MAXREFDES1263 是 TWS（真无线立体声）应用基础的参考设计。该参考设计是 TWS 底座和耳塞（左和右）的电源管理平台。它还提供底座和耳塞之间的数据通信，其中包括 MAX77651、MAX17270、MAX32660、MAX77818、MAX77813、MAX20340、MAX17260 和 MAX98090。该解决方案展示了一种小尺寸、低功耗、高效、高精度的电源管理系统。在底座方面，MAX77818 集成了高性能 3A 开关充电器和专有的 ModelGauge™ m5 电量计，可提供快速充电和业界领先的电池电量计精度。Smart Power Selector™ 架构包括一个内部开关和控制环路网络，可在 USB、无线充电、BYP、SYS 和 BATT 之间分配能量。 MAX77813 用于从 Li+ 电池或耳塞充电器的 VSYS 产生稳定的 5V 输出。MAX17270 SIMO 稳压器提供 3.3V 输出，可编程电压范围为 0.8V 至 5.175V，以支持蓝牙®/传感器模块或处理器电源。MAX20340 是一款通用双向电力线通信 (PLC) 管理 IC。它具有从机检测电路，当 PLC 主机检测到电力线上存在 PLC 从机时，该电路会向系统发出中断信号。耳塞上的从机 MAX20340 可以将数据传输到底座上的主机 MAX20340，例如电池充电状态或剩余容量 (mAH) 等信息。MAX32660 用于配置 SIMO、充电器和电量计以及 PLC (MAX20340)。它还用于读取电池状态和电量计数据。在耳机上，MAX20340 配置为从机模式并传输到主机检测状态。MAX77651B 具有 SIMO 降压-升压稳压器，可通过单个电感提供三个独立可编程电源轨，以最大限度地减少总解决方案尺寸并支持 MCU、蓝牙/传感器模块和其他设备的电源。150mA LDO 为音频（音频编解码器）和其他噪声敏感应用提供纹波抑制。高度可配置的线性充电器支持各种 Li+ 电池容量，并包括电池温度监控以提高安全性（JEITA）。MAX17260 超低功耗电量计 IC 可监控单节电池组并支持内部电流检测。MAX32660 用于配置 MAX77651B、MAX17260、MAX20340 和 MAX98090。 MAX98090 提供 I2S 接口引脚，用于连接客户处理器和麦克风输入以及耳机输出，以进行音频功能评估。

The MAXREFDES1263 is a reference design for the TWS (True Wireless Stereo) application base. This reference design is a power management platform for TWS cradle and earbuds (left and right). It also supplies data communication between the cradle and earbuds, which includes the MAX77651,MAX17270,MAX32660, MAX77818, MAX77813, MAX20340, MAX17260, and MAX98090. This solution demonstrates a small-size, low-power, highly effective, high-accuracy power management system.

On the cradle side, the MAX77818 integrates a high-performance 3A switching charger and proprietary ModelGauge™ m5 fuel gauge, which provides fast charging and industry-leading battery fuel-gauge accuracy. The Smart Power Selector™ architecture includes a network of internal switches and control loops that distributes energy among USB, wireless charging, BYP, SYS, and BATT. The MAX77813 is used to produce stable 5V output from a Li+ battery or VSYS from the earbud charger. The MAX17270 SIMO regulator provides 3.3V outputs with 0.8V to 5.175V programmable voltage range to support a Bluetooth®/sensor module or processor power supply. The MAX20340 is a universal bidirectional powerline communication (PLC) management IC. It features a slave detection circuit that flags an interrupt to the system when the PLC master detects the presence of a PLC slave on the power line. The slave MAX20340 on the earbuds can transmit data to the master MAX20340 on cradle, like battery charging status or information such as remaining capacity (mAH), etc. The MAX32660 is used to configure the SIMO, charger and fuel gauge, and PLC (MAX20340). It also is used to read the battery status and fuel gauge data.

On the earbuds, the MAX20340 is configured in slave mode and transfers to the master detection state. The MAX77651B features a SIMO buck-boost regulator that provides three independently programmable power rails from a single inductor to minimize total solution size and to support the MCU, Bluetooth/sensor module, and other devices’ power supplies. A 150mA LDO provides ripple rejection for audio (audio CODEC) and other noise-sensitive applications. A highly configurable linear charger supports a wide range of Li+ battery capacities and includes battery temperature monitoring for additional safety (JEITA). The MAX17260 ultra-low-power fuel-gauge IC monitors a single-cell battery pack and supports internal current sensing. The MAX32660 is used to configure the MAX77651B, MAX17260, MAX20340, and MAX98090. The MAX98090 provides I2S interface pins to connect customer processor and microphone inputs along with headphone outputs for audio function evaluation.