The capacitance values of the charge-pump capacitors C1 and C2 are critical. Use ceramic or tantalum capacitors in the 0.22μF to 1.0μF range. For applications requiring operation over extended and/or military temperature
ranges, use 1.0μF tantalum capacitors for C1 and C2
So the diagram should have a plus sign for the shown capacitors? I mean I need polarized capacitors?
C1 and C2 must be in the range of .22uF to 1uF as the datasheet indicates. That's a large range, making precision capacitors (±10% tolerance is fine) unnecessary. The datasheet gives the connection polarity for capacitors that are polarized; Cx+ for positive and Cx- for negative. Generally, capacitors lower than 1uF are not polarized, so then, the connection polarity is not relevent for those.
I have chosen these for C1, C2:
KEMET|T110A105K035AT|CAPACITOR, AXIAL, CASE A, 1UF | Farnell LT
Those are fine for C1 and C2.
Also I found:
The values of C4 and C5 can be reduced to 2μF and 1μF, respectively, when using ceramic capacitors. If using aluminum electrolytics, choose capacitance values of 10μF or larger for C4 and C5.
See figure 3b in the PDF it has the plus signs back? Also they use 22uf caps there.
So I'm confused, can anyone list best correct capacitors for my project from these 2 sites:
For C4 and C5, use the same capacitor you choose for C1 and C2, but increase the value to between 4.7uF and 10uF, inclusive.
In figure 3b, the capacitors are nonpolarized, 0.22uF, so they can't be connected backwards.