公开(公告)号：US11368126B1

公开(公告)日：2022-06-21

申请号：US17444320

申请日：2021-08-03

Applicant: NXP B.V.

Inventor： Ricardo Pureza Coimbra ,  Stefano Pietri ,  Vitor Moreira Gomes ,  Eduardo Ribeiro da Silva

IPC: H03B5/36 ,  H02M3/158

Abstract: A first switch is operable to couple a start-up oscillator circuit to a first crystal pin during operation in a start-up mode and decouple the start-up oscillator circuit from the first crystal pin during operation in a normal mode, and a second switch is operable to couple the start-up oscillator circuit to a second crystal pin during operation in the start-up mode and decouple the start-up oscillator circuit from the second crystal pin during operation in the normal mode. A switched oscillator circuit is coupled to the startup oscillator during operation in the startup mode, and to the first and second crystal pins during operation in the start-up and normal modes. The switched oscillator circuit includes a sample and charge circuit which is configured to sample a direct current (DC) level of the first crystal pin and pre-charge a first coupling capacitor during operation in the startup mode.

公开(公告)号：US10784783B1

公开(公告)日：2020-09-22

申请号：US16737623

申请日：2020-01-08

Applicant: NXP B.V.

Inventor： Jitendra Prabhakar Harshey ,  Hendrik Johannes Bergveld ,  Olivier Trescases ,  Edevaldo Pereira da Silva Junior ,  Stefano Pietri ,  Oscar Igor Robles Palacios

IPC: H02M1/00 ,  H02M3/158

Abstract: A DC-DC converter selectively operates in at least a first burst mode having at least one first-mode charge cycle with a first-mode charging phase followed by a first-mode discharging phase or a second burst mode having at least one second-mode charge cycle with a second-mode charging phase followed by a second-mode discharging phase. A first-mode charging phase is terminated when an inductor current flowing through the inductance reaches a first-mode peak-current threshold, and a first-mode discharging phase is terminated when the inductor current reaches a first-mode valley-current threshold. A second-mode charging phase is terminated when the inductor current reaches a second-mode peak-current threshold, wherein the second-mode peak-current threshold is different from the first-mode peak-current threshold, and the second-mode discharging phase is terminated when the inductor current reaches a second-mode valley-current threshold, wherein the second-mode valley-current threshold is different from the first-mode valley-current threshold.

公开(公告)号：US10720838B1

公开(公告)日：2020-07-21

申请号：US16431927

申请日：2019-06-05

Applicant: NXP B.V.

Inventor： Jitendra Prabhakar Harshey ,  Olivier Trescases ,  Edevaldo Pereira Da Silva Junior ,  Stefano Pietri ,  Jurgen Geerlings ,  Hendrik Johannes Bergveld

IPC: H02M3/158 ,  H02M1/00 ,  G05F1/56 ,  G05F1/52

Abstract: Embodiments provide forced-burst voltage regulation for burst mode direct-current-to-direct-current (DC-DC) converters in integrated circuits. The DC-DC converter generates an output voltage and operates in a burst mode to raise the output voltage to a threshold voltage. A controller is coupled to the DC-DC converter. In operation, the DC-DC converter is configured to perform the burst mode based upon a low-voltage detection for the output voltage. The DC-DC converter is further configured to perform the burst mode when a force-burst command is asserted by the controller to the DC-DC converter regardless of a state for the low-voltage detection. For one embodiment, the force-burst command is asserted as a burst control signal from the controller to the DC-DC converter to generate a long quiet period for sensitive actions. For another embodiment, the force-burst command is asserted using enable and refresh control signals to facilitate low-power operation.