Patents Assigned to Monolithic Power Systems
  • High side DMOS and the method for forming thereof
    Patent number: 9159795
    Abstract: A high side DMOS provides high breakdown voltage with small termination area. The high side DMOS has three parts which may comprise a stair-field plate in the termination part of the poly gate.
    Type: Grant
    Filed: June 28, 2013
    Date of Patent: October 13, 2015
    Assignee: Monolithic Power Systems, Inc.
    Inventors: Ji-Hyoung Yoo, Lei Zhang, Daping Fu, Yanjie Lian
  • MULTI-PHASE SMPS WITH LOOP PHASE CLOCKS AND CONTROL METHOD THEREOF
    Publication number: 20150280560
    Abstract: A multi-phase SMPS has N switching circuits; a setting signal generator generating a setting signal based on an output signal of the SMPS; a clock signal generator generating a system clock signal; and a controller receiving the setting signal and the system clock signal, the controller generating N shifted phase clock signals according to the system clock signal, and the N shifted phase clock signals forming loop phase clocks, and the controller further generates N switching control signals based on the setting signal and the N shifted phase clock signals.
    Type: Application
    Filed: March 31, 2014
    Publication date: October 1, 2015
    Applicant: MONOLITHIC POWER SYSTEMS, INC.
    Inventor: Yanchuan Guo
  • Discharge circuits for EMI filters capacitors and methods thereof
    Patent number: 9148049
    Abstract: A discharge circuit for an EMI filter capacitor, wherein the EMI filter capacitor is coupled between input terminals of a switching converter. The discharge circuit has a detecting circuit and a current source. The detecting circuit is configured to detect whether an electrical source is coupled to the input terminals of the switching converter. The current source is coupled between the input terminals of the switching converter and a power supply capacitor, and is configured to provide a power supply voltage across the power supply capacitor. When the electrical source is uncoupled from the input terminals of the switching converter, the EMI filter capacitor is discharged by the current source.
    Type: Grant
    Filed: March 11, 2013
    Date of Patent: September 29, 2015
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: En Li
  • Power factor correction circuit, the control circuit and the method thereof
    Patent number: 9130473
    Abstract: A power factor correction circuit including a rectifier bridge, an energy storage component, a power switch, a second switch and a control circuit provides reduced THD and improved PF performance under a high input AC voltage.
    Type: Grant
    Filed: June 27, 2013
    Date of Patent: September 8, 2015
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Sicong Lin, Lianfeng Ding, Zhengxing Li
  • Switching power converter and control method thereof
    Patent number: 9118258
    Abstract: A switching power converter with an input terminal configured to receive a first input voltage; an output terminal configured to provide an output current to a load, wherein the output current has a peak value and an average value; a power switch; a first loop coupled to the input terminal, wherein the first loop configured to generate a first output signal based on the first input voltage; a second loop configured to generate a second output signal based on the output current; a multiplier configured to generate a multiplying signal based on multiplying the first output signal with the second output signal; and a driving circuit configured to generate a driving signal based on the multiplying signal to control the power switch, so as to reduce the ratio between the peak value and the average value of the output current.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: August 25, 2015
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Yike Li, Paul Ueunten
  • High side buck converters and control methods thereof
    Patent number: 9106131
    Abstract: A high side buck converter includes a high side transistor, a low side transistor, a sensor, a sensing window generator, an error amplifier, a first comparator and an on-time signal generator. The high side and low side transistors are coupled together to form a switch node which is used as the reference ground of the controller. The sensor senses the output voltage and generates a sensing signal. The sensing window generator generates a sensing window signal. The error amplifier amplifies the error between a feedback signal of the sensing signal and a reference signal during the sensing window, and generates an error signal. The first comparator compares the feedback signal with the error signal and generates a first comparison signal. The on-time signal generator generates an on-time signal based on the first comparison signal, so as to control the high side and low side transistors.
    Type: Grant
    Filed: August 9, 2013
    Date of Patent: August 11, 2015
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Yike Li, Li Xu, Rui Wang
  • CURRENT DETECTION AND EMULATION CIRCUIT, AND METHOD THEREOF
    Publication number: 20150222171
    Abstract: A current detection circuit for detecting a current in a SMPS which has a first switch and a second switch; a current sensing circuit sensing a second switch current flowing through the second switch and providing a current sensing signal; and a current emulation circuit which generates a first current according to the current sensing signal and generate a second current according to the first current source, and the current emulation circuit further providing a current emulation signal based on the first current source and the second current source; wherein a current detection signal during a first period is proportional to the current emulation signal, and the current detection signal during a second period is proportional to the current sensing signal.
    Type: Application
    Filed: January 31, 2014
    Publication date: August 6, 2015
    Applicant: MONOLITHIC POWER SYSTEMS, INC.
