I need to generate a negative voltage of approximately -12V from a 12V power supply. I read about ICL7660A that performs supply voltage conversions from positive to negative for an input range of +1.5V to +12.0V resulting in complementary output voltages of -1.5V to -12.0V. I need it to feed NE5532 OPAMPs symmetrically to perform a low pass filter, to transform a square wave into a sine wave.

However, I looked at the ICL7660A datasheet and it does not explain very much about current capacity, just a graph (datasheet Figure 7) of load current vs. output voltage. In that graph, the ICL7660A is fed by a 5V power supply and the load current seems to reach zero when output voltage reaches -5V.

_{(Image source: Figure 7 from ICL7660A datasheet)}

I don't know exactly how much current will be required, but there are 4 NE5532 OPAMPs. I suppose that something near 10 mA is enough, no more than that.

So, I was thinking: I need -12V from a 12V power supply, is it possible? If not, is there a better approach?

I need to generate a negative voltage of approximately -12V from a 12V power supply. I read about ICL7660A that performs supply voltage conversions from positive to negative for an input range of +1.5V to +12.0V resulting in complementary output voltages of -1.5V to -12.0V. I need it to feed NE5532 OPAMPs symmetrically to perform a low pass filter, to transform a square wave into a sine wave.

However, I looked at the ICL7660A datasheet and it does not explain very much about current capacity, just a graph (datasheet Figure 7) of load current vs. output voltage. In that graph, the ICL7660A is fed by a 5V power supply and the load current seems to reach zero when output voltage reaches -5V.

_{(Image source: Figure 7 from ICL7660A datasheet)}

I don't know exactly how much current will be required, but there are 4 NE5532 OPAMPs. I suppose that something near 50 mA is enough, no more than that.

So, I was thinking: I need -12V from a 12V power supply, is it possible? If not, is there a better approach?

I need to generate a negative voltage of aproximatelly -12V from a 12V power supply. I read about ICL7660A that performs supply voltage conversions from positive to negative for an input range of +1.5V to +12.0V resulting in complementary output voltages of -1.5V to -12.0V. I need it to feed NE5532 OPAMPs simetrically to perform a low pass filter to transform a square wave into a sine wave.

However, I took a look at its datasheet and it does not inform very much about current capacity, only shows a graphic, on it's figure 7, of load-current x output-voltage. In this graphic the ICL7660A is feed by a 5V power supply and the load current seems to reach zero when output voltage reaches -5V. I don't know exactly how much current will be drained, but are 4 OPAMPs NE5532 , I suppose that something near 10 mA is enought, no more than that.

So, I was thinking, I need -12V from a 12V power supply, is it possible  ? If not, is there a better approach  ?

I need to generate a negative voltage of approximately -12V from a 12V power supply. I read about ICL7660A that performs supply voltage conversions from positive to negative for an input range of +1.5V to +12.0V resulting in complementary output voltages of -1.5V to -12.0V. I need it to feed NE5532 OPAMPs symmetrically to perform a low pass filter, to transform a square wave into a sine wave.

However, I looked at the ICL7660A datasheet and it does not explain very much about current capacity, just a graph (datasheet Figure 7) of load current vs. output voltage. In that graph, the ICL7660A is fed by a 5V power supply and the load current seems to reach zero when output voltage reaches -5V.

_{(Image source: Figure 7 from ICL7660A datasheet)}

I don't know exactly how much current will be required, but there are 4 NE5532 OPAMPs. I suppose that something near 10 mA is enough, no more than that.

So, I was thinking: I need -12V from a 12V power supply, is it possible? If not, is there a better approach?