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TPS62202: Can it handle reverse current generated by LSF0108PWR?

ArTzy
Genius 14819 points
Part Number: TPS62202
Other Parts Discussed in Thread: TPS62824A

Hi Experts,

Seeking your assistance on this query:

I am working on a new design and I'm hoping to use certain TI parts. 

I'd like to use level translator LSF0108PWR to translate between 3.3 V & 1.8 V, and I'd also like to generate the 1.8 V supply using the TPS62202DBVR DC-DC converter.

Regarding the LSF family of translators, the TI video tutorial linked below (2:16 mark) says that, "It is very important to note that current will be flowing into the A-side (i.e. 1.8 V) supply during normal operation, and not all voltage sources can sink current.  So be sure that your design can handle this current."

Question:
Can the 1.8 V regulator handle this current? 
https://training.ti.com/tlm-lsf-bias?context=1134826-1139264-1134790

Regards,
Archie A.

  • 0
    TI__Genius 14990 points

    Hi Archie,

    When you want to sink current into the supply, it is required to choose one of our converters that can operate in FPWM mode and has a negative current limit feature. The TPS62202 doesn't have both features.

    You can check one of our newer devices TPS62824A which operates only in FPWM mode and has a negative current limit spec.

    Best regards,

    Varun