LTC4357 100V Application

Hello, 

Is it possible to use LTC4357 for 80V+ voltage oring by ground shifting as shown below?

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  • +1
    •  Analog Employees 
    on Apr 18, 2019 9:40 PM

    Hello ek09,  The above circuit needs to be within the 9V to 80V operating and 100V absolute maximum rating of the LTC4357 but device should also not spend extended time near absolute maximum rating (per Note 1 on datasheet page 3). For example, with V1 input at 0V and Vout = 100V, U1 GND pin will be around 0.7V. Therefore, OUT – GND is close to 100V absolute maximum even under normal operation. For your application, please see Figure 11, 200V Ideal Diode, on page 13 of LTC4359 datasheet.

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  • +1
    •  Analog Employees 
    on Apr 18, 2019 9:40 PM

    Hello ek09,  The above circuit needs to be within the 9V to 80V operating and 100V absolute maximum rating of the LTC4357 but device should also not spend extended time near absolute maximum rating (per Note 1 on datasheet page 3). For example, with V1 input at 0V and Vout = 100V, U1 GND pin will be around 0.7V. Therefore, OUT – GND is close to 100V absolute maximum even under normal operation. For your application, please see Figure 11, 200V Ideal Diode, on page 13 of LTC4359 datasheet.

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