TFA9887UK/N2AZ

Overview

The TFA9887UK/N2AZ is a mono Class-D audio amplifier system integrating an adaptive DC-to-DC converter and CoolFlux DSP. It delivers 2.65 W RMS output power into a 4 Ω load at 3.6 V supply voltage with THD of 1%. The device operates on a battery supply range of 2.5 V to 5.5 V and utilizes a digital I2S input interface alongside an I2C control bus. It features a 29-bump WLCSP package with a 400 μm pitch.

Feature Summary

• Sophisticated speaker-boost and protection algorithm maximizing acoustic output while preventing diaphragm excursion and voice coil temperature exceedances.
• Adaptive DC-to-DC conversion that boosts supply voltage only when necessary, optimizing headroom and limiting quiescent consumption.
• Low RF susceptibility due to a digital input interface insensitive to clock jitter and second-order closed-loop architecture.
• Fully embedded software for environmental awareness, automatically adapting to acoustic changes and box leakage without additional licensing.

Applications

• Mobile phones
• Tablets
• Ultrabooks and Notebooks
• Portable gaming devices
• MP3 players and portable media players

Procurement Notes

Verify the specific ordering suffix N2AZ against current manufacturer documentation to confirm packaging details and compliance status. Confirm availability as product lifecycle status may have changed since datasheet publication. Ensure design-in compatibility with host processor interfaces before procurement.

Selection Notes

Select this component for applications requiring high efficiency and compact form factors where speaker protection is critical. The integrated DSP eliminates the need for external processing for basic boost functions. Verify that the host system supports the required I2S and I2C interfaces and can accommodate the WLCSP package constraints during layout.

Part Context

This part belongs to NXP's Smart Audio series, designed to enhance sound quality in mobile devices using miniature speakers. It combines a Class-D amplifier with intelligent algorithms to safely drive speakers nominally rated for lower power levels, addressing the industry challenge of improving audio performance in increasingly thin consumer electronics.

Replacement Considerations

Consult official NXP documentation for confirmed substitute part numbers. Do not assume functional equivalence with other audio amplifiers without verifying pinout, interface, and algorithmic feature alignment.

FAQ

How does the TFA9887 protect the speaker?

It uses an embedded CoolFlux DSP algorithm to monitor and limit membrane excursion and voice coil temperature in real-time, ensuring they never exceed rated limits regardless of the acoustic environment.

What is the function of the adaptive DC-to-DC converter?

The converter boosts the battery supply voltage only when the audio signal level is high, maximizing output power headroom while minimizing current consumption and heat generation during low-level playback.