公开(公告)号：US10263523B1

公开(公告)日：2019-04-16

申请号：US15879483

申请日：2018-01-25

Applicant: Silicon Laboratories Inc.

Inventor： Jeffrey L. Sonntag ,  Joselyn Torres-Torres ,  Michael D. Mulligan

IPC: H02M3/158 ,  H02M3/157 ,  H03M5/08 ,  H02M3/335 ,  H02M1/00

Abstract: A DC-DC converter with a programmable pulse time limit. A charge pulse begins when the output voltage reaches a minimum threshold and terminates in response to a discharge indication, in which charge current flows through an inductive element while the charge pulse is provided. The discharge indication is provided to initiate a discharge pulse when the charge current reaches a peak threshold, which terminates in response to a reset indication. Current is discharged from the inductive element during the discharge pulse. A zero crossing detector provides the reset indication when the discharge current reaches a minimum level. A programmable timing circuit limits a duration of either one or both of the charge pulse and the discharge pulse to prevent hangup or excessive output voltage ripple. The DC-DC converter may include a memory that stores a digital value used to program the programmed time duration of the programmable timing circuit.

公开(公告)号：US10423174B1

公开(公告)日：2019-09-24

申请号：US15959535

申请日：2018-04-23

Applicant: Silicon Laboratories Inc.

Inventor： Jeffrey L. Sonntag ,  Dazhi Wei ,  Michael D. Mulligan ,  Zachary A. Kaufman ,  Joselyn Torres-Torres

IPC: H02M3/156 ,  H02M3/158 ,  G05F1/563 ,  H03K5/24 ,  H02M1/08 ,  H02M1/00

Abstract: A pulse frequency modulated (PFM) voltage converter autonomously switches between buck, buck-boost, and boost modes as a function of the input and output voltages. The voltage converter may also switch autonomously between buck mode and a low drop out (LDO) mode when configured in a system in which the battery voltage is known to always be higher than the output voltage.