US 12,093,064 B2
Wide input voltage range low-power charge pump based LDO
Alexander Heubi, La Chaux-de-Fonds (CH)
Assigned to SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC, Scottsdale, AZ (US)
Filed by SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC, Phoenix, AZ (US)
Filed on Jun. 16, 2022, as Appl. No. 17/807,170.
Claims priority of provisional application 63/260,462, filed on Aug. 20, 2021.
Prior Publication US 2023/0054955 A1, Feb. 23, 2023
Int. Cl. G05F 1/56 (2006.01); G05F 3/26 (2006.01); H02M 3/07 (2006.01)
CPC G05F 1/56 (2013.01) [G05F 3/262 (2013.01); H02M 3/07 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A low-dropout linear regulator comprising:
a voltage-to-frequency circuit including a first input receiving a reference voltage, a second input, and an output providing a pulse chain at a frequency related to a voltage difference between the first and second inputs;
a charge pump circuit receiving the pulse chain and switching one or more charge pumps based on the pulse chain to provide a charge pump output voltage; and
a current mirror circuit including:
a first metal-oxide semiconductor (MOS) transistor having a first terminal coupled to a supply voltage through a resistor, a second terminal connected to the charge pump output voltage, and a gate connected to the second terminal; and
a second MOS transistor having a first terminal connected to the supply voltage, a second terminal providing an output connected to a positive terminal of an output capacitor and to the second input of the voltage-to-frequency circuit, and a gate connected to the gate of the first MOS transistor.