Ceramic caps with TC7660

Discussion in 'General Electronics Chat' started by Vindhyachal Takniki, Feb 10, 2015.

  1. Vindhyachal Takniki

    Thread Starter Member

    Nov 3, 2014
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    6
    Can I use 10uF ceramic caps with TC7660.
    In datasheet they have 10uF with + symbol on their caps?

    I have to generate -2.5V & -1.8V from +2.5V & +1.8V respectively.
    Attached is ckt.
     
    • ckt.pdf
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  2. #12

    Expert

    Nov 30, 2010
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  3. ScottWang

    Moderator

    Aug 23, 2012
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    I didn't use that kind of cap for this kind of IC, but you can try if it can works properly.
    Usually I'm using Electrolytic capacitor and Tantalum capacitor.
     
  4. Vindhyachal Takniki

    Thread Starter Member

    Nov 3, 2014
    349
    6
  5. AnalogKid

    Distinguished Member

    Aug 1, 2013
    4,546
    1,252
    Yes. The 7660, and most other charge pump circuits, LOVE ceramic caps. The only problem is physical, not electrical. Ceramic caps are, well, ceramic. They are brittle and inflexible, and can fracture when a board is flexed. For maximum reliability (we do hi-rel MIL stuff) they can't be placed near board edges, boards must be supported every so-many inches, etc. We are moving to a new breed of ceramic surface mount cap called soft-termination or flex-term that has a thin flexible resin between the solder caps and the ceramic layers.

    http://www.digikey.com/product-sear...e=0&rohs=0&quantity=&ptm=0&fid=0&pageSize=500

    ak
     
  6. ian field

    Distinguished Member

    Oct 27, 2012
    4,415
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    Those capacitors can sometimes cause trouble with linear regulators - all to do with poles & zeros and phase stability on the internal regulation.

    My guess is they should work a fair bit better than aluminium electrolytics on a charge pump booster.
     
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