# Most cost effective way to power a bunch op amps +/-12V supply rails from +5V

I'm searching for the most cost effective way to supply +/-12V for 12 TL084 op amps. Reading in the datasheet, it seems they have a typical current output (with load) of about 20mA. So, 12 * 20 = 240mA. Assuming that is correct, I only need about 300mA of current draw from the +/-12V supply.

Here are the solutions I've come across:

• Recom Power - RS6-0512D: This modules takes in 5V and provides +/-12V output. Pretty straight forward but a bit pricy, around 21$CAD. • Using 1 TC1044S charge pump per 2 op amps and an external 5V to 12V boost converter for the whole deal. Total cost: 1.45$CAD (TC1044) * 6 = 8,70$. Add around 4$ for the 5V to 12V converter = 12,70$CAD for the whole thing. Any simple solution I haven't thought of? Are these 2 solutions a standard way to power a bunch of signal processing op-amps? Is it a problem even worth solving with a chip or should I go down the road of implementing this myself? Is there even any advantages to implement this myself? • Asking for recommendations of specific products is not allowed on this site. Nov 19, 2018 at 15:41 • Ok, I'll rephrase the question a bit. Nov 19, 2018 at 15:43 • What i really want to know is not really a specific product but rather if the path I'm looking to take makes sense as I don't really know any other routes. Nov 19, 2018 at 15:50 • Is cost your biggest constraint? Do you have board space constraints area or height? Nov 19, 2018 at 16:38 • Also, how are your solder skills/abilities? Nov 19, 2018 at 16:43 ## 1 Answer One way to tackle this is to implement a boost regulator with two outputs - one inverted, and one non-inverted - such as the TI TPS65130. It's about US$3 / qty. 1 on Digikey, and you'll probably need a few dollars for passives.

Make sure to have decoupling caps (0.1 uF) and bulk caps (4.7 ~ 10 uF) at each op-amp supply pin. If you have low-noise requirements, you can set the boost regulator to +/- 15 V and add +/-12 V LDOs on the outputs.

• Nice alternative. I'll check this out. Nov 19, 2018 at 17:52
• @KévinIsabelle Great! You may want to leave the question open a bit longer (reclick the green check mark) to see if this will work for your application. Also, someone else (perhaps perusing the Unanswered questions) may chime in with alternatives. Nov 19, 2018 at 18:20
• And actually, I've juste checked the price-tag to build this kind of assembly, and it is very close to my solution #2 in terms of price, but more complicated. I see where you were going with the soldering as it is a VQFN package with no leads. Feasible but a bit of a pain for me at prototyping stage. Nov 19, 2018 at 18:47