TDF8532HH/N3K

Overview

The TDF8532HH/N3K is a four-channel Class-D audio amplifier from NXP Semiconductors, designed for automotive applications. It operates within a supply voltage range of 5.5 V to 25 V and delivers up to 80 W per channel into 2 or 4 Ω loads. The device features a single digital-feedback loop with feedback after the low-pass filter, ensuring high sound quality and reduced system cost. It supports TDM/I²S digital inputs and includes comprehensive diagnostic and protection features such as load dump protection up to 50 V.

Feature Summary

• Single digital-feedback loop architecture reduces BOM cost and improves audio quality
• Four BTL channels capable of driving 2 or 4 Ω loads, with parallel mode support
• Comprehensive diagnostics including startup checks, clip detection, and DC offset monitoring
• Robust protection mechanisms including independent current thresholds and thermal fold-back

Applications

• Automotive head-unit radios
• Vehicle sound systems
• Active noise-cancellation systems
• Electric vehicle engine sound generation

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct packaging and temperature grade specifications. Confirm availability through authorized distribution channels as production status may vary. Ensure compatibility with existing board layouts regarding the HLQFP100 package dimensions and pin configuration.

Selection Notes

Select this component for applications requiring four high-power channels within a 25 V supply limit. Consider the TDF8536HH if 45 V operation or higher power output is needed. Evaluate the interleaved power stage option if improved EMC performance is critical for the specific vehicle environment.

Part Context

This part belongs to the NXP TDF853x family of ultra-performance Class-D amplifiers. The family includes variants with three, four, or five channels, supporting both 18 V and 25/45 V supply voltages. These devices are engineered to meet AEC-Q100 standards for automotive reliability and support stop-start requirements.

Replacement Considerations

The TDF8531HH serves as a three-channel alternative, while the TDF8534HH offers five channels. For higher voltage requirements, the TDF8536HH provides four channels at 45 V. Ensure functional equivalence in terms of channel count and supply voltage before substitution.