折腾了：
后来参考：
两款爆品迷你智能音箱拆解对比：天猫精灵方糖、小爱mini-天猫精灵,方糖,小爱,小爱mini,迷你,智能音箱,拆解 ——快科技(原驱动之家)–全球最新科技资讯专业发布平台
的解释：
NXP TFA9895 D类音频放大器。右侧为升压电感，在低压供电时提供足够的输出功率。
-》看来是我搞错了。
再去找找：
T9895
HNU459
5D7021
T9895 nxp
天猫精灵方糖 AI智能音箱（拆解+还原+简评）|拆机乐园 – 数码之家 – 第12页
“T9895, 就是NXP 的TFA9895, 在3.6V的时候4Ohm负载输出功率有2.56W, 本身就是带DAC的数字Class-D功放. 输入信号为I2S.”
T9895 NXP Semiconductors, T9895 In-Stock, T9895 Specifications – Worldway Electronics
Part Number: T9895
Manufacturer: NXP Semiconductors
http://www.alldatasheet.net/view.jsp?Searchword=T9895
TFA9895 Stock and Price by Distributor
TFA9895BUK/N1Z NXP USA Inc. | 集成电路（IC） | DigiKey
【总结】
芯片：NXP TFA9895
类型：Audio Amplifier IC 音频功放芯片
作用：增强音频功率
综述：
增强型D类音频放大器，且具备扬声器升压保护和多频段动态范围压缩器
TFA9895是一款高效D类音频放大器，具有先进的扬声器升压保护算法，具有多频段压缩功能。它可以在电池电压为3.6 V下，为扬声器提供2.65 W（RMS; THD = 1％）输出功率。内部升压转换器将电源电压提升至5.3 V，为音质的重大改进提供充足的空间。
更详细的技术细节：
（1）Typical mono application (simplified)
（2）Typical stereo application (simplified)
（3）Typical mono application with two audio sources and a second I2S slave device
还是去：
【整理】什么是Audio Amplifier IC音频功放芯片和Audio Pre-Amplified IC
【后记】
在：
后，再去找找看
但是有点看不清
T9895
HNU459
5D7021
借助于google图片搜索，再去搜索：
T9895
搜到一些：
TFA9895
NXP_mobile audio chip _introduce at seoul(7) | IT Eco Map & News Navigator
-》NXP mobile audio chip
Buy T9895 Audio Amplifier IC BGA Chip online | eBay
Speaker boost IC aims to improve sound quality in smartphones | Smart2.0
NXP has extended its range of speaker driver ICs with the TFA9895 – its second-generation speaker boost solution – which improves the sound quality of handsets and tablets via a new multi-band compression feature which enhances the way music and voice sound, even at louder speaker volumes.
The multi-band processing feature in the TFA9895 improves audio quality at louder speaker volumes via more stable high-gain audio imaging. The TFA9895 also adds a high-frequency noise gate that improves the sound of poor-quality audio signals. Like its predecessor, the TFA9887, the TFA9895 offers a completely integrated small speaker driver, including integrated processing and an on-board 5-V DC/DC converter, as well as complete protection against speaker failure. Both ICs can deliver 4W of peak power into a 4-Ohm speaker that is conventionally limited to 0.5W.
HNU459
HMU459
HMU459 audio
HMU459 nxp
5D7021
5D7021 audio
507021 audio
5D7021 nxp
都搜不到
-》看来此处从marking的：
HNU459
5D7021
还是搜不到原始芯片的part number的
（也可能是由于文字看不清导致的）
不过倒是从：
T9895
可以搜到：部分文章是能说明是：
NXP TFA9895
的。
转载请注明：在路上 » 【整理】音频功放芯片：NXP TFA9895