▓How to increase the amperage of the tp4056 module to 3A?▓

electronium said:

Greetings to the colleagues of the forum
If we want to get a higher amp from a single tp4056 module, for example, what circuit should we add to the module, can we? How is the circuit and its schematic?

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carbonzit said:

I'm not disputing anything you wrote, but just want to ask: looking at the datasheet for this chip, wouldn't it be possible to add a pass transistor (BJT or MOSFET) at the chip's BAT terminal to increase the current capacity as the OP asked about?

This all above my pay grade, so pardon me if this is an absurd question ...

Totally agree about Battery University as a great source of info for anything battery-related.

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carbonzit said:

wouldn't it be possible to add a pass transistor (BJT or MOSFET) at the chip's BAT terminal to increase the current capacity as the OP asked about?

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rjenkinsgb said:

That would pretty much disable both charging and cell protection.

The BAT terminal is the (extremely critical) voltage sense point, that the IC uses to control & limit the charge voltage and protect the cell.

If you add any external components that cause voltage drop (like a transistor base-emitter junction, the charging voltage at the cell will not be read correctly.

In that simple example, the charge would cut off at around 3.6V on the cell (4.2 - 0.6V) so it basically never charges.

The current sensing is also internal to the IC, so the charge current control and limiting would be disabled, if any current passes through an external device.

It would also break the cell undervoltage current limiting, that prevents a failed cell that has developed internal leakage, from being forced to charge. It could cause a faulty cell to burst or catch fire.

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