Other Parts Discussed in Thread: LM4132
I have a specific question regarding LM4132CQ1MFR3.0. In a design we can not always guarantee the LM4132 is supplied correctly or supplied at all, whereas the rest of the circuit might operate. The following two conditions can happen:
1) Complete loss of power supply. Voltage present at the output but not higher than the max ratings. The question is how does the part behave? We will see a leakage current through the feedback divider, What is the max current we have to assume? Also does the transistor block or will there be some leakage path through the bipolar transistor as well and what current / behavior do we expect here? Is there an ESD Structure which does start conducting?
2) Vin can be as low as 2,9V. I understand that the REF can not regulate anymore. It is assumed the Vout tracks Vin with a Vdrop. Firstly at 2,9V does the part still operate as described? Secondly what will be the voltage drop from Vin to Vout be at 2,9V supply?