Identifying a DC/DC step down converter

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    MT3608 Step-Up Converter IC Datasheet
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    The MT3608 is a constant frequency, 6-pin SOT23 current mode step-up converter intended for small, low power applications. The MT3608 switches at 1.2MHz and allows the use of tiny, low cost capacitors and inductors 2mm or less in height.

    Internal soft-start results in small inrush current and extends battery life.

    The MT3608 features automatic shifting to pulse frequency modulation mode at light loads. The MT3608 includes under-voltage lockout, current limiting, and thermal overload protection to prevent damage in the event of an output overload. The MT3608 is available...
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  • DriversScrew
    Need help to identify SOT23-5 step-down converter to 3.3V marking E16q9
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    Hello everybody,
    I need to replace a shorted SOT23-5 step down converter in a consumer audio device marking E16q9. What I found out from the board layout and measurements:

    Vin: 5,0V
    Vout: 3,3V (connecting to all 3V3 inputs of a N32905U3DN)
    Pin1: ? (perhaps enable)
    Pin2: GND
    Pin3: Vout - connected to 3ยต3 coil
    Pin4: Vin
    Pin5: Feedback, voltage divider, two resistors connect Vout-Pin5-GND, 680k+133k

    I searched many datasheets, but no one seemed to match according the surrounding components.
    Best similar parts I found were...
    12-21-2023, 07:06 AM
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    Hi all!

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  • bohaboha
    brand new buck converter does not step up or down
    by bohaboha
    To test I plug in a 12v source and try by plugging a multimeter on the output and turning on the blue trim potentiometer it's fix at 12v however I turn it up or down what could be wrong ?...
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    What is this PSW1 part on a circuit board? Trying to fix a Canopus ADVC-300 DV/VHS Converter
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    I'm trying to fix this Canopus converter so that I can convert lots of old VHS cassettes. The problem is that it turns on for a split (and I mean split!) second, the fan jerks and then.. nothing. I've checked the power brick works. I've opened up the converter itself and been testing for shorts.



    The image attached shows the on/off switch (which I've checked works) to the left of the yellow socket. Below the yellow socket is a green block marked 26 with a strange symbol at the front. Putting my probes either end of this block, on the silver parts, gives an open short...
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