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TPS1663: Startup

Part Number: TPS1663

Hi,

According to the datasheet for the TPS1663, the eFuse turns on when the nSHDN signal is HIGH. However, in my design, the TPS1663 eFuse is in between the power supply and the MCU (which is powered by the power supply), and the MCU is what sends a HIGH signal to the nSHDN pin to turn on the eFuse. So my question is, will my system turn on at all? My thinking is that when the power supply is turned on, the eFuse will remain an open circuit, which will prevent power from reaching the MCU, which then cannot send a signal to the eFuse to turn it on. This seems to be kind of a chicken and egg problem, and I'd appreciate clarification. Thanks!

  • Hi Lorenzo,

    SHDN/ pin is intended to control the device remotely and not from its own downstream power. If that is the requirement, you may need additional power path from power supply (LDO + protection circuit) to the MCU to provide the flexibility for controlling TPS1663

    Best Regards, Rakesh