Abstract: An integrated circuit (IC) includes an input/output (I/O) circuitry with a first circuitry section including I/O pins and a second circuitry section including I/O pins. The first and second circuitry sections are mutually exclusive sections of the I/O ring. The first circuitry section includes a first I/O pin configured to receive an input voltage from a first energy source and a second I/O pin connectable to an external startup capacitor. A startup circuit is coupled to the first I/O pin and the second I/O pin. Upon receiving the input voltage from the first energy source, the startup circuit enters a during the startup phase and isolates the first circuitry section from the second circuitry section, and provides charge to the external startup capacitor. In response to achieving a predetermined minimum charge on the external startup capacitor, the first circuitry section is connected to the second circuitry section, and the startup phase ends and the IC transitions to a functional mode of operation.

Abstract: A controller for a DC-DC converter that includes an inductor. The DC-DC converter has three phases of operation: a first phase, in which an input voltage charges the inductor; a second phase, in which the inductor discharges to a load; and a third phase, in which the inductor is disconnected from the load and in which the input voltage does not charge the inductor. The controller is configured to set a control-factor based on the input voltage of the DC-DC converter, and set the duration of the third phase based on the control-factor and the sum of the duration of the first phase and the second phase.

Abstract: An integrated circuit includes a load circuit having multiple functional modules, a first voltage regulator configured to provide a supply voltage to the multiple functional modules, and 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. A switch matrix is interconnected between the first voltage regulator, the supply current monitoring circuit, and the functional modules. Each of the functional modules in successive order is a module under test, and the switch matrix is configured to disconnect the first voltage regulator from the module under test and 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.