US 12,072,723 B2
Techniques to limit overshoot after dropout condition in voltage regulators
Chizim Okpara, Tucson, AZ (US)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed on May 31, 2022, as Appl. No. 17/828,089.
Claims priority of provisional application 63/283,579, filed on Nov. 29, 2021.
Prior Publication US 2023/0168703 A1, Jun. 1, 2023
Int. Cl. G05F 1/571 (2006.01)
CPC G05F 1/571 (2013.01) 20 Claims
OG exemplary drawing
 
1. A voltage regulator, comprising:
an amplifier having a first amplifier input, a second amplifier input, an amplifier output, and an amplifier supply terminal;
a controllable current source having a control terminal coupled to the amplifier output and having a current output coupled to the second amplifier input via a feedback path;
a voltage dropout detector including a voltage dropout detector input and a voltage dropout detector output, the voltage dropout detector input coupled to the current output; and
a current bias boost circuit including a current bias boost input and a current bias boost output, the current bias boost input coupled to the voltage dropout detector output, and the current bias boost output coupled to the amplifier supply terminal, wherein the current bias boost circuit includes:
a trigger circuit coupled to the voltage dropout detector output;
a current injection circuit coupled to the trigger circuit and the amplifier supply terminal; and
a current sinkage circuit coupled to the trigger circuit and the amplifier.