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Output current with TPS54525 @0.825

Andrew Goodney
Prodigy 20 points

I've designed a small board with a TPS54525PWP to supply ~0.8V core voltage to an IC. I would like the supply to deliver 4-5A, however when I set the resistor divider for the supply to 0.8V the maximum current I observe is around 2A. I do this with a very small resistor as a load.

However, if I change the resistor divider to set the output to 1.5V then I can observe >4.5A, however the supply does drop about 300mV down to 1.2V.

Any thoughts on what could cause this? I've attached a schematic and board layout snippet.

TPS54525_sch_layout.pdf
  • 0
    TI__Guru**** 191445 points

    I've done a lot of designs with low output voltages and not observed any issues.  With very low output such as 0.8 V, you may approach the minimum on time for the converter.  It is after hours now, and I may not get a detailed look at your design until tomorrow.