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IC 7660 showing -2.5 v ?

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Sharagim

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Hello,
With a typical circuit as datasheet with a IC 7660 I am getting -2.5v between pin 5 and GND is this correct (Vin is +5v)?

BR,
 

In a (correctly built) typical circuit, 2.5V output would be achieved with about 40 mA load current.
 

but isnt it a 5v >>> -5v ? why -2.5?
 

No. It is very bad result. It means that you have overload. What is your load and what storage capacitors do you use (nominal capacitance)?
 

load is a voltmeter only and I use a 10u capacitor between pin 2 and 4
 

Sorry I forget it , when I put it there (10u) now I see -5
10u is ok ? or I should use more?
 

10u is OK. In your case there is no reasons to try change recommended value because you have very low load (high input impedance of voltmeter).
 
Hi,the exact result should be -5V.And could you post your circuit?
 

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