Patents Assigned to Monolithic Power Systems
  • Resonant converter with adaptive on-time control and the method thereof
    Patent number: 10186975
    Abstract: A resonant converter adopts adaptive on-time control to provide better transient response. When the output voltage of the resonant converter varies, the on-time length of a power switch in power stages is adjusted, so that the switching frequency and the gain are regulated and optimized.
    Type: Grant
    Filed: February 15, 2018
    Date of Patent: January 22, 2019
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Qian Ouyang
  • Control circuit for buck-boost power converter with stable bootstrap voltage refresh
    Patent number: 10181793
    Abstract: A buck-boost power converter and a control circuit for the buck-boost converter. The buck-boost power converter includes a first power switch and a second power switch coupled in series between an input port and a reference ground, and a third power switch and a fourth power switch coupled in series between an output port and the reference ground. The control circuit receives a pulse skipping control signal and a zero-crossing indication signal, and controls the second power switch and/or the third power switch to turn on when the pulse skipping control signal controls the buck-boost power converter to enter into a pulse skipping mode and the zero-crossing indication signal indicates that an output inductor current of the buck-boost power converter crosses zero.
    Type: Grant
    Filed: August 3, 2017
    Date of Patent: January 15, 2019
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Jian Zhang
  • Non-audible control circuit for a buck converter in DCM mode
    Patent number: 10164514
    Abstract: Noise-free control circuit and control method for controlling a switching converter to avoid generating audile noises. The noise-free control circuit has a timer used to set a noise-free frequency threshed. When the switching frequency of the switching converter is decreased to the noise-free frequency threshold, the switching frequency of the switching converter is limited to the noise-free frequency threshold. The noise-free frequency threshold is higher than a maximum audible frequency of an audio noise.
    Type: Grant
    Filed: July 13, 2017
    Date of Patent: December 25, 2018
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Lei Li
  • Battery charging circuit with high capacity, control circuit and associated control method
    Patent number: 10116155
    Abstract: A battery charging circuit has a first switching circuit and a second switching circuit which are coupled in parallel. A control circuit has a plurality of feedback control loops, a logic integrated circuit, a first logic circuit and a second logic circuit, wherein the plurality of feedback control loops provides a plurality of feedback control signals, the logic integrated circuit provides a logic integrated signal based on the plurality of feedback control signals, the frequency dividing circuit provides a first frequency dividing signal and a second frequency dividing signal based on the logic integrated signal, the first logic circuit controls the first switching circuit based on the first frequency dividing signal and a first duration signal, the second logic circuit controls the second switching circuit based on the second frequency dividing signal and a second duration signal.
    Type: Grant
    Filed: December 21, 2016
    Date of Patent: October 30, 2018
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Min Xu, Qiming Zhao
  • Battery charging circuit, control circuit and associated control method
    Patent number: 10110037
    Abstract: A battery charging circuit receives an input current, and provides a system voltage and a charging current to charge a battery. A control circuit used to control the battery charging circuit has a charging current control loop providing a compensation signal, an inductor current control loop providing a first loop control signal, and a system voltage control loop providing a second loop control signal. The control circuit provides an inductor current reference signal based on the compensation signal and a designed maximum input current level. And the control circuit provides a control signal based on the first loop control signal the second loop control signal to control the battery charging circuit.
    Type: Grant
    Filed: January 17, 2018
    Date of Patent: October 23, 2018
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Qian Ouyang
  • Bipolar junction semiconductor device and method for manufacturing thereof
    Patent number: 10090200
    Abstract: A bipolar junction semiconductor device and associated method of manufacturing, the bipolar junction semiconductor device has a P type substrate, a N type buried layer formed in the substrate, a P? type first epitaxial layer formed on the buried layer, a P? type second epitaxial layer formed on the first epitaxial layer, a PNP BJT unit formed in the first and second epitaxial layers at a first active area, a NPN BJT unit formed in the first and second epitaxial layers at a second active area and a first isolation structure of N type formed in the first and second epitaxial layers at an isolation area. The isolation area is located between the first active area and the second active area, the first isolation structure connected with the buried layer forms an isolation barrier.
    Type: Grant
    Filed: December 19, 2016
    Date of Patent: October 2, 2018
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Yanjie Lian, Daping Fu, Ji-Hyoung Yoo
  • LED driving system and associated control method
    Patent number: 10091846
    Abstract: A LED driving system has an energy storage component receiving an input voltage, a power switch coupled between the energy storage component and a reference ground, a first output switch coupled between the energy storage component and a first output terminal, a second output switch coupled between the energy storage component and a second output terminal, and a control circuit, wherein the first output terminal produces a first output voltage to supply power for a first LED array, the second output terminal produces a second output voltage to supply power for a second LED array, the control circuit controls a duty cycle of the first output switch according to voltages at cathode terminals of multiple LED strings in the LED array and controls a duty cycle of the second output switch according to voltages at cathode terminals of multiple LED strings in the second LED array.
