Patent ID: 9148140
Filing Date: 2015-09-29
Classification: G05F,H01L,H03K,H05B,Y02B

Abstract:
1. A method for providing high current with low dropout and current limiting comprising: splitting an output current at a current output node into a first current which flows through a series connection of a first MOSFET and a sensing resistor to ground and a second current which flows through a second MOSFET to ground, where the second current is greater than the first current; maintaining a first gate-to-source voltage at the first MOSFET which is substantially equal to a second gate-to-source voltage at the second MOSFET, wherein an output of an operational amplifier (op-amp) is directly connected to a gate of the first MOSFET, a current source is directly connected between a gate of the second MOSFET and ground, and a resistor is directly connected between the output of the op-amp and the second MOSFET; and using negative feedback to limit a current flowing through the second MOSFET.