图 1 所示电路板采用 四层印制电路板（PCB）设计（信号 / 电源层 — 接地层 — 接地层 — 信号 / 电源层），保障稳定、低噪声的工作性能。
图 1 经调试与测试的单板方案
该电路搭载欠压锁定保护（UVLO），可防止电池深度放电（深度放电会损坏电池或缩短电池使用寿命）。在单串（1S）电池配置下，若电池电压降至 3.3 伏以下， LTC3115‑1 芯片将触发欠压锁定功能自动关断，实现电池保护。
为防止电池接反损坏电路，电路通过二极管（D3）与保险丝（FUSE1）实现反极性保护。此外，场效应管 Q1、Q4、Q3 的体二极管可进一步防护输入端反向电压，阻断非正常电流导通。
图 2 阶跃响应与瞬态响应分析
该系统经过优化，具备优异的瞬态响应与阶跃响应能力，即使在动态负载条件下也能稳定工作。图 3 展示了 LTC4416 芯片输出端的优先级切换特性：当电压源 V1 从高电压降至 15 伏时，芯片输出在 8 伏时无缝切换至 V2，保证负载输出不受电压变化影响；同时 V1 的恢复阈值设定为 16.8 伏。
图 3 LTC4416 从 V1（15 伏）向 V2（8 伏）的优先级切换（恒定输出负载电压；固定输出电压 = 5 伏，负载电流 = 1 安，电阻 R1=281 千欧，电阻 R3=24.9 千欧）
相关型号
| DigiKey 型号 | 原厂型号 |
|---|---|
| 505-LTC3115EDHD-1#PBF-ND | LTC3115EDHD-1#PBF |
| 505-LTC3115EDHD-1#TRPBFTR-ND,505-LTC3115EDHD-1#TRPBFCT-ND,505-LTC3115EDHD-1#TRPBFDKR-ND | LTC3115EDHD-1#TRPBF |
| LTC3115EFE-1#TRPBFTR-ND,LTC3115EFE-1#TRPBFCT-ND,LTC3115EFE-1#TRPBFDKR-ND | LTC3115EFE-1#TRPBF |
| 505-LTC3115EFE-1#PBF-ND | LTC3115EFE-1#PBF |
| 505-LTC3115IDHD-1#TRPBFTR-ND,505-LTC3115IDHD-1#TRPBFCT-ND,505-LTC3115IDHD-1#TRPBFDKR-ND | LTC3115IDHD-1#TRPBF |
| 505-LTC3115IDHD-1#PBF-ND | LTC3115IDHD-1#PBF |
| 505-LTC3115IFE-1#PBF-ND | LTC3115IFE-1#PBF |
| 505-LTC3115EDHD-2#PBF-ND | LTC3115EDHD-2#PBF |
| 505-LTC3115EFE-2#PBF-ND | LTC3115EFE-2#PBF |
| 505-LTC3115IFE-1#TRPBFTR-ND,505-LTC3115IFE-1#TRPBFCT-ND,505-LTC3115IFE-1#TRPBFDKR-ND | LTC3115IFE-1#TRPBF |
| LTC3115IFE-2#PBF-ND | LTC3115IFE-2#PBF |
| 505-LTC3115HFE-1#PBF-ND | LTC3115HFE-1#PBF |
| 505-LTC3115IDHD-2#PBF-ND | LTC3115IDHD-2#PBF |
| 161-LTC3115MPFE-1#PBF-ND | LTC3115MPFE-1#PBF |
| LTC3115MPFE-2#PBF-ND | LTC3115MPFE-2#PBF |
| 505-LTC3115EDHD-2#TRPBFTR-ND | LTC3115EDHD-2#TRPBF |
| 505-LTC3115HFE-2#PBF-ND | LTC3115HFE-2#PBF |
| 161-LTC3115IDHD-1#WPBF-ND | LTC3115IDHD-1#WPBF |
| 505-LTC3115EFE-2#TRPBFTR-ND | LTC3115EFE-2#TRPBF |
| 161-LTC3115IDHD-1#WTRPBFTR-ND | LTC3115IDHD-1#WTRPBF |
| LTC3115IFE-2#TRPBF-ND | LTC3115IFE-2#TRPBF |
| LTC3115HFE-1#TRPBF-ND | LTC3115HFE-1#TRPBF |
| LTC3115HFE-2#TRPBF-ND | LTC3115HFE-2#TRPBF |
| LTC3115IDHD-2#TRPBF-ND | LTC3115IDHD-2#TRPBF |
| LTC3115MPFE-1#TRPBF-ND | LTC3115MPFE-1#TRPBF |
| 505-LTC4162EUFD-LAD#TRPBFTR-ND,505-LTC4162EUFD-LAD#TRPBFCT-ND,505-LTC4162EUFD-LAD#TRPBFDKR-ND | LTC4162EUFD-LAD#TRPBF |
| 505-LTC4162EUFD-FAD#PBF-ND | LTC4162EUFD-FAD#PBF |
