Monolithic Power Systems Patent Grants

Semiconductor device having conductive bump with improved reliability

Granted: September 19, 2017
Patent Number: 9768135
The present disclosure discloses a semiconductor device having conductive bumps formed on a conductive redistribution layer and associated method for manufacturing. The semiconductor device may further include a first type shallow trench formed on a passivation layer overlying a semiconductor substrate. The conductive redistribution layer is formed in the first type shallow trench. A polyimide layer may be formed between neighboring conductive redistribution layers should a plurality of…

Copper structures with intermetallic coating for integrated circuit chips

Granted: September 5, 2017
Patent Number: 9754909
An integrated circuit (IC) chip includes a copper structure with an intermetallic coating on the surface. The IC chip includes a substrate with an integrated circuit. A metal pad electrically connects to the integrated circuit. The copper structure electrically connects to the metal pad. A solder bump is disposed on the copper structure. The surface of the copper structure has a coating of intermetallic. The copper structure can be a redistribution layer and a copper pillar that is…

Current balance circuit and the method thereof

Granted: August 15, 2017
Patent Number: 9734917
A current balance circuit for a power management device having a first current channel and a second current channel, having: a first current sense circuit configured to detect a current flowing through the first current channel, and to provide a first current sense signal indicative of the current flowing through the first current channel; wherein the current balance circuit draws current from the second current channel to the first current channel based on the first current sense…

Switching converter with constant on-time controller thereof

Granted: July 25, 2017
Patent Number: 9716432
A control circuit for controlling a switching circuit has a ramp compensation circuit, a DC calibration circuit, a comparison circuit and a logic circuit. The ramp compensation circuit generates a ramp compensation signal. The DC calibration circuit generates a DC calibration signal by sampling and holding the ramp compensation signal. The comparison circuit generates a comparison signal according to the ramp compensation signal, a feedback signal representative of an output voltage of…

Power bank circuit and the method thereof

Granted: July 18, 2017
Patent Number: 9711975
A power bank circuit controlling power switches to operate at different modes in accordance with different external coupling situations is discussed. The power bank circuit may be coupled to either a power source, a digital device, or a plurality of series coupled batteries at a high voltage port; and may be coupled to either a power source, a digital device, or a single battery at a low voltage port.

Digitally calibrated voltage regulators for power management

Granted: June 20, 2017
Patent Number: 9684745
A computer provides a graphical user interface for displaying a virtual representation of a voltage regulator and for accepting a user requirement for the voltage regulator. The computer automatically determines an internal calibration setting of the voltage regulator that meets the user requirement. The computer simulates operation of the voltage regulator as calibrated with the internal calibration setting. The internal calibration setting is downloaded to the voltage regulator. A…

Switching controller with reduced inductor peak-to-peak ripple current variation

Granted: May 23, 2017
Patent Number: 9660516
A switching controller having an over voltage protection circuit is disclosed. The over voltage protection circuit detects whether the output voltage is higher than an over voltage threshold and turns on the rectifier when the output voltage is higher than an over voltage threshold. The over voltage protection circuit detects whether a current flowing through a rectifier is lower than a negative current limit and further turns off the rectifier for a time period when the current flowing…

Control circuit for multiphase switching converter to reduce overshoot and associated control method

Granted: May 23, 2017
Patent Number: 9660534
A multiphase switching converter having a plurality of switching circuits and a control circuit, the plurality of switching circuits provide an output voltage, the control circuit provides a plurality of switching control signals to turn ON the plurality of switching circuits successively based on the output voltage and a reference signal, when the output voltage is detected overshooting, the control circuit turns OFF a current switching circuit, and when the output voltage is detected…

Constant on-time switching converter with adaptive ramp compensation and control method thereof

Granted: May 16, 2017
Patent Number: 9653992
A COT switching converter includes a first switch, a second switch, an inductor, an on-time control circuit configured to generate an on-time control signal, a ramp compensation generator configured to generate a compensation signal, a comparing circuit, a logic circuit, a driving circuit and a feed forward circuit configured to generate a compensation control signal based on the input voltage of the switching circuit. The comparing circuit compares the sum of the compensation signal and…

Constant on time switching converter with DC calibration

Granted: May 9, 2017
Patent Number: 9647552
A reference compensating circuit used in a COT control circuit. The reference compensating circuit has an error amplifier, a first current sink, a resistor, a second current sink, a current source and a capacitor. The error amplifier amplifies the difference between a reference signal and a feedback signal and generates an error signal. Based on the error signal, the first current sink generates a current flowing out from a node of the reference compensating circuit. The resistor…

