MAXREFDES1263 是 TWS（真無(wú)線立體聲）應(yīng)用基礎(chǔ)的參考設(shè)計(jì)。該參考設(shè)計(jì)是 TWS 底座和耳塞（左和右）的電源管理平臺(tái)。它還提供底座和耳塞之間的數(shù)據(jù)通信，其中包括 MAX77651、MAX17270、MAX32660、MAX77818、MAX77813、MAX20340、MAX17260 和 MAX98090。該解決方案展示了一種小尺寸、低功耗、高效、高精度的電源管理系統(tǒng)。在底座方面，MAX77818 集成了高性能 3A 開(kāi)關(guān)充電器和專有的 ModelGauge? m5 電量計(jì)，可提供快速充電和業(yè)界領(lǐng)先的電池電量計(jì)精度。Smart Power Selector? 架構(gòu)包括一個(gè)內(nèi)部開(kāi)關(guān)和控制環(huán)路網(wǎng)絡(luò)，可在 USB、無(wú)線充電、BYP、SYS 和 BATT 之間分配能量。 MAX77813 用于從 Li+ 電池或耳塞充電器的 VSYS 產(chǎn)生穩(wěn)定的 5V 輸出。MAX17270 SIMO 穩(wěn)壓器提供 3.3V 輸出，可編程電壓范圍為 0.8V 至 5.175V，以支持藍(lán)牙?/傳感器模塊或處理器電源。MAX20340 是一款通用雙向電力線通信 (PLC) 管理 IC。它具有從機(jī)檢測(cè)電路，當(dāng) PLC 主機(jī)檢測(cè)到電力線上存在 PLC 從機(jī)時(shí)，該電路會(huì)向系統(tǒng)發(fā)出中斷信號(hào)。耳塞上的從機(jī) MAX20340 可以將數(shù)據(jù)傳輸?shù)降鬃系闹鳈C(jī) MAX20340，例如電池充電狀態(tài)或剩余容量 (mAH) 等信息。MAX32660 用于配置 SIMO、充電器和電量計(jì)以及 PLC (MAX20340)。它還用于讀取電池狀態(tài)和電量計(jì)數(shù)據(jù)。在耳機(jī)上，MAX20340 配置為從機(jī)模式并傳輸?shù)街鳈C(jī)檢測(cè)狀態(tài)。MAX77651B 具有 SIMO 降壓-升壓穩(wěn)壓器，可通過(guò)單個(gè)電感提供三個(gè)獨(dú)立可編程電源軌，以最大限度地減少總解決方案尺寸并支持 MCU、藍(lán)牙/傳感器模塊和其他設(shè)備的電源。150mA LDO 為音頻（音頻編解碼器）和其他噪聲敏感應(yīng)用提供紋波抑制。高度可配置的線性充電器支持各種 Li+ 電池容量，并包括電池溫度監(jiān)控以提高安全性（JEITA）。MAX17260 超低功耗電量計(jì) IC 可監(jiān)控單節(jié)電池組并支持內(nèi)部電流檢測(cè)。MAX32660 用于配置 MAX77651B、MAX17260、MAX20340 和 MAX98090。 MAX98090 提供 I2S 接口引腳，用于連接客戶處理器和麥克風(fēng)輸入以及耳機(jī)輸出，以進(jìn)行音頻功能評(píng)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.