Objective
I want to design a tiny single packaged mains-powered temperature sensor. Possibly as a multi-chip module (MCM).
And I checked a lot about the power converter, mainly they are PCB package, and they have very big capacitors in or around. I hope my voltage converter device could be a single chip which can connect sensor chip, so I can pack them on one tiny pcb board which is small and thin, and then add two prongs to plug into the wall.
Constraints
The temperature sensor I plan to incorporate:
- Operates (Iq) between 1VDC, 10mA and 3VDC, 30mA
- It is a 65nm Samgsung fabraction process. So it is very small. I may not design the power source in this 65nm process, but I hope I can design it in CMOS fabraction process.
Power source:
around 110V ~ 220V mains powered (single-phase, actually I am in Korea, and around 220V is enough, if the small range can help me small size my design, around 220V is OK for me. )
Operation without a secondary source (batt, bulk cap, et. al.) desired to minimize size.
The efficiency demanding is just >10% and that is enough for me.
Asks
- What connector strategy would be appropriate for minimum size without compromising safety?
- Which architectural approaches should I consider to minimize the size of the final solution so as to possibly fit the entire solution on a single die?
PS: My final problem is, how can I really avoid those big capacitors, and design it in a small way ? At some point, I really want to design it in a nm process. So I dont need big things. I need some brief and brilliant design ideas.
PSS: Some people help me with some good ideas(thanks for all of them, and I broke some rules here, hope the newbie here wont do it again. and sorry for the community, and some people, I was rude...)