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TPS546E25: TPS546E25 VOUT Inquiry

Kian Sang Foo
Prodigy 20 points
Part Number: TPS546E25
Other Parts Discussed in Thread: TPS546D24S

Tool/software:

Hi, 

From the datasheet, VOUT_SCALE_LOOP can be set to 1, VOUT range supported is 0.244V to 0.75V. 

Is this meaning this IC actually can support minimum VOUT = 0.25V instead of 0.4V which mentioned in the first page of the datasheet? 

I need a design which can support VOUT = 0.25V, IOUT = 200A. 

If this IC can support 0.25V at 50A per phase, I can use 4 phase to achieve 200A. 

  • +1
    TI__Guru 56925 points
    Kian Sang Foo said:
    From the datasheet, VOUT_SCALE_LOOP can be set to 1, VOUT range supported is 0.244V to 0.75V. 

    Yes.

    Kian Sang Foo said:
    Is this meaning this IC actually can support minimum VOUT = 0.25V instead of 0.4V which mentioned in the first page of the datasheet? 

    While the output voltage can be programmed through PMBus down to 0.244V, the minimum VBOOT_OFFSET1 voltage is 0.3V and the output voltage automatically returns to VBOOT_OFFSET_1 after a Fault, or when the output is disabled, so supporting a 0.25V application would require VOUT_COMMAND to be written to before the output is enabled each time, including after a fault and before restart if the fault response is programmed for hiccup restart.

    Kian Sang Foo said:
    If this IC can support 0.25V at 50A per phase, I can use 4 phase to achieve 200A. 

    Yes, a 4-phase configuration using 4 TPS546E25 devices can support upto 200A.  See the restrictions above for supporting 0.25V

    While only rated for 40A / phase, you might want to look at the TPS546D24S to support a 0.25V output.  While the pin-programming does not support 0.25V, its VOUT_COMMAND offers NVM backup so that the output voltage will return to 0.25V during power-on by programming VOUT_COMMAND to 0.25V and clearing the VOUT bit of PIN_DETECT_OVERRIDE.