Texas Instruments Incorporated
Low dropout regulator (LDO) with frequency-dependent resistance device for pole tracking compensation

Abstract:

A system includes a low dropout regulator (LDO) circuit. The LDO circuit includes an error amplifier with an input node, a reference node, and an output node. The LDO circuit also includes a pass transistor with a control terminal, a first current terminal, and a second current terminal. The control terminal is coupled to the output node of the error amplifier, the first current terminal is coupled to a voltage source node, and the second current terminal is coupled to an LDO output node. The LDO output node is coupled to the input node of the error amplifier. The LDO circuit also includes a switched-capacitor network coupled between error amplifier and the pass transistor. The switched-capacitor network comprises a pair of switches and a current-controlled oscillator coupled to control terminals of the switches.