ADP2114/2116 output current

Hi,

I am trying to consider DC-DC regulator to the power of analog circuit with a high sensitivity. As a result of reading the attached file, I want to consider the ADP2114/2116.


1. Using single mode, it outputs 4A/6A. For example, by connecting in parallel 2 devices, is it possible to output the current 2 times more?

2. About Fig.6 and Fig.7 of the attached file, it shows that there is no influence of the noise of the power supply. In this point of view, which of ADP2114/2116 and ADP2323/2325 is better? I consider ADP2323/2325 also because they can output large current.

3. I am also looking for a negative DC-DC supply. Is there a device that can be expected noise performance similar to that of the ADP2114/2116?


Best Regards,

ymsk

Powering_High_Speed_ADCs.pdf
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  • 0
    •  Analog Employees 
    on May 2, 2014 9:20 PM

    Hi Ymsk,

    1) Theoretical, it is possible to connect the two converters in parallel to double the maximum load current. However, some modifications are needed to maintain load sharing and stability between the two converters and reduce input and output ripple, also the 2 devices might not be balanced very well and synchronization with 90 deg phase shift for example is also needed, which makes this option less practical. For high current applications, the ADP1850/1 may be a good fit.

    2) Both ADP2114/2116 and ADP2323/2325 (and any other converters) can achieve the same noise level when using filtering ferrite beads at the output of the converter,  yet it is hard to design the 2nd stage filter with high output current(>4A) and keep the loop stable.

    3) For the negative output, we have some power parts can be configured as inverting Buck-Boost ( ADP230X, ADP238X, ADP244X ) and SEPIC-CUK( ADP161x, ADP1621). For low noise application, ferrite bead filter or LDO is needed as well.

    All the design tools are downloadable at www.analog.com/ADIsimPower.

    Best Regards,

    Hong

Reply
  • 0
    •  Analog Employees 
    on May 2, 2014 9:20 PM

    Hi Ymsk,

    1) Theoretical, it is possible to connect the two converters in parallel to double the maximum load current. However, some modifications are needed to maintain load sharing and stability between the two converters and reduce input and output ripple, also the 2 devices might not be balanced very well and synchronization with 90 deg phase shift for example is also needed, which makes this option less practical. For high current applications, the ADP1850/1 may be a good fit.

    2) Both ADP2114/2116 and ADP2323/2325 (and any other converters) can achieve the same noise level when using filtering ferrite beads at the output of the converter,  yet it is hard to design the 2nd stage filter with high output current(>4A) and keep the loop stable.

    3) For the negative output, we have some power parts can be configured as inverting Buck-Boost ( ADP230X, ADP238X, ADP244X ) and SEPIC-CUK( ADP161x, ADP1621). For low noise application, ferrite bead filter or LDO is needed as well.

    All the design tools are downloadable at www.analog.com/ADIsimPower.

    Best Regards,

    Hong

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