    Type: Grant
    Filed: June 20, 2017
    Date of Patent: October 2, 2018
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Bairen Liu
  • Method for fabricating LDMOS with self-aligned body
    Patent number: 10090409
    Abstract: A method for fabricating a LDMOS device, including: forming a semiconductor substrate; forming a dielectric layer atop the semiconductor substrate and an electric conducting layer on the dielectric layer; forming a first photoresist layer on the electric conducting layer; patterning the first photoresist layer through a first mask to form a first opening; etching the electric conducting layer through the first opening; implanting dopants of a first doping type into the semiconductor substrate through the first opening to form a first body region adjacent to the surface of the semiconductor substrate, and a second body region located beneath the first body region; removing the first photoresist layer; etching the electric conducting layer using a second photoresist layer and a second mask.
    Type: Grant
    Filed: September 28, 2016
    Date of Patent: October 2, 2018
    Assignee: Monolithic Power Systems, Inc.
    Inventors: Joel M. McGregor, Deming Xiao, Zeqiang Yao, Ji-Hyoung Yoo, Jeesung Jung
  • Semiconductor device reducing parasitic loop inductance of system
    Patent number: 10083930
    Abstract: A semiconductor device reducing parasitic loop inductance of system for the switching converter. The semiconductor device has an input voltage pin, a ground reference pin, a switching pin, and a semiconductor die, wherein the semiconductor die comprises a high-side power switch and a low-side power switch and a metal connection. The metal connection directly connects the high-side power switch and the first terminal of the low-side power switch, and is along and proximity to an edge of the semiconductor device to which the input voltage pin is distributed.
    Type: Grant
    Filed: January 20, 2017
    Date of Patent: September 25, 2018
    Assignee: Monolithic Power Systems, Inc.
    Inventors: Huaifeng Wang, Eric Braun, Hunt Hang Jiang, Francis Yu
  • High voltage current source with short circuit protection
    Patent number: 10079542
    Abstract: A current source generating a charging current and a supply voltage by charging a capacitor with the charging current. The current source has a conversion circuit converting a line voltage into a second voltage, a current generation circuit generating the charging current based on the second voltage, and a control circuit controlling the current generation circuit based on the supply voltage. The charging current is controlled to be at a first current value when the supply voltage is lower than a first threshold voltage, the charging current is controlled to be at a second current value when the supply voltage is higher than a second threshold voltage. The first threshold voltage is lower than the second threshold voltage, and the first current value is lower than the second current value.
    Type: Grant
    Filed: November 24, 2015
    Date of Patent: September 18, 2018
    Assignee: Monolithic Power Systems, Inc.
    Inventors: Bin Xiao, Yuedong Chen
  • Buck-boost power converter and associated mode transition control module
    Patent number: 10075075
    Abstract: A buck-boost power converter and a mode transition control module. The mode transition control module includes a buck duty cycle sensing and comparison circuit and a boost duty cycle sensing and comparison circuit. The buck duty cycle sensing and comparison circuit can provide a first mode transition control signal through comparing a first signal indicative of a buck duty cycle with a first threshold signal indicative of a buck duty threshold to regulate the buck-boost power converter to transit between a buck mode and a buck-boost mode. The boost duty cycle sensing and comparison circuit can provide a second mode transition control signal through comparing a second signal indicative of a boost duty cycle with a second threshold signal indicative of a boost duty threshold to regulate the buck-boost power converter to transit between a the buck-boost mode and a boost mode.
    Type: Grant
    Filed: December 23, 2015
    Date of Patent: September 11, 2018
    Assignee: Chengdu Monolithic Power Systems, Co. Ltd.
    Inventor: Jian Zhang
  • Control circuit for maintaining a switching frequency for constant on time converter
    Patent number: 10075078
    Abstract: A control circuit for a switching power converter is disclosed. The control circuit may comprise an OFF control signal generation module configured to generate an OFF control signal having an inactive logic state and an active logic state. The control circuit is configured to turn OFF a main switch of the switching power converter in response to the active logic state. The OFF control signal generation module can regulate an ON time of the main switch through regulating a change of the OFF control signal from the inactive logic state to the active logic state based on a first capacitor voltage across a first capacitor to maintain a switching frequency of the main switch substantially constant. The first capacitor is charged in a predetermined time since the main switch is turned ON and discharged after the predetermined time.
    Type: Grant
    Filed: January 29, 2016
    Date of Patent: September 11, 2018
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Yike Li
  • Synchronous switching converter and associated integrated semiconductor device
    Patent number: 10069422
    Abstract: A synchronous switching converter has an integrated semiconductor device. The integrated semiconductor device has a first semiconductor component and a second semiconductor component coupled in parallel. The first semiconductor component has MOSFET cells with body diodes, and the second semiconductor component has diode cells or MOSFET cells with a low forward voltage. Cells of the second semiconductor component distribute among the first semiconductor component unevenly according to a distribution of a current flowing through the integrated semiconductor device.