| 505-LTC4162EUFD-LAD#PBF-ND | LTC4162EUFD-LAD#PBF |
| 505-LTC4162EUFD-L42#TRPBFTR-ND,505-LTC4162EUFD-L42#TRPBFCT-ND,505-LTC4162EUFD-L42#TRPBFDKR-ND | LTC4162EUFD-L42#TRPBF |
| 505-LTC4162EUFD-SAD#PBF-ND | LTC4162EUFD-SAD#PBF |
| 505-LTC4162EUFD-SADM#PBF-ND | LTC4162EUFD-SADM#PBF |
| 505-LTC4162EUFD-LADM#PBF-ND | LTC4162EUFD-LADM#PBF |
| 505-LTC4162IUFD-FAD#PBF-ND | LTC4162IUFD-FAD#PBF |
| 505-LTC4162IUFD-SADM#PBF-ND | LTC4162IUFD-SADM#PBF |
| 505-LTC4162IUFD-LAD#PBF-ND | LTC4162IUFD-LAD#PBF |
| 505-LTC4162EUFD-L42#PBF-ND | LTC4162EUFD-L42#PBF |
| 505-LTC4162EUFD-L42M#PBF-ND | LTC4162EUFD-L42M#PBF |
| 505-LTC4162EUFD-L41#PBF-ND | LTC4162EUFD-L41#PBF |
| LTC4162EUFD-SSTM#PBF-ND | LTC4162EUFD-SSTM#PBF |
| LTC4162IUFD-FADM#PBF-ND | LTC4162IUFD-FADM#PBF |
| LTC4162IUFD-SSTM#PBF-ND | LTC4162IUFD-SSTM#PBF |
| LTC4162EUFD-L40#PBF-ND | LTC4162EUFD-L40#PBF |
| LTC4162EUFD-L40M#PBF-ND | LTC4162EUFD-L40M#PBF |
| LTC4162EUFD-FFSM#PBF-ND | LTC4162EUFD-FFSM#PBF |
| LTC4162EUFD-L41M#PBF-ND | LTC4162EUFD-L41M#PBF |
| 505-LTC4162EUFD-FSTM#PBF-ND | LTC4162EUFD-FSTM#PBF |
| LTC4162EUFD-FST#PBF-ND | LTC4162EUFD-FST#PBF |
| LTC4162EUFD-FFS#PBF-ND | LTC4162EUFD-FFS#PBF |
| LTC4162IUFD-SST#PBF-ND | LTC4162IUFD-SST#PBF |
| 505-LTC4162IUFD-L42#PBF-ND | LTC4162IUFD-L42#PBF |
| LTC4162IUFD-L40#PBF-ND | LTC4162IUFD-L40#PBF |
| LTC4162IUFD-L40M#PBF-ND | LTC4162IUFD-L40M#PBF |
| LTC4162IUFD-FFSM#PBF-ND | LTC4162IUFD-FFSM#PBF |
| LTC4162IUFD-L41M#PBF-ND | LTC4162IUFD-L41M#PBF |
| 505-LTC4162IUFD-L41#PBF-ND | LTC4162IUFD-L41#PBF |
| LTC4162IUFD-FSTM#PBF-ND | LTC4162IUFD-FSTM#PBF |
| 505-LTC4162IUFD-L42M#PBF-ND | LTC4162IUFD-L42M#PBF |
| LTC4162IUFD-FFS#PBF-ND | LTC4162IUFD-FFS#PBF |
| 505-LTC4162IUFD-LAD#TRPBFTR-ND | LTC4162IUFD-LAD#TRPBF |
| 505-LTC4162EUFD-FADM#TRPBFTR-ND,505-LTC4162EUFD-FADM#TRPBFCT-ND,505-LTC4162EUFD-FADM#TRPBFDKR-ND | LTC4162EUFD-FADM#TRPBF |
| 505-LTC4162IUFD-SAD#PBF-ND | LTC4162IUFD-SAD#PBF |
| 505-LTC4162IUFD-LADM#PBF-ND | LTC4162IUFD-LADM#PBF |
| LTC4162IUFD-FST#PBF-ND | LTC4162IUFD-FST#PBF |
| LTC4162EUFD-FADM#PBF-ND | LTC4162EUFD-FADM#PBF |
| LTC4162EUFD-SST#PBF-ND | LTC4162EUFD-SST#PBF |
| LTC4162EUFD-FAD#TRPBF-ND | LTC4162EUFD-FAD#TRPBF |
| LTC4162EUFD-FFS#TRPBF-ND | LTC4162EUFD-FFS#TRPBF |
