Patent ID: 7508182

Claim:
A DC-to-DC power converter with improved monitoring of output inductor current delivered to a load, comprising: at least one power switch connected to an input voltage source; an output inductor connected to the at least one power switch and to the load; and a current sensor circuitry coupled to the output inductor, the current sensor circuitry providing a current sense signal corresponding to current passing through an internal DC resistance of the output inductor, the current sensor circuitry comprising: a filter comprising a first resistor connected in series with a first capacitor; and a second capacitor connected in parallel with the first resistor, the first and second capacitors forming an AC voltage divider; wherein the second capacitor is characterized by a second capacitance value that is at least one order of magnitude smaller than a first capacitance value of the first capacitor, thereby increasing signal-to-noise ratio of the current sense signal for improved monitoring of the output inductor current delivered to the load.