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Q: TPS62150 UVLO and Hysteresis Specs? by 1879511
The UVLO threshold on the TPS62150 is specified as input voltage falling at 2.8V (max).
The hysteresis is specified as 200mV (typical only).
Furthermore, the electrical characteristics table specs are guaranteed up to 85degC ambient (not necessarily 125C junction).
Question 1: Do we have any max UVLO hysteresis data available?
The 2.8V max UVLO falling threshold + the typical 200mV hysteresis is right at the 3V minimum VIN, but the hysteresis spec is not guaranteed.
Question 2: Do we have data for 125C junction temperature (as opposed to specifying 85C ambient)?
A: Re: TPS62150 UVLO and Hysteresis Specs? by 1090425
The maximum value for the rising threshold is specified in the first line of the electrical characteristics table--the IC operates from a 3V to 17V input source. So, it is specified to operate at 3V--the rising threshold cannot be above this level.
Regarding the temperature range, the IC should be operated within the recommended operating conditions. This includes an ambient temperature of -40 to 85. When the IC is off (disabled), there is no power loss in it. So, Tj = Ta. Thus, the rising threshold for the UVLO would only need to be tested over the ambient temperature range.
Almost all of the datasheet parameters are characterized and specified over the junction temperature range (up to 125). This is the case for the UVLO also. The test data shows no difference in the threshold at 85 or 125 C. The ambient temperature range is listed as a legacy holdover as well as for parameters that are only relevant when there is no power dissipation in the IC (Tj = Ta), such as Iq, I shutdown, etc.
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