LTC4126

ADI可穿戴設(shè)備的理想伴侶——無線鋰離子充電器解決方案
高效無線輸入功率控制器
可穿戴設(shè)備越來越傾向于使用無線電池充電，無需使用電纜或外露連接器，因此改善了用戶體驗。LTC4126充電
器、DC-DC轉(zhuǎn)換器具有一個無線功率控制器，使其能夠從發(fā)射線圈產(chǎn)生的交流磁場無線接收功率（如LTC699 0解決方
案）。無線功率控制器將接收器端諧振電路的交流電壓整流成VCC引腳的直流電壓。此直流電壓饋入線性充電器，線
性充電器再調(diào)節(jié)對電池的充電。
LTC4126接收的能量超出所需能量，無線功率控制器通過將接收器諧振電路分流接地來調(diào)節(jié)線性充電器的輸入VC
C。這樣，線性充電器將高效運行，因為其輸入正好保持在電池電壓VBAT之上。接合分流電路時，諧振電路也會接收
較少的功率，因為諧振頻率與發(fā)射器頻率失調(diào)。


全功能線性電池充電器
LTC4126中的集成式恒流(CC)/恒壓(CV)線性鋰離子電池充電器可通過一組完整的保護功能確保充電周期正常運行
,包括安全計時器的自動充電和自動終止、不良電池檢測和超出溫度范圍充電暫停功能。LTC4126包括可傳遞至系統(tǒng)微
控制器的充電器狀態(tài)和電池電壓電平信號。


無電感低噪聲DC-DC轉(zhuǎn)換器
LTC4126包括一個整體式無電感充電泵DC-DC轉(zhuǎn)換器，通過電池調(diào)節(jié)系統(tǒng)負載輸出。LTC4126的DC-DC轉(zhuǎn)換器可通過
其EN引腳開關(guān)，從而允許通過微處理器進行控制。EN引腳也可與LTC4126的 PBEN引腳配合使用，以實現(xiàn)按鈕控制——無
需額外的去抖電路。
充電泵DC-DC轉(zhuǎn)換器具有三種操作模式，具體取決于電池電壓，以提高整體效率。

結(jié)論
LTC4126是受到良好保護、高度集成、極其緊湊的無線充電器接收器解決方案，是可穿戴設(shè)備的理想選擇。將LTC
4126（可穿戴設(shè)備端）與基于LTC6990（充電站端）的ZVS單晶體管發(fā)射器組合在一起，可輕松實現(xiàn)完整的無線充電解決
方案，基于這些設(shè)備的完整解決方案具有低功耗和低成本。


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