Tool/software:
Hi,
I use TI IC TLV62569ADRLR for my power conversion circuit, which is from 5V to 3.8V for the IOT application. But, this IC is continuously blowing up and damaging my BMS. I am giving it 5V from my BMS. I am attaching the circuit diagram that I am using. I am using it to supply my SIMCOM module A7672S whose working voltage is 3.8V.
Hello Abhishek,
thanks for reaching out in E2E.
In your schematic I noticed a quite huge capacitance at the output, which is not recommended. 22uF to 47uF output cap is recommended and might cause instability. You could check VOUT for stability.
However, I would primarily suspect some voltage over-stress at VIN. Even short spikes can damage the device.
Does the TLV62569A burn immediately after power-up or after a while?
I would suggest to monitor the VIN pin to GND pin voltage during startup, operation and shut-down and check for over-voltage pulses.
Is there a long trace between 5V supply and the TLV62569A? Its parasitic inductance could cause some resonance voltage peak at VIN. In this case you could add a bigger tantalum cap, which usually has some higher ESR to damp the resonance.
Please let me know your feedback.
Best regards,
Andreas.