US 12,411,510 B2
Low-power fast-transient low-dropout (LDO) regulator with direct feed-forward
Adrian Lin, Austin, TX (US)
Assigned to Cypress Semiconductor Corporation, San Jose, CA (US)
Filed by Cypress Semiconductor Corporation, San Jose, CA (US)
Filed on Mar. 1, 2023, as Appl. No. 18/177,039.
Prior Publication US 2024/0295890 A1, Sep. 5, 2024
Int. Cl. G05F 1/575 (2006.01); G05F 1/46 (2006.01); G05F 3/26 (2006.01)
CPC G05F 1/575 (2013.01) [G05F 1/468 (2013.01); G05F 3/262 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A low-dropout (LDO) regulator comprising:
a voltage reference node; and
a one-stage differential amplifier coupled to the voltage reference node, the one-stage differential amplifier comprising:
a differential pair of NMOS transistors;
a mirroring load comprising a first current source and a PMOS transistor;
a direct feed-forward (DFF) loop formed by the PMOS transistor and its parasitic gate-to-drain capacitance during a load transient; and
an indirect regulation feedback (IRF) loop formed by the differential pair of NMOS transistors, a resistor, and the PMOS transistor to provide direct current (DC) voltage regulation.