AW87329 Audio iC

When a customer walks into your shop with a Redmi 7 that has no sound, weak speaker output, or a dead earpiece after a software flash or liquid damage, the AW87329 audio IC is usually the part responsible. This chip handles both the loudspeaker and receiver audio path on the board, so a fault here shows up as "no sound," "sound issue after flash," or a receiver that stays silent during calls while the speaker still works.Awinic designed the AW87329 as a third-generation Smart K amplifier, meaning it pushes musical output dynamic range and sound quality higher than older audio ICs on the same boards. It runs a Class D amplifier stage without an output filter, so idle switching current on the speaker load stays at zero when there's no input signal — this cuts unwanted hiss and heat during standby. The chip's proprietary Triple-Level Triple-Rate AGC algorithm actively manages gain in real time, which removes music noise and keeps volume consistent even at high output levels.On the power side, the AW87329 uses DO-Chargepump technology rated up to 90% efficiency, doubling the input voltage to drive the speaker harder without needing a separate boost converter on the board. This chargepump runs at 1.6MHz and includes a built-in soft-start circuit along with current-limiting and over-voltage control loops, so your repair holds up under normal daily use rather than failing again in a few weeks. Noise floor sits as low as 38µV in speaker mode with a 102dB signal-to-noise ratio, and total harmonic distortion stays at 0.02% in Class D mode — figures that matter when a customer complains about crackling or distorted playback rather than total silence.You control the AW87329 entirely through I2C, with onboard registers for chargepump output voltage, amplifier gain, and AGC parameters. This means the chip's behavior is set by firmware, not just hardware — so before you commit to an IC change, always check whether the fault is a dead chip or a software/EEPROM configuration issue after flashing. A speaker-guard function lets the amplifier limit output power in selectable steps from 0.5W to 1.5W at 8 ohms, protecting the speaker coil from damage at maximum volume, which is worth knowing when a customer reports a burnt-out speaker alongside no sound.The IC ships in a CSP-18 package measuring just 2.58mm x 2.11mm, so reballing and hot air rework demand a steady hand, a good microscope, and fine-pitch stencil work — this isn't a part you swap with a standard soldering iron tip. Built-in over-current, over-temperature, and short-circuit protection reduce the chance of cascading board damage if there's a downstream short, but they don't replace proper board-level diagnosis before you reflow a new chip.For your repair bench, the AW87329 is a direct board-level replacement for confirmed audio IC failures on supported boards — not a universal fix for every sound complaint. Rule out a torn speaker mesh, damaged FPC connector, or a software audio profile issue first, since IC replacement won't resolve those. Once you've isolated the fault to this chip through continuity and voltage testing at the input/output pins, this part restores speaker and receiver function to original specification without introducing the noise or distortion issues that come with substituting an unverified equivalent.