Tool/software:
Hello,
I am currently making a design for 24V automotive applications. I have a single MCU and transceiver (LIN or CAN) with current consumption like 60-70mA @ 5V.
Since my design is for 24V systems, I can not use LDO because dissipated power is hard to deal with (approximately 1.3W for 24V input 5V output voltage). There are some LDOs in market from other manufactures but they are very close to this power dissipation rating so I do not have enough tolerance I think (up to 1.1-1.2W). Also product must pass standard automotive tests like overvoltage, jump start etc. and these will also force LDO more than average.
So I want to use buck regulator for always on regulator. But I have concerns about life time impact for using buck for always on instead of LDO. Will I encounter with any problem during lifetime of product (5 to 10 years for example) with buck regulator working all the time?
I do not want to use INH pin to close regulator because I have other wake-up inputs connected to MCU that I need to detect which source wakes up the system, so I can not shut down MCU.
Thanks for your help
