Hot!MCP1642B-50I/MS

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Ratendix
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2018/09/13 02:43:08 (permalink)
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MCP1642B-50I/MS

Dear all,
 
I have a problem with my  MCP1642B-50I/MS (fixed 5V output step up regulator).
In our application the step up regulator has an measured regulated output of 3.3 Volt.
Its behaviour is exactly like a 3.3 V regulator. For low input voltages there is a step up output of 3.3 V and for higher input  voltages (like 3.7 V) there is the same output voltage.
However regarding the datasheet there should be an output voltage of 5 Volt. You can trust me there is no short circuit or something similar in our System.
Thanks in Advance!
Christian
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3 Replies Related Threads

    JPortici
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    Re: MCP1642B-50I/MS 2018/09/13 06:42:50 (permalink)
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    seems like you are using the 3.3V part, or the ADJ part but with the feedback resistors set for 3.3V
     
    what is the marking on the actual chip?
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    Ratendix
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    Re: MCP1642B-50I/MS 2018/09/14 01:06:39 (permalink)
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    I am not using any ADJ parts with external resistors..
    The package marking is 42B50I - 442TSO.
    The strange thing is that we have ordered two seperate sample requests from Microchip. And both ICs (ordered as MCP1642B-50I/MS) have the same behaviour...
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    mbrowning
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    Re: MCP1642B-50I/MS 2018/09/14 03:36:58 (permalink)
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    Seems the obvious conclusion is mislabeled devices. You need to talk to Microchip. Support ticket or FAE would be your options.

    The only other possibility is a component or leakage due to pcb contamination or flux injecting current into pin 2, but that can’t be the case as you’ve asked us to trust that there are no such problems.

    Go Navy! Beat Army!
    #4
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