System and method for testing a power supply controller

A method of testing an integrated circuit, the method comprising:

• detecting if an external switch is coupled between a first pin and a second pin;
• if the external switch is detected, determining if there is a short circuit between the second pin and a third pin;
• if the short circuit between the second pin and the third pin is not detected, determining if there is a short circuit between a fourth pin configured to be coupled to a control terminal of the external switch and the second pin;
• and
• if the short circuit between the fourth pin and the second pin is not detected, determining if there is a conductive path between the first pin and the second pin when the fourth pin activates the external switch.

A power supply controller integrated circuit comprising:

• a first pin configured to receive a first power supply voltage;
• a second pin configured to receive a second power supply voltage;
• a third pin configured to drive a control pin of an external switch coupled between the first pin and the second pin;
• a fourth pin configured to drive a switched voltage to a switched-mode power converter;
• and
• a testing circuit configured to detect whether the external switch is coupled to the first, second and third pins, and whether there is a short circuit between the second pin and the fourth pin, and whether there is a short circuit between the second pin and the third pin.