公开(公告)号：US20190384337A1

公开(公告)日：2019-12-19

申请号：US16011467

申请日：2018-06-18

Applicant: Analog Devices Global Unlimited Company

Inventor： Danzhu LU ,  Brandon Day ,  Yihui Chen ,  Jie He

IPC: G05F1/575 ,  G05F1/59 ,  G05F1/565

Abstract: The subject disclosure includes paralleling of monolithic embedded low drop-out (LDO) linear regulator power rails to provide additional load current, while maintaining accurate current sharing and balancing between the paralleled LDOs without additional power consumption for different load current requirements. Lossless current sensing is used to sense the current for each channel. An offset generator compares the voltages for a master channel and one or more slave channels, and generates an offset voltage according to the sensed error. The offset voltage is added between an input reference voltage and an output regulated voltage to cancel the offset of each channel, so the current of each channel is substantially the same. The lossless current sensing can be realized with equivalent series resistance compensation or current limit sensing. The offset generator can be realized with a resistor and current mirror topology or an input pair added to an error amplifier input.