| LTC4162EUFD-FFSM#TRPBF-ND | LTC4162EUFD-FFSM#TRPBF |
| LTC4162EUFD-FST#TRPBF-ND | LTC4162EUFD-FST#TRPBF |
| LTC4162EUFD-FSTM#TRPBF-ND | LTC4162EUFD-FSTM#TRPBF |
| LTC4162EUFD-L40#TRPBF-ND | LTC4162EUFD-L40#TRPBF |
| LTC4162EUFD-L40M#TRPBF-ND | LTC4162EUFD-L40M#TRPBF |
| LTC4162EUFD-L41#TRPBF-ND | LTC4162EUFD-L41#TRPBF |
| LTC4162EUFD-L41M#TRPBF-ND | LTC4162EUFD-L41M#TRPBF |
| LTC4162EUFD-L42M#TRPBF-ND | LTC4162EUFD-L42M#TRPBF |
| LTC4162EUFD-LADM#TRPBF-ND | LTC4162EUFD-LADM#TRPBF |
| LTC4162EUFD-SAD#TRPBF-ND | LTC4162EUFD-SAD#TRPBF |
| LTC4162EUFD-SADM#TRPBF-ND | LTC4162EUFD-SADM#TRPBF |
| LTC4162EUFD-SST#TRPBF-ND | LTC4162EUFD-SST#TRPBF |
| LTC4162EUFD-SSTM#TRPBF-ND | LTC4162EUFD-SSTM#TRPBF |
| LTC4162IUFD-FAD#TRPBF-ND | LTC4162IUFD-FAD#TRPBF |
| LTC4162IUFD-FADM#TRPBF-ND | LTC4162IUFD-FADM#TRPBF |
| LTC4162IUFD-FFS#TRPBF-ND | LTC4162IUFD-FFS#TRPBF |
| LTC4162IUFD-FFSM#TRPBF-ND | LTC4162IUFD-FFSM#TRPBF |
| LTC4162IUFD-FST#TRPBF-ND | LTC4162IUFD-FST#TRPBF |
| LTC4162IUFD-FSTM#TRPBF-ND | LTC4162IUFD-FSTM#TRPBF |
| LTC4162IUFD-L40#TRPBF-ND | LTC4162IUFD-L40#TRPBF |
| LTC4162IUFD-L40M#TRPBF-ND | LTC4162IUFD-L40M#TRPBF |
| LTC4162IUFD-L41#TRPBF-ND | LTC4162IUFD-L41#TRPBF |
| LTC4162IUFD-L41M#TRPBF-ND | LTC4162IUFD-L41M#TRPBF |
| LTC4162IUFD-L42#TRPBF-ND | LTC4162IUFD-L42#TRPBF |
| LTC4162IUFD-L42M#TRPBF-ND | LTC4162IUFD-L42M#TRPBF |
| LTC4162IUFD-LADM#TRPBF-ND | LTC4162IUFD-LADM#TRPBF |
| LTC4162IUFD-SAD#TRPBF-ND | LTC4162IUFD-SAD#TRPBF |
| LTC4162IUFD-SADM#TRPBF-ND | LTC4162IUFD-SADM#TRPBF |
| LTC4162IUFD-SST#TRPBF-ND | LTC4162IUFD-SST#TRPBF |
| LTC4162IUFD-SSTM#TRPBF-ND | LTC4162IUFD-SSTM#TRPBF |
| 505-LTC4416EMS-1#PBF-ND | LTC4416EMS-1#PBF |
| 505-LTC4416EMS#TRPBFTR-ND,505-LTC4416EMS#TRPBFCT-ND,505-LTC4416EMS#TRPBFDKR-ND | LTC4416EMS#TRPBF |
| 505-LTC4416EMS#PBF-ND | LTC4416EMS#PBF |
| 505-LTC4416IMS#PBF-ND | LTC4416IMS#PBF |
| 505-LTC4416IMS-1#PBF-ND | LTC4416IMS-1#PBF |
| 505-LTC4416IMS#TRPBFTR-ND,505-LTC4416IMS#TRPBFCT-ND,505-LTC4416IMS#TRPBFDKR-ND | LTC4416IMS#TRPBF |
| LTC4416EMS-1#TRPBFTR-ND,LTC4416EMS-1#TRPBFCT-ND,LTC4416EMS-1#TRPBFDKR-ND | LTC4416EMS-1#TRPBF |
| 505-LTC4416IMS-1#TRPBFTR-ND | LTC4416IMS-1#TRPBF |
| 161-LTC4416IMS-1-ND | LTC4416IMS-1 |
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