Startup circuit for high voltage low power voltage regulator

A circuit for voltage regulator startup, the circuit comprising:

• a voltage regulation circuit having first and second regulator inputs and a regulator output;
• a startup circuit having a startup input and a startup output, the startup input coupled to the first regulator input;
• a reference generation circuit having first and second reference inputs and first and second reference outputs, the first reference input coupled to the regulator output, the second reference input coupled to the startup output, and the first reference output coupled to a reference output terminal and to the second regulator input;
• and
• a reference detection circuit having first and second detection inputs and a detection output, the first detection input coupled to the regulator output, the second detection input coupled to the second reference output, and the reference detection circuit being configured to provide a reference ready signal at the detection output responsive to a voltage at the second detection input being within a reference specification.