Freescale Semiconductor,inc.

Micrel, Incorporated

Semiconductor Components Industries, LLC

Eduardo Velarde

Ira G Miller

Brett Jason Thompsen

Thomas Duffy

Han Zou

In one embodiment, a power supply controller may be formed including configuring the power supply controller to use an error signal and a ramp signal to control a duty cycle of a switching control signal that is configured to control first and second switches to charge a battery, and configuring the power supply controller to selectively offset a dc value of the ramp signal responsively to detecting the adapter current is greater than a first value wherein offsetting the dc value of the ramp signal changes the duty cycle of the switching control signal to supply current from the battery to a load.

Method of forming a power supply controller and structure therefor

A current sense device for a power transistor is described. The power transistor is formed in a cellular structure including a cellular array of transistor cells. The current sense device includes multiple transistor cells in the cellular array of transistor cells of the power transistor being used as sense transistor cells. The sense transistor cells are evenly distributed throughout the cellular array where the source terminal of each sense transistor cell is electrically connected to a first node through a metal line in the first metal layer and through a metal line in the second metal layer where the metal lines are electrically isolated from the metal lines connecting the transistor cells of the power transistor. The sense transistor cells measure a small portion of the current flowing through the power transistor based on the size ratio of the current sense device and the power transistor.

Current sensing in a buck-boost switching regulator using integrally embedded PMOS devices

Methods and apparatus for softstarting a voltage regulation circuit. A circuit for generating an output voltage at an output thereof includes a capacitor having a first terminal configured to be coupled to a reference potential and having a second terminal coupled to the output, and a switchable current source coupled to the capacitor for intermittently charging the capacitor until the output voltage is reached.

Clocked ramp apparatus for voltage regulator softstart and method for softstarting voltage regulators

A PWM regulator is operated either a buck mode or a boost mode depending on whether the input voltage is above or below the desired regulated output voltage. The technique uses two sawtooth ramps 180 degrees out of phase. Where the two ramps cross each other is a buck/boost transition level. An error voltage, corresponding to a required duty cycle to achieve a regulated voltage, is compared to the two ramps. The transition from one mode to the other occurs when the error voltage passes the buck/boost transition level of the two ramps. A logic circuit supplies PWM pulses to either buck switching transistors or the boost switching transistors in a power stage of the regulator, depending on the whether the error voltage is above or below the buck/boost transition level, to achieve the regulated voltage.

Buck-boost control logic for PWM regulator

A circuit () is used to perform voltage regulation. In one embodiment, a voltage regulator () is used in conjunction with an output transistor () to form a circuit () which operates to regulate the voltage drop from a first node () to a second node (). This second node () may be used to provide power to circuitry (). The areas of several transistors () in circuit () may be adjusted so that negative and positive temperature coefficients may be balanced such that the circuit () behaves as desired over a range of voltages and temperatures. Note that in one embodiment, circuit () is a 2-terminal device.

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Chandler, AZ, United States of America

Eduardo Velarde