Abstract: In a device having an integrated circuit (“IC”) 310 with a single-pin output (316) at which a tri-state output is generated, a tri-state charge pump (370) is disclosed for extending the IC output range. The charge pump (370) has a switching circuit (320) coupled to an output circuit (340). The charge pump has (370) three modes of operation: 1) source—wherein the switching circuit (320) causes the output circuit (340) to generate a charge current that can be translated into a maximum saturation voltage that is higher than a maximum value generated by the IC; 2) sink—wherein the switching circuit (320) causes the output circuit (340) to generate a discharge current that can be translated into a voltage that is the same as or smaller than a minimum value generated by the IC; and 3) tri-state —wherein the charge pump (370) replicates a tri-state output of the IC.

Abstract: In a device having an integrated circuit (“IC”) 310 with a single-pin output (316) at which a tri-state output is generated, a tri-state charge pump (370) is disclosed for extending the IC output range. The charge pump (370) has a switching circuit (320) coupled to an output circuit (340). The charge pump has (370) three modes of operation: 1) source—wherein the switching circuit (320) causes the output circuit (340) to generate a charge current that can be translated into a maximum saturation voltage that is higher than a maximum value generated by the IC; 2) sink—wherein the switching circuit (320) causes the output circuit (340) to generate a discharge current that can be translated into a voltage that is the same as or smaller than a minimum value generated by the IC; and 3) tri-state—wherein the charge pump (370) replicates a tri-state output of the IC.