EEVblog Electronics Community Forum
Electronics => Beginners => Topic started by: papa_lazerous on June 03, 2019, 11:23:34 am
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HI all,
I have been working on a project that I am using a TP4056 to charge a single 18650 cell, and it all works except the TP4056 gets too hot and fails after some time, the reason is I didn't include a thermal pad in Kicad to take the heat away from the die my fault as I designed the board before I had the chip in front of me and used the wrong footprint.
Now I am redesigning my board layout and will put a pad below the chip and some vias to get some of the heat away from the chip. I cannot find any information on what I should connect to the pad to electrically. I used a multimeter on continuity and the pad on the bottom of the chip is not connected to any of the pins on the chip. That said I was going to connect it to the GND plane as that is the largest copper fill I have on the board.
I would be very appreciative of any advice on this, the link to the datasheet is below. However it leaves allot of information out imho
https://dlnmh9ip6v2uc.cloudfront.net/datasheets/Prototyping/TP4056.pdf
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The datasheet states "Available Radiator in 8-Lead SOP Package,the Radiator need connect GND or impending". "Impending" appears to be a bad translation, and might have meant "isolated" but it seems pretty clear that the pad can be safely connected to ground.
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Thanks I will connect it to GND, a second set of eyes definitely helped as I looked over the datasheet multiple times and glossed right over that bit |O