasheet revisions match design specifications. Validate supplier authenticity through authorized channels only.

Selection Notes

Select this part for applications requiring multiple LED channels with independent current control. Consider the 80V output limit when designing series LED configurations. Evaluate thermal performance due to the QFN package type. Ensure input voltage ranges align with system power supplies. Verify dimming signal compatibility with controller microcontrollers.

Part Context

This component belongs to the LM3432 family of LED drivers from Texas Instruments. It is specifically the QSOP/QFN variant with automotive-grade qualification indicated by the 'SQ' suffix. The 'NOPB' designation confirms lead-free packaging compliant with RoHS standards. It shares functional similarities with other LM3432 models but differs in package and specific electrical tolerances.

Replacement Considerations

The LM3432BSQ/NOPB is listed as a similar substitute. Verify pinout and electrical parameters against the original datasheet. Check for any changes in dimming characteristics or thermal resistance. Ensure the alternative meets the same automotive qualification standards if applicable.

FAQ

What is the maximum output voltage capability?

The device supports output voltages up to 80V, allowing for series connection of multiple LEDs.

How many output channels are available?

The LM3432BSQE/NOPB provides six independent constant current output channels.

Does it support PWM dimming?

Yes, the IC supports both analog and pulse-width modulation (PWM) dimming methods.