    Type: Grant
    Filed: March 2, 2017
    Date of Patent: September 4, 2018
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Huaifeng Wang, Eric Braun
  • Buck-boost battery charging circuit, control circuit and associated control method
    Patent number: 10063078
    Abstract: A battery charging circuit has a first switching circuit and a second switching circuit coupled in parallel between an input port and a node, a first switch coupled between the node and a system ground, a second switch coupled between the node and an output port, and a control circuit. When an input voltage is higher than a system voltage, the control circuit controls the first switching circuit and the second switching circuit turned ON and OFF with interleaving, the first switch maintains OFF and the second switch maintains ON. When the input voltage is lower than the system voltage, the control circuit controls the first switch and the second switch turned ON and OFF, and at least one of the first switching circuit and the second switching circuit maintains ON.
    Type: Grant
    Filed: December 21, 2016
    Date of Patent: August 28, 2018
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Min Xu, Qiming Zhao
  • Over-voltage protection circuit and associated method
    Patent number: 10050615
    Abstract: An over-voltage protection circuit for a transistor switch has an error detecting circuit, a dummy load circuit and a driving circuit. The error detecting circuit has a first input terminal; and a second input terminal configured to receive a reference signal. The dummy load circuit is configured to establish a conductive path between the output terminal of the transistor switch and ground. The driving circuit is configured to increase the on-resistance of the transistor switch if the voltage difference between the second terminal of the error detecting circuit and the first terminal of the error detecting circuit is smaller than a calculated value.
    Type: Grant
    Filed: December 1, 2015
    Date of Patent: August 14, 2018
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Chandler Chen
  • Two-channel LED driver with short circuit protection and short circuit protection method for two-channel LED driver
    Patent number: 10021754
    Abstract: A two-channel LED driver with short circuit protection is discussed. A short process circuit monitors a short condition of the LED driver, and locks the short status if short circuit occurs at either one of or both of the channels.
    Type: Grant
    Filed: November 6, 2017
    Date of Patent: July 10, 2018
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Naixing Kuang, Kai Wang
  • Auto calibration method used in constant on-time switching converter
    Patent number: 10020734
    Abstract: An auto calibration method used in switching converters with constant on-time control. The auto calibration method includes: generating a periodical clock signal with a predetermined duty cycle; providing a first voltage and a second voltage to an on-time control circuit to generate an on-time control signal based on the first and second voltage; providing the clock signal and on-time control signal to a logic circuit to generate a switch control signal based on the clock signal and on-time control signal; comparing the duty cycle of the switch control signal with the duty cycle of the clock signal to adjust a calibration code signal; and adjusting circuit parameters of the on-time control circuit in accordance with the calibration code signal.
    Type: Grant
    Filed: June 26, 2017
    Date of Patent: July 10, 2018
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Changxian Zhong
  • VID-controlled voltage regulator with audible noise correction
    Patent number: 10003255
    Abstract: A method for correcting audible noise from a voltage regulator due to a change of a VID indicated by a series of VID commands. A VID difference between a current value and a target value of the VID is compared with a VID threshold when a VID command for changing the VID from the current value to the target value is received. The VID is held at the current value if the VID difference is larger than the VID threshold. And the VID command is executed if a holding duration for holding the VID at the current value expires and no new VID command for changing the VID is received before the expiration of the holding duration.
    Type: Grant
    Filed: December 19, 2016
    Date of Patent: June 19, 2018
    Assignee: Monolithic Power Systems, Inc.
    Inventors: Jeffrey Jull, Qian Li
  • Single inductor dual output voltage converter and the method thereof
    Patent number: 9998005
    Abstract: A voltage converter provides a positive voltage and a negative voltage with a single inductor. The voltage converter has a first switch, a second switch, a third switch and a fourth switch switched periodically, wherein each switching period comprise a first time period, a second time period and a third time period, and wherein: during the first time period, the first switch and the fourth switch are turned on, whereas the second switch and the third switch are turned off; during the second time period, the first switch and the third switch are turned on, whereas the second switch and the fourth switch are turned off; and during the third time period, the second switch and the fourth switch are turned on, whereas the first switch and the third switch are turned off.
    Type: Grant
    Filed: March 30, 2017
    Date of Patent: June 12, 2018
    Assignee: Monolithic Power Systems, Inc.
    Inventors: Bairen Liu, Licheng Sheng, Bo Yu
  • Clock circuit and control method thereof
    Patent number: 9998127
    Abstract: A clock circuit and control method thereof to avoid missing the clock signal generated by the clock circuit when the generated clock signal is synced with an external clock signal, wherein the clock circuit comprises a current compensation circuit and a current control circuit. The clock signal is generated by alternately charging and discharging a capacitor with a charging current based on a sync current and a compensating current when an external clock signal is detected. The compensating current is generated based on a frequency of the external clock signal, and the sync current is provided based on a phase difference between the generated clock signal by the clock circuit and the external clock signal.
    Type: Grant
    Filed: March 20, 2017
    Date of Patent: June 12, 2018
    Assignee: Monolithic Power Systems, Inc.
    Inventor: Lei Li