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TPS63036: using TPS63036 as TEC controller, TIDA-050017

Part Number: TPS63036
Other Parts Discussed in Thread: TIDA-050017, TPS63802

I'm investigating  using the TPS63036 as a TEC controller  as described in Ti design guide TIDA-050017 .

the design guide uses the TPS63802.   I've changed to the TPS63036 for smaller footprint size. 

In testing using the TPS63036 EVM board  I see good performance when the 63036 is sourcing current  -   Vout = 5.2V,  load = 4ohm  (simulating TEC),  other side of load = 3.3V

But when sinking current -  Vout = 1.5V (can't go lower)  ,  other side of simulated TEC  is 3.3V.     the minimum  load I can do is ~10ohms  and probably that is already too low.   In sinking current the max current appears to be less than 200mA across the load.

Is this expected?   Is there a significant difference between the TPS63802 and 63036 that would account for reduced  sink performance?     the design guide mentions there is a difference between sink/source performance so want to verify what I could expect.