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TI 有没像 凌特 LTC4412 那样的，备用电源切换芯片？
主电源 12V 的工作电压，电流小于 2A
备用电池 8V 供电
LTC4412 pdf
http://cds.linear.com/docs/en/datasheet/4412fa.pdf
TPS2412或TPS2413
