Meaning of datasheet items and Operating LT1175

I have some questions about "LT1175C".

1. What does "junction temperature" mean in page 2 of the datasheet?


2. In particular, the maximum junction temperature seems to be the maximum allowed temperature, so what does the minimum junction temperature value mean?


3. Can I operate the LT1175C (not the LT1175i) at an ambient temperature of -32 degrees Celsius?

4. What happens when the LT1175C is operating at an ambient temperature of -32 degrees Celsius?
Does not work? Or does the voltage output change or shake? Or is lifetime reduced?

Parents
  • The junction temperature is the temperature inside of the IC. It can be estimated as Ta(ambient temperature)+Power Loss*Thermal  resistance.  For LT1175C, the junction temperature range is 0-125C, which means the highest temperature is 125C and the lowest temperature is 0C.  The LT1175C is 100% production tested at TA = 25°C. Performance at 0°C and 125°C is assured by design, characterization and correlation with statistical process controls. In short, the part may work properly but it is not guaranteed. I would recommend to use I-grade if the part runs at -32C.

Reply
  • The junction temperature is the temperature inside of the IC. It can be estimated as Ta(ambient temperature)+Power Loss*Thermal  resistance.  For LT1175C, the junction temperature range is 0-125C, which means the highest temperature is 125C and the lowest temperature is 0C.  The LT1175C is 100% production tested at TA = 25°C. Performance at 0°C and 125°C is assured by design, characterization and correlation with statistical process controls. In short, the part may work properly but it is not guaranteed. I would recommend to use I-grade if the part runs at -32C.

Children
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