# Supply current for dual supply

I have a circuit with 3 op amps who require dual +- 5 volt supplies. The datasheets mention their supply currents at 19 mA ,19 mA and ~5 mA. I intend to provide the -5 volts from a charge pump IC . Do the supply currents splits in half for the positive and negative supplies ? What output current the charge pump should be able to provide ?

• Supply currents don't split. The positive supply sources 19mA and the negative supply sinks 19mA (the same current. borns from one and returns to another). ICL7660 (or an equivalent IC) can provide ~10mA if it has a large enough capacitor across its output. Dec 6, 2018 at 8:12
• Do the supply currents splits in half for the positive and negative supplies ? Do you think that an opamp with a 19 mA supply current uses 9.5 mA from the positive supply and 9.5 mA from the negative supply? That is not the case. The opamp doesn't care/know about the symmetric supply. To an opamp +/- 5V is the same as a 10 V supply. It will consume 19 mA and (most of) that current will flow from the pos. supply pin, through the opamp, to the neg. supply pin. Dec 6, 2018 at 8:15