Online supply current monitoring

A method comprising:

• providing a supply voltage from a first voltage regulator to multiple functional modules of a load circuit of an integrated circuit in a functional mode;
• and
• testing each of the functional modules, wherein the functional module undergoing testing is a module under test, and the testing comprises:
• disconnecting the first voltage regulator from the module under test;
• connecting a supply current monitoring circuit to the module under test;
• providing a test supply voltage from a second voltage regulator of the supply current monitoring circuit;
• and
• measuring, at a current monitor of the supply current monitoring circuit, a supply current of the module under test in response to providing the test supply voltage.

An integrated circuit comprising:

• a load circuit having multiple functional modules;
• a first voltage regulator configured to provide a supply voltage to the multiple functional modules;
• a supply current monitoring circuit including a second voltage regulator and a current monitor, the second voltage regulator being configured to provide a test supply voltage;
• and
• a switch matrix interconnected between the first voltage regulator, the supply current monitoring circuit, and the functional modules, wherein each of the functional modules in successive order is a module under test, and for the module under test, the switch matrix is configured to connect the supply current monitoring circuit to the module under test such that the second voltage regulator provides the test supply voltage to the module under test and the current monitor measures a supply current of the module under test in response to the test supply voltage, the switch matrix is further configured to disconnect the first voltage regulator from the module under test after the second voltage regulator of the supply current monitoring circuit begins providing the test supply voltage to the module under test, and the switch matrix is further configured to enable continued connection of the first voltage regulator to the remaining ones of the multiple functional modules to provide the supply voltage to the remaining ones of the multiple functional modules while the module under test is connected to the supply current monitoring circuit.