Texas Instruments Corporation

Chizim Obinuchi Okpara

Avinash Shreepathi Bhat

A voltage regulator includes an amplifier having a first amplifier input, a second amplifier input, an amplifier output, and an amplifier supply terminal. A controllable current source has a control terminal coupled to the amplifier output and has a current output coupled to the second amplifier input via a feedback path. A voltage dropout detector includes a voltage dropout detector input and a voltage dropout detector output. The voltage dropout detector input is coupled to the current output. A current bias boost circuit includes a current bias boost input and a current bias boost output. The current bias boost input is coupled to the voltage dropout detector output, and the current bias boost output is coupled to the amplifier supply terminal.

Techniques to limit overshoot after dropout condition in voltage regulators

A linear regulator includes a pass transistor, a buffer transistor, and a low-pass filter circuit. The pass transistor is configured to pass a current from an input terminal to an output terminal. The buffer transistor is coupled to the input terminal and the pass transistor, and is configured to control the pass transistor. The low-pass filter circuit is coupled to the input terminal and the buffer transistor, and is configured to modulate a threshold voltage of the buffer transistor responsive to a transient at the input terminal.

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Chizim Obinuchi Okpara