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Part Number: TPS61202
I'm using the chip in a power bank design with a single Li-pol battery to drive 5V out for phone charging. It works fine with 20mA LED load (around 5.6V) but smokes the chip and inductor when a phone is connected (high load). I'm not an experienced power designer. Did I do something dumb?
"Do or do not, there is no try." - Yoda
Best RegardsJasper LiBoost Converter Solution
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In reply to Jasper Li:
Thanks for taking a look Jasper. Here's the BOM + layout. I know the layout could be improved - it's a first proto. I'm baffled why a heavy load causes the chip to lock up and smoke the inductor. I'm testing on a bench supply because the safety PCB in my 200mAh Li-pol battery would shut down when the circuit shorted out. It's really tedious to replace the chip - I use a heat gun and low melting point solder paste (Chipquik SMDLTLFP).
In reply to Guy Marsden:
I'm hoping someone (Jasper) can respond to this question. Trying to get this prototype working and tested for pre-production!
What SW pin? And the App note link you gave is bad. You're not being helpful here.
I like the TPS61252 - cleaner and simpler. Here's my updated design. The PCB has a full ground plane under the whole area.
I built the circuit and used a ceramic 47uF cap at C8 per your suggestion. It worked fine driving an adjustable load (USB tester) and I ran it up to 1A input (about .82A output when it started to limit. Using iLim at 10K. SO far, so good. Then I connected the output to a small bluetooth speaker via uUSB to charge it. Input current went to .8A for a few seconds, then the chip blew and shorted the (current limited) power supply I was using to simulate the li-pol battery (set to 3.8V). SO I'm back to square one. This is getting annoying and expensive and my client is getting impatient.
I don't appreciate your taking WEEKS to respond.
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