Hi, I have tried using tps63021 3v3 buck boost converter to power up a GPS chip. I have managed to make the gps board working and got all the necessary satellite signals, and it is working fine as well.
Everthings seems to go well until we decided to manually turn the tps63021 chip on and off using the enable pin, just to safe some power. Since that, I have noticed that after random count of attempts (could be 20 times, 40times, 100 times) of turning on and off the regulator chip, the regulator will stop to work, the output voltage will stay at 0.78V even when the enable pin is high and the Vin is high. The connection of the circuit is as the standard supplied schematics apart from that I have used quite a big reservoir and output capacitor.I have noticed that if I unplug the power cable to the regulator and plug it in again, the circuit will work again and start failing after certain amount of random attempts again.
Please could someone advise why is it failing after random attempts and how do I fix it? The circuit is part of a main circuit which consist of gsm, rfid and other module, I was thinking it could either be power or noise. But I think the noise is the higher chances of why the circuit is not working since it is powered by a big Lithium battery. Could transient noise cause failure of the regulator chip to startup properly?
Thank you.