    Inventors: James H. Nguyen, Francis C. Yu
  • Power converter with voltage window and the method thereof
    Patent number: 9093903
    Abstract: The present disclosure discloses a power converter providing a low output voltage from an offline AC. The power converter defines a voltage window for the input AC signal. Inside the voltage window, the rectified DC waveform is passed through to the output and the storage capacitor; outside the voltage window, the power converter is idle (or the output is blocked from input) and let the output storage capacitor alone supply the load.
    Type: Grant
    Filed: September 28, 2011
    Date of Patent: July 28, 2015
    Assignee: Monolithic Power Systems, Inc.
    Inventors: Rajesh Swaminathan, Joseph Urienza
  • Switching mode power supply and the method thereof
    Patent number: 9093909
    Abstract: A switching mode power supply, having: an input port; an output port; an energy storage component and a pair of power switches coupled between input port and the output port; an error amplifier configured to generate an amplified error signal based on the feedback signal and the reference signal; an error comparator configured to generate a frequency control signal based on the amplified error signal and the first sawtooth signal; a peak current generator configured to generate a peak current signal based on the frequency control signal; a peak current comparator configured to generate a current limit signal based on the peak current signal and the current sense signal; and a logic circuit configured to generate a switching signal to control the power switches based on the frequency control signal and the current limit signal.
    Type: Grant
    Filed: May 7, 2013
    Date of Patent: July 28, 2015
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Siran Wang, Junming Zhang, Yuancheng Ren
  • LDMOS device with short channel and associated fabrication method
    Patent number: 9087774
    Abstract: A method of fabricating an LDMOS device includes: forming a gate of the LDMOS device on a semiconductor substrate; performing tilt body implantation by implanting dopants of a first conductivity type in the semiconductor substrate using a mask, wherein the tilt body implantation is implanted at an angle from a vertical direction; performing zero tilt body implantation by implanting dopants of the first conductivity type using the same mask, wherein the zero tilt body implantation is implanted with zero tilt from the vertical direction, and wherein the tilt body implantation and the zero tilt body implantation are configured to form a body region of the LDMOS device; and forming a source region and a drain contact region of the LDMOS device, wherein the source region and the drain contact region are of a second conductivity type.
    Type: Grant
    Filed: September 26, 2013
    Date of Patent: July 21, 2015
    Assignee: Monolithic Power Systems, Inc.
    Inventors: Jeesung Jung, Joel M. McGregor, Ji-Hyoung Yoo
  • Constant on time multi-phase switching converter and control method thereof
    Patent number: 9081397
    Abstract: A multi-phase switching converter comprising a plurality of switching circuits, a comparing circuit and a control circuit. The comparing circuit generates a comparison signal based on a reference signal and the output voltage of the multi-phase switching converter. The control circuit can turn on the following switching circuit based on the comparison signal only after the time from the current switching circuit being turned on reaches a first time threshold or the off-time of the current switching circuit reaches a second time threshold, wherein the first time threshold is longer than the second time threshold.
    Type: Grant
    Filed: December 11, 2012
    Date of Patent: July 14, 2015
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Lijie Jiang, Qian Ouyang, Xiaokang Wu, Bo Zhang, Suhua Luo, Yuancheng Ren, Eric Yang
  • Switching power supply with optimized THD and control method thereof
    Patent number: 9083245
    Abstract: A switching power supply comprising a switching circuit and a controller. The controller comprises a preprocessing circuit, a first multiplier, a first comparing circuit and a logic circuit. The controller comprises a preprocessing circuit, a first multiplier, a first comparing circuit and a logic circuit. The preprocessing circuit generates a first multiplication input signal based on the input voltage and output voltage of the switching circuit. The first multiplier multiplies the first multiplication input signal by a second multiplication input signal and generates a first product signal. The first comparing circuit compares a current sensing signal representative of the input current with the first product signal and generates a first comparison signal. The logic circuit turns off a main switch in the switching circuit when the current sensing signal is larger than the first product signal.
    Type: Grant
    Filed: August 15, 2012
    Date of Patent: July 14, 2015
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Qiming Zhao, Fei Xiong, Jianyu Xie, Xue Jiang, Yimin Liang
  • HIGH VOLTAGE PMOS AND THE METHOD FOR FORMING THEREOF
    Publication number: 20150187931
    Abstract: A high voltage PMOS replacing the lightly doped region of the drain region with a low voltage P-well adopted in the low voltage devices, so as to save a mask. In order to achieve the high breakdown voltage and the low on resistance, a thick gate oxide applied in the DMOS is inserted. The N-type well region surrounding the source region may be replaced by a low voltage N-well adopted in the low voltage device to further save a mask.
    Type: Application
    Filed: December 27, 2013
    Publication date: July 2, 2015
    Applicant: Monolithic Power Systems, Inc.
