what's the relationship between the output current limit and input current limit of LTM8055?

"The maximum output current depends upon the input voltage. Higher input voltages yield higher maximum output current."

why? just because of the more input power with higher Vin?

the largest output current is 8.5A, so what's the largest input current of the module? is still 8.5A?

"Bear in mind that the maximum output current is limited by junction temperature, the relationship between the input and output voltage magnitude and other factors."

how can I design the current limit with the voltages not listed on the datasheet's graphs? like Vin=9V, Vout=10V, Iout=7.5A.

is there any formulas to calculate this precisely? 

thanks!

all the conditions I mentioned above regardless of  the CTL, Rsense, etc.

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  • Hi Shawn
    The current is limited by the internal components ability to handle the current when operating in lower input voltages.
    At lower input voltages more specifically when the converter is operating at boost mode (Higher Vout than Vin) the inductor would need to handle higher current peaks to maintain a certain output load compared when it is operating in buck mode (Higher Vin than Vout).
    To aid you in your design, Please download and install LTPowerCAD vII. After installation just search for LTM8055 and enter your design parameters.
    Link for LTpowerCAD vII:
    www.analog.com/.../ltpowercad.html
    Regards,
    Mikee
Reply
  • Hi Shawn
    The current is limited by the internal components ability to handle the current when operating in lower input voltages.
    At lower input voltages more specifically when the converter is operating at boost mode (Higher Vout than Vin) the inductor would need to handle higher current peaks to maintain a certain output load compared when it is operating in buck mode (Higher Vin than Vout).
    To aid you in your design, Please download and install LTPowerCAD vII. After installation just search for LTM8055 and enter your design parameters.
    Link for LTpowerCAD vII:
    www.analog.com/.../ltpowercad.html
    Regards,
    Mikee
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