NAU8318VG

Overview

The NAU8318VG is a mono high-efficiency filter-free Class-D audio amplifier manufactured by Nuvoton Technology Corporation. It drives a 4Ω load with up to 3.2W output power at 5V supply and 10% THD+N. The device operates within a battery supply range of 2.5V to 5.25V and features low standby current, fast start-up time, and superior EMI performance. Key electrical parameters include 91% efficiency, 82dB PSRR at 217Hz, and an output offset voltage of +/- 1mV. It supports sampling rates from 8kHz to 96kHz and includes self-recovery protection mechanisms such as OCP, UVLO, OTP, and CTP.

Feature Summary

• Pin-selectable gain settings and I2S/PCM interface configurations for flexible system integration
• Integrated beep generator with selectable output levels controlled via the BEEP pin
• Advanced click-and-pop suppression and beat tone mitigation for improved audio quality
• True filter-less operation capability reducing external component count

Applications

• Gaming Controllers
• Wireless (VR) Headsets
• Smart Remote Controllers
• Personal Media Players
• Chromebooks / Notebooks / Tablet PCs

Procurement Notes

Verify the specific package variant when ordering, as the NAU8318 family includes both WLCSP-14 and QFN-20 options. The VG suffix specifically denotes the 14-ball Miniature WLCSP package with a 0.4 mm pitch. Ensure that the host controller provides the necessary digital supply voltage (VDD18) and that the EN pin logic levels are compatible with the specified input thresholds. Confirm compliance requirements such as RoHS and TSCA if applicable to your region.

Selection Notes

Select the NAU8318VG for portable applications requiring high efficiency and minimal PCB space due to its filter-less design and compact WLCSP packaging. Consider the pin-selectable gain modes if hardware flexibility is needed without software control overhead. Evaluate the thermal performance in the WLCSP package against the QFN-20 option if higher power dissipation or better heat sinking is required for sustained high-output operations.

Part Context

The NAU8318 series belongs to Nuvoton's portfolio of high-efficiency Class-D audio amplifiers designed for mobile and portable electronics. The VG suffix identifies the specific 14-ball WLCSP package variant, distinguishing it from the QFN-20 version (NAU8318YG). This component is part of a broader ecosystem including evaluation boards like the NV-NAU83G20S, which utilize similar technology for development purposes.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Users should consult Nuvoton official resources for cross-reference information.