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TPS62737 operating temperature range

Other Parts Discussed in Thread: TPS62737, TPS62736, TPS82740A, TPS62743, TPS62740

Is there a good reason why the specified operating temperature range starts at -20 degrees C, while the sibling TPS62736 starts at -40? Is there a variant of the TPS62737 that is specified for the full industrial range of -40 to 85 degrees C?