Switching power converter, clock module, control circuit and associated control method

Granted: May 2, 2017
Patent Number: 9641085
A power converter having a clock module and a method for controlling a clock signal of the power converter. The clock module is configured to provide the clock signal and to set a clock frequency of the clock signal to a first predetermined frequency at the moment when the power converter is powered on. The clock module is further configured to regulate the clock frequency to increase from the first predetermined frequency to a second predetermined frequency through a predetermined times…

Multi-mode power converter and associated control method

Granted: April 25, 2017
Patent Number: 9634570
A multi-mode power converter and associated method for configuring and controlling a multi-mode power converter. The multi-mode power converter may have a boost operation mode and a buck operation mode. A first transistor is coupled between a switching terminal and a ground, and a second transistor and a third transistor are coupled in series between the switching terminal and an output port of the multi-mode power converter. In the buck mode, an on-resistance of the second transistor is…

Switching mode power supply and the controller and the method thereof

Granted: April 25, 2017
Patent Number: 9634572
A switching mode power supply with resonant technology. The switching mode power supply current uses current polarity evaluation to avoid capacitive mode by triggering the capacitive protection if the evaluation indicates that the system will enter capacitive mode.

Digitally controlled PFC converter with multiple discontinuous modes

Granted: April 11, 2017
Patent Number: 9621028
A PFC circuit having a switching circuit and a control circuit, the control circuit controls an operation mode of the switching circuit based on an input current and a switching frequency of the switching circuit, when the switching circuit works under a continuous current mode, the switching circuit is turned ON when the input current is less than an OFF current reference signal, and when the switching circuit works under a first discontinuous mode or a second discontinuous mode, the…

Digital isolator and the method thereof

Granted: April 11, 2017
Patent Number: 9621383
An isolator system has a transmitter configured to generate a first pair of buffered differential signals base based on an input signal; an isolation barrier having an input side coupled to the transmitter to receive the first pair of buffered differential signals, and an output side configured to provide a second pair of differential signals; and a receiver coupled to the output side of isolation barrier to receive the second pair of differential signals, wherein the receiver provides…

Trans-conductance regulation circuit, trans-conductance error amplifier and power converter

Granted: March 28, 2017
Patent Number: 9606566
A trans-conductance regulation circuit, a trans-conductance error amplifier module and a power converter. The trans-conductance regulation circuit provides a bias current at least partially based on an output voltage of the power converter. The bias current is sent to bias a trans-conductance operational amplifier in the trans-conductance error amplifier module so that a trans-conductance of the trans-conductance operational amplifier is direct proportional to the output voltage of the…

Switching converter with controllable restart delay and associated control method

Granted: March 28, 2017
Patent Number: 9608509
A switching converter providing an output voltage has a first switch and a control circuit. The control circuit provides an auxiliary power supply voltage, and a switching control signal to control the first switch based on the output voltage and a reference signal. The switching converter is shut down by the control circuit when a fault happens, and the switching converter restarts when the auxiliary power supply voltage decreases to a first threshold.

Switching regulator and the method thereof

Granted: March 28, 2017
Patent Number: 9608510
A switching regulator uses an over voltage comparator to compare an envelop line signal with a reference wave signal, to detect whether the system is in an over voltage condition. The envelop line signal is indicative of a peak value of an inductor current.

Battery discharge circuit and discharge method with over discharge protection

Granted: March 28, 2017
Patent Number: 9608516
A battery discharge circuit has a switching circuit and a controller. The switching circuit is coupled between a battery and a load. The controller is configured to generate a control signal to control the switching circuit. When the battery voltage drops below a first reference voltage, the controller adjusts the control signal to regulate the battery voltage to be equal to the first reference voltage.

Switching converter with adaptive off time control and the method thereof

Granted: March 28, 2017
Patent Number: 9608519
A switching converter having a power stage with a main switch to convert an input voltage to an output voltage; a current sense circuit generating a current sense signal indicative of a current flowing through the main switch; a PWM generator generating a PWM signal; an OFF time controller generating an OFF time control signal relating to the input voltage and the output voltage; and a logic circuit generating a switching signal based on the OFF time control signal and the PWM signal to…