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LM20133: Psi_jc Thermal Characterisation Parameter

Part Number: LM20133

Hi, I am using the LM20133 switcher and, unlike many of the other similar parts, the datasheet is quite sparing in its thermal parameters.  Only theta ja is listed, unless I am being really dumb.  Do you have values for the characterisation parameters (notably psi_jc) for this part?  Many thanks.