Failed car USB charger teardown

Here is teardown of one cheap car USB charger. It failed after few years of use.




As you can see the fail was in soldering that connected two circuit boards. The fail had ripped of solder pads from circuit board.

The soldering quality on some other places also questionable.

There is simple swich mode power regulator built using AD85063S chip that has run quit hot. AD85063D Datasheet page has this circuit diagram that look quite close to what this adapter uses:


There were 1A and 2.1A outputs. They are connected to same power supply, the only difference between them was how data lines are terminated.

There are not any fuse in this circuit.

End result: not worth to repair. Replace with better one. According to one review it is a good idea to avoid this kind of AD85063 based adapter.

1 Comment

  1. Tomi Engdahl says:

    Inside a Pound shop car-USB charger (with schematic)

    I’ll warn you in advance, that if you want more from a USB charger than a measly 500mA then this one isn’t for you. It might have uses for powering low current devices though.

    This came from a generic pound shop as opposed to one of the higher profile ones like Poundland. Now I want to get a recent Poundland car-USB charger and compare them.

    The one good thing about this charger is that it shows how minimalist the circuitry can be in a mass produced device when they can justify using a dedicated buck converter chip.


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