How much current can be safely be drawn from the VCC and REF pins?
The current limit of VCC is set at a maximum of 15 mA and the current limit of the REF pin is set at a minimum of 10 mA. Care must be taken to load these pins at much less than the current limits to limit the power dissipation on the die. The current drawn from these pins is a load on the input supply and as such the power dissipation can be significant even at a load of 10 mA depending on the VIN voltage. There is on die thermal protection that will shutdown the part if the on die temperature is above 165 °.C.
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