So I was working on building myself a new serial gateway tonight when I realized that I am out of 3.3v TO-92 package regulators. I have some AMS1117 3.3v regulators, but they are in an SMT package making mounting them to a thru hole regulator near impossible. I figured since I need to buy more, I will go with LDO regulators. Are there any that perform better than others? Are there any things I should be watching out for? Is there a good place to buy them cheap where I can get them in a pack of 20 or so to stock up?
The most common ldo I saw are le33 and mcp1700
It's a good question, and it deserves a good answer. Since a gateway will probably be mains powered, rather than battery powered, I'm guessing that an LDO with less ripple and/or more noise rejection might improve the range/coverage of the gateway. i.e. just slapping in the cheapest, most common chips might be self defeating. That's too vague an answer though, and I'm sorry I can't do better. Has anyone looked into that angle?
@neverdie Good points though.
Another one that seems promising is the LP2950 series. Just wondering if anyone has had any experience with these?
Did you try them in the end or did you chose another one ?
I didn't know about those, they seem very nice if your node needs low current and you have a high input voltage, the max 30V is really nice for nodes like a led dimmer up to 24V.
@nca78 I did go with those and it seems to be working great.
heinzv last edited by heinzv
I will use the AP2112K 3v3
it has overall very good values, 600mA output current, high effciency. I would not use the AMS1117 for battery usage.
It is also used by the excellent Adafruit Feather:
Output Voltage Accuracy: ±1.5%
Output Current: 600mA (Min.)
Foldback Short Current Protection: 50mA
Enable Function to Turn ON/OFF VOUT
Low Dropout Voltage (3.3V): 250mV (Typ.) IOUT = 600mA
Excellent Load Regulation: 0.2%/A (Typ.)
Excellent Line Regulation: 0.02%/V (Typ.)
Low Quiescent Current: 55μA (Typ.)
Low Standby Current: 0.01μA (Typ.)
cabat last edited by
I used LP2950-5.0 in one node when feeding from 12v - about 3 months everything works quite stably.