Patent ID: 8502515

Claim:
A multiphase DC-DC converting circuit for providing power to a load, comprising: a plurality of power stage circuits, each of which comprises an upper transistor, a lower transistor, and an output for coupling with the load through an inductor; a first transconductance amplifier circuit, comprising a non-inverting input and an inverting input respectively coupled with two terminals of a detecting resistor; a comparator circuit, comprising a non-inverting input for coupling with the load, an inverting input coupled with the non-inverting input of the first transconductance amplifier circuit, and an output coupled with the inverting input of the first transconductance amplifier circuit; a plurality of current detecting circuits, each of which comprises a first resistor, a second resistor and a capacitor, wherein a first terminal of the first resistor is coupled with the output of one of the power stage circuits, a second terminal of the first resistor is coupled with a first terminal of the capacitor and a first terminal of the second resistor, a second terminal of the capacitor is used for coupling with the load, and a second terminal of the second resistor is coupled with the inverting input of the comparator circuit; a plurality of channel current converting circuits, each of which comprises an input for coupling with the load, the second terminal of the first resistor of one of the current detecting circuits, the first terminal of the capacitor of one of the current detecting circuits, and the first terminal of the second resistor of one of the current detecting circuits; and a channel current balance circuit, comprising an input coupled with an output of the first transconductance amplifier circuit and outputs of the channel current converting circuits, and comprising an output coupled with the power stage circuits for configuring the upper transistors and the lower transistors of the coupled power stage circuits.