Thursday, January 27, 2022

LM1117 heat problem

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  • #87410
    Cecelia Anne
    Participant

    I use LM1117 as the power output of 3.3V and 5.0V, but the heat is very severe, and the hand is very hot. What is the problem? The 1117 used on the development board that I bought does not cause serious heat problems.

    Reading some related information including its specification and parameter about the LM1117 may help you answer my question more quickly.

    #89957
    Ronie1988
    Moderator

    LM1117 is linear regulator with low drop. However the factors are input voltage and high current. The regulated voltage is output and the the difference of input and regulated voltage is dissipated in form of heat when multiplied with current. Please use heat sink or lower input voltage as per datasheet.

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