Class-D amplifiers enable brownout protection

11th September 2023
Mick Elliott

Mouser Electronics is now shipping the MAX9838x digital input Class-D amplifiers from Analog Devices/Maxim Integrated.

These amplifiers feature integrated IV feedback and Brownout Protection in a small 2.93 mm2, 16-pin WLP (0.4 mm pitch) space-saving package.

With a wide 2.3 V to 10 V supply voltage range, these amplifiers pair Class-AB level audio performance with the efficiency needed to extend battery life in single-cell, two-cell, and externally regulated/boosted portable applications.

The MAX98388 is optimised for up to 5.5 V applications (single-cell), while the MAX98389 is optimised for 5 V to 10 V cases (two-cell).

The device provides a PCM interface for audio playback and IV feedback data and pairs this with a standard I2C interface for device control and status readback. The PCM interface also supports audio data formats such as I2S, left justified, and TDM timing.

A clocking structure eliminates the need for an external high-frequency reference clock.

In addition to reducing device size and pin count, eliminating this clock saves interface power while reducing the risk of EMI from high-speed switching and potential board coupling issues.

Applications for the MAX9838x amplifiers include AR/VR wearables, LRA haptic drives, smartwatches, IoT devices, gaming devices, and notebooks and tablets.

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