Seeking low EMI DC/DC-circuit for +5V => +12V & -12V @10mA

Hello,

in high precision industrial measurement applications, analog signals in the range of +/-10V are most common.
For the supply of the DAC and output OPAmp I need about +/-12V...+/-15V @ max. 10mA
As the main supply rail is +5V, I need a step-up & inverting DC/DC-circuit to get my analog rails.
The voltages don't need good regulation and I don't need galvanic isolation for this rails.
The most demanding requirements are:
1. low EMI - especially on the ground rail
2. very low noise above 100kHz on the +/-12V rails => easy and small filtering possible
3. relatively small circuit - 15 x 15mm would be preferable

I wonder if there is a circuit to do the step-up & inverting with one converter IC?
What topology would be best for low EMI?
Thanks for any hints or circuit proposals.

Top Replies

    •  Analog Employees 
    May 10, 2021 +1 suggested

    Hi Alexxx,

    You can check our LT8362 which is a boost/sepic/inverting monolithic converter. Its EMI performance can be found at page 28 of the datasheet, and is available in DFN packages. However, this is…

Parents
  • 0
    •  Analog Employees 
    on May 10, 2021 12:29 AM

    Hi Alexxx,

    You can check our LT8362 which is a boost/sepic/inverting monolithic converter. Its EMI performance can be found at page 28 of the datasheet, and is available in DFN packages. However, this is a single-output IC only so you would have to build another for your negative rail.

    If EMI is your most demanding requirement, you can also check LT8336 (Boost converter only) which is under our Silent Switcher product line. Here is a quick parametric search to help you decide. You can look for Spread spectrum, low EMI, or/and Silent Switcher features for your requirements. Thanks!

    Regards,

    Audi

Reply
  • 0
    •  Analog Employees 
    on May 10, 2021 12:29 AM

    Hi Alexxx,

    You can check our LT8362 which is a boost/sepic/inverting monolithic converter. Its EMI performance can be found at page 28 of the datasheet, and is available in DFN packages. However, this is a single-output IC only so you would have to build another for your negative rail.

    If EMI is your most demanding requirement, you can also check LT8336 (Boost converter only) which is under our Silent Switcher product line. Here is a quick parametric search to help you decide. You can look for Spread spectrum, low EMI, or/and Silent Switcher features for your requirements. Thanks!

    Regards,

    Audi

Children