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| Jellybean dual output DC DC converters? |
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| PartialDischarge:
So, for a battery operated system (3 to 9V) what are the most used DC-DC converters that give + - supplies (+-10..+-15V, with less than 100mA) and low noise??? I know that there are lots, last week I opened a fluke equipment and it had a MAX1675 for positive and a ICL7660 for negative....but I never know if I'm missing something that 'everyone' is using |
| spec:
Hi MT, Not sure what the chip is, but this is quite a common module to give +&- supplies: https://www.google.co.uk/search?q=DC+to+plus+and+minus+supplies&tbm=isch&tbo=u&source=univ&sa=X&ved=2ahUKEwiYp6aS4_feAhUIa8AKHfQmDQAQsAR6BAgEEAE&biw=1333&bih=602#imgdii=mnz4uwgs7CiHwM:&imgrc=Zfs9VCGQI7xbgM: |
| technix:
I have some personal favorites but I am not sure if my favoritism is universal: * Liberal use of TPS562200 family of 2A adjustable single-output DC-DC buck converter, * Liberal use of LP2985-family of 50mA/150mA/300mA single output LDO regulator, If your battery doesn't go over 5V, you can also use: * Liberal use of LM3671 family of 600mA fixed and adjustable single output DC-DC buck converter, * MP2212 adjustable dual output DC-DC buck converter, Or if you use a Li-po, have a MCU or other type of CPU, and need a few different power rails: * X-Power AXP209 microprocessor PMIC |
| PartialDischarge:
--- Quote from: spec on November 28, 2018, 07:09:18 pm ---Hi MT, Not sure what the chip is, but this is quite a common module to give +&- supplies: https://www.google.co.uk/search?q=DC+to+plus+and+minus+supplies&tbm=isch&tbo=u&source=univ&sa=X&ved=2ahUKEwiYp6aS4_feAhUIa8AKHfQmDQAQsAR6BAgEEAE&biw=1333&bih=602#imgdii=mnz4uwgs7CiHwM:&imgrc=Zfs9VCGQI7xbgM: --- End quote --- Interesting, that seems like a boost converter for the +, and a charge pump for the -. Probably a chip sold in lcsc. That solution lowers emi, since only one branch is switching but regulation in the negative branch is bad. |
| PartialDischarge:
Its probably a AP3012, pinout matches the picture traces, and there seem to be some chinese knockoffs |
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