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Help to identify a boost converter IC

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    Help to identify a boost converter IC

    Hello guys!
    I am asking for help because I have an Bresser Biolux Touch 5mp microscope with an 4.3 inch tft that has no backlight.I have found that the boost ic that supposed to boost the 5v voltage for backlight is dead.The marking on the ic is : S87BaAA and is a SOT23 6 pin.I cannot find any result googling.I have replaced it with a generic boost converter and the device works,but backlight is always on,I need the datasheet of the original IC to find out how it works...I cannot find any schematics either.Maybe somebody has an idea...
    Thanks!

    #2
    Re: Help to identify a boost converter IC

    It should be a SUNTO STI9287
    Attached Files

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      #3
      Re: Help to identify a boost converter IC

      Yes you are right! Thank you very much!!!
      I don't know how this marking turn into STI 9287 but yes this is it.Maybe you can tell me how you translated this.I have several boost ics eg: Fan 5331,LM 2731 but all have different marking that has no connection to the name of IC
      Anyway thanks very very much!

      PS. Now I see that pin no.4 is Chip Enable Pin(EN/PWM)." Drive EN above 1.5V to turn on the part. Drive EN
      below 0.4V to turn it off. Do not leave EN floating"...
      Last edited by d_ne0; 01-14-2023, 02:39 PM.

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        #4
        Re: Help to identify a boost converter IC

        many times the last letters are date/lot codes, S87 is the device code

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          #5
          Re: Help to identify a boost converter IC

          Thanks very much!

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