A startup circuit operating with a bandgap circuit having a predetermined node with a current change proportional to temperature change and a current source connected to the predetermined node comprising: a controllable current switch connected between the predetermined node and a control node of the current source; wherein when the voltage at the predetermined node is floating when starting the bandgap circuit, the controllable current switch biases the current source at the control node whereby the voltage at the predetermined node changes based on the current provided by the current source causing the bandgap circuit to start its normal operation.