Patent ID: 7592777
Filing Date: 2009-09-22
Classification: H02J

Abstract:
1. An integrated circuit (IC) for controlling a DC to DC converter, said (IC) comprising: a current source configured to generate a current source signal, said current source signal is received at a common node; a first error amplifier configured to compare a first signal representative of a charging current provided to a rechargeable battery with a maximum charging current and provide a current control signal received at said common node in response to said comparison; an internal compensation network, internal to said IC, comprising a compensation capacitor coupled in series with a compensation resistor, said internal compensation network is coupled to said common node; wherein said current source is configured to charge said compensation capacitor an generate a compensation signal at said common node, said compensation signal is proportional to the voltage of said compensation capacitor; and wherein, if said first signal representative of a charging current provided to a rechargeable battery exceeds said maximum charging current, said current control signal sinks said current source signal and reduces said compensation signal; and a comparator configured to compare an inductor current signal representative of an inductor current through an inductor of said DC to DC converter with said compensation signal, wherein a reduction in said compensation signal results in a control signal provided by said current mode battery charger controller to reduce a charging current from said DC to DC controller.