0.5A fast CMOS LDO

The paper presents a 0.5 A fast response CMOS LDO built in a double-metal 0.5 mum 5.5 V CMOS technology. It includes a symmetrical op amp configured as voltage follower, having a built-in adaptive bias behavior. The frequency compensation is cascode-Miller type. The circuit consumes 55 muA without load, less than 90 muA at full load, and uses a 1 V voltage reference. Output current capability is 0.5 A, while dropout voltage value is typical 300 mV.