    Inventors: Ji-Hyoung Yoo, Yanjie Lian
  • Microelectronic flip chip packages with solder wetting pads and associated methods of manufacturing
    Patent number: 9070671
    Abstract: Processes of assembling microelectronic packages with lead frames and/or other suitable substrates are described herein. In one embodiment, a method for fabricating a semiconductor assembly includes forming an attachment area and a non-attachment area on a lead finger of a lead frame. The attachment area is more wettable to the solder ball than the non-attachment area during reflow. The method also includes contacting a solder ball carried by a semiconductor die with the attachment area of the lead finger, reflowing the solder ball while the solder ball is in contact with the attachment area of the lead finger, and controllably collapsing the solder ball to establish an electrical connection between the semiconductor die and the lead finger of the lead frame.
    Type: Grant
    Filed: September 9, 2014
    Date of Patent: June 30, 2015
    Assignee: Monolithic Power Systems, Inc.
    Inventor: Hunt Hang Jiang
  • Multi-phase SMPS with load transient control and associated control method
    Patent number: 9071142
    Abstract: The present invention discloses a multi-phase switch-mode power supply (SMPS). The multi-phase SMPS may comprise a plurality of comparing circuits and a controller. Wherein each comparing circuit comprises a first input coupled to a threshold voltage, a second input coupled to a feedback signal of the output voltage, and an output configured to provide a load indication signal. The controller may have a plurality of inputs coupled to the outputs of the comparing circuit, and a plurality of outputs configured to provide control signals for driving a plurality of switches of the multi-phase SMPS. And the controller is configured to selectively turn on a plurality of the switches according to the load indication signals.
    Type: Grant
    Filed: June 22, 2012
    Date of Patent: June 30, 2015
    Assignee: Monolithic Power Systems, Inc.
    Inventors: Eric Yang, Lijie Jiang, Qian Ouyang, Xiaokang Wu, Bo Zhang
  • Isolated switching mode power supply and the method thereof
    Patent number: 9065348
    Abstract: An isolated switching mode power supply, having: a transformer having a primary winding, a secondary winding and a third winding; a current limit comparator configured to provide a current limit signal based on the current sense signal and the peak current signal; a logic circuit configured to provide a logic control signal based on the frequency control signal and the current limit signal; a startup control circuit configured to generate a startup control signal based on the current sense signal; a load detecting circuit configured to provide a load detecting signal based on the second feedback signal and the switching signal; and a selector configured to provide the logic control signal or the startup control signal based on the load detecting signal.
    Type: Grant
    Filed: May 7, 2013
    Date of Patent: June 23, 2015
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Siran Wang, Junming Zhang, Yuancheng Ren
  • A SWITCHING CIRCUIT AND THE METHOD THEREOF
    Publication number: 20150171855
    Abstract: A switching circuit having a low side driver providing a three-level low side drive signal keeps a low side power switch slightly on during a dead time between the low side power switch turn off and a high side power switch turn on, thus a current flowing through a body diode is mostly distributed to the slightly on low side power switch instead of the body diode.
    Type: Application
    Filed: December 13, 2013
    Publication date: June 18, 2015
    Applicant: Monolithic Power Systems, Inc.
    Inventor: Eric Braun
  • Power device with integrated Schottky diode and method for making the same
    Patent number: 9059329
    Abstract: The present invention discloses a power device with integrated power transistor and Schottky diode and a method for making the same. The power device comprises a power transistor having a drain region, a Schottky diode in the drain region of the power transistor, and a trench-barrier near the Schottky diode. The trench-barrier is provided to reduce a reverse leakage current of the Schottky diode and minimizes the possibility of introducing undesired parasitic bipolar junction transistor in the power device.
    Type: Grant
    Filed: August 22, 2011
    Date of Patent: June 16, 2015
    Assignee: Monolithic Power Systems, Inc.
    Inventor: Donald R. Disney
  • Class D audio amplifier with noise suppression and the method thereof
    Patent number: 9059667
    Abstract: A class D audio amplifier having: an audio control circuit configured to provide a switching signal based on an input signal and a reference signal; an input capacitor coupled between the input signal and the first input terminal of the audio control circuit; an inductor having a first terminal coupled to the switching terminal of the audio control circuit, and a second terminal; an output capacitor having a first terminal coupled to second terminal of the inductor and a second terminal coupled to a load; and a noise suppression circuit having a first terminal coupled to the first input terminal of the audio control circuit, and a second terminal coupled to the switching terminal of the audio control circuit, wherein the noise suppression circuit charges the input capacitor and the output capacitor to reach a preset value.
    Type: Grant
    Filed: April 5, 2013
    Date of Patent: June 16, 2015
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Yunping Lang, Li Lian
  • Energy harvest system and the method thereof
    Patent number: 9059633
    Abstract: The present disclosure discloses an energy harvest system converting an AC source provided by an energy harvester to a desired voltage. The AC source is boosted to the desired voltage by a bi-directional booster converter comprising fourth controllable transistors configured in an H-bridge, and stored by a storage capacitor. The desired voltage is then used to power various loads.
    Type: Grant
    Filed: December 21, 2011
    Date of Patent: June 16, 2015
    Assignee: Monolithic Power Systems, Inc.
    Inventor: Eric Yang