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.

 

Yes.

http://www.mouser.com/Passive-Compo...rs/_/N-5g8m?P=1z0wrkrZ1z0x6g0Z1z0x81eZ1z0wxct

 

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.

 

I will use these caps & will see the result
http://www.digikey.com/product-detail/en/C2012X5R1V106K125AC/445-14418-6-ND/3960514

 

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

 

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.

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.