| ??? 08/02/13 02:30 Modified: 08/02/13 02:43 Read: times Msg Score: +1 +1 Good Answer/Helpful |
#189993 - Try Logic level power FETS Responding to: ???'s previous message |
Erik Malund said:
.. but what else but ludditeism requires 5V Vcc Err, do you never use Logic level power FETS, of the Milli-Ohm kind ? Plenty of other designers do. Your 3v3 (or 1.8V) fails abysmally at driving one of those, and the fix of 'just add more parts' simply (again) proves my point. Even in the subset of cases, where an added pullup might 'get by', on a '5V tolerant' device, you then hit this fish-hook : Absolute Maximum Ratings: [VDD < 3.3 V] : VIN <= (VDD+2.5) Yes, that '5V tolerant' is only really universally 2.5V tolerant, and now power cycling matters. |
| Topic | Author | Date |
| New SiLabs F85x/6x | 01/01/70 00:00 | |
| A good addition | 01/01/70 00:00 | |
| you may, as well, get used to 3V3 | 01/01/70 00:00 | |
| 1.8-5.5V :: is the new game in town. | 01/01/70 00:00 | |
| if i need a 3V3 chip .... | 01/01/70 00:00 | |
| Try Logic level power FETS | 01/01/70 00:00 | |
| USB 5V | 01/01/70 00:00 | |
| .. or multiple onboard regulators | 01/01/70 00:00 | |
lots of chips these days have that | 01/01/70 00:00 |