We are using the TPS40305 to regulate from a input voltage of 19V down to 12V. We have started having a number of returns due to failure of the TPS40305.
Our investigations have found to have a damaged internal BP diode on the TPS40305 IC, resulting in insufficient gate drive voltage to turn the high side mosfet on. This was proved by placing an external diode in parallel with the TPS40305 internal BP diode, resulting in the regulator operating correctly.
The TPS40305 is dynamically enable/disabled via the EN/SS_STARTER pin been pulled low via an open collector circuit.
Is there a TI support contact we can use to send through our schematic for advice to help is to figure why the BP diode is failing in the TPS40305.