Patent ID: 7525295
Filing Date: 2009-04-28
Classification: H02M,H03K

Abstract:
1. Switching DC-DC converter comprising an inductor having a first terminal and a second terminal an output capacitor coupled to the second terminal, a diode coupled to the first terminal, an integrated control circuit including an integrated output switch having a current input and a current output with a specified output current range, said current input being coupled with an input voltage and said current output being coupled to the first terminal of the inductor, and a transistor coupled with a current input to said input voltage, with a control input coupled to the current input of the output switch, and with a current output coupled to the current output of the output switch, said output switch providing a first current and said transistor providing a second current being added with said first current at a nod coupled to the first terminal of said inductor configured for providing a DC output voltage at said output capacitor, and an impedance coupled with one end to the input voltage and the current input of the transistor and connected with a second end with the control input of the transistor and with the current input of the output switch for adjusting the current ratio between said first and second currents by providing a voltage drop between the current input and the control input of the transistor, for extending an output current range of the switching DC-DC converter above the specified output current range of said integrated control circuit.