Texas Instruments Corporation

Devrim Yilmaz Aksin

Mohammad A Al-Shyoukh

Marcus Marchesi Martins

A low drop-out voltage regulator having soft-start. A low drop-out regulator circuit is provided having an input node, an output node, a power FET connected by a source and drain between the input node and the output node, and a feedback circuit having an output connected and providing a control signal to a gate of the power FET. A current limit circuit is configured to control the power FET to limit the current through it when the voltage across a controllable sense resistor connected to conduct a current representing the current through the power FET exceeds a predetermined limit value. At start-up, control unit provides a control signal to the controllable resistor to cause the resistance value of the controllable resistor to decrease incrementally in value at respective predetermined incremental times during a predetermined time interval.

Soft-start circuit and method for low-dropout voltage regulators

A bootstrapped circuit for sampling inputs with a signal range greater than supply voltage includes: a bootstrapped switch coupled between an input node and an output node; a first transistor coupled to a control node of the bootstrapped switch; a first capacitor having a first end coupled to the first transistor; a second transistor coupled between the first transistor and a supply node, and having a control node coupled to a first clock signal node; a third transistor coupled between the first transistor and the supply node; a charge pump having an output coupled to a control node of the third transistor; a level shifter coupled to a second end of the first capacitor; a fourth transistor coupled between the supply node and a control node of the first transistor; and a fifth transistor coupled between the control node of the fourth transistor and the output of the charge pump and, having a control node coupled to the supply node; wherein the second end of the first capacitor can be charged to an input voltage.

Bootstrapped switch for sampling inputs with a signal range greater than supply voltage

The bootstrapping circuit capable of sampling inputs beyond supply voltage includes: a bootstrapped switch MNcoupled between an input node and an output node; a first transistor MPhaving a first end coupled to a control node of the bootstrapped switch MNa clock bootstrapped capacitor Chaving a first end coupled to a second end of the first transistor MPa second transistor MNcoupled between the first end of the first transistor MPand a supply node, and having a control node coupled to a first clock signal node PHI; a third transistor MNcoupled between the second end of the first transistor MPand the supply node; a charge pump having a first output coupled to a control node of the third transistor MNa level shifter having a first output coupled to a second end of the clock bootstrapped capacitor Ca fourth transistor MNcoupled between the supply node and a control node of the first transistor MPand having a control node coupled to a second output of the charge pump; a capacitor coupled between a second output of the level shifter and a control node of the first transistor; and a fifth transistor MNcoupled between the control node of the bootstrapped switch MNand a common node.

Bootstrapping circuit capable of sampling inputs beyond supply voltage

An analog-to-digital converter device capable of measuring inputs beyond a supply voltage including: an N bit analog-to-digital converter powered by a supply voltage and a reference voltage; a range resolution stage capable of receiving inputs at higher voltages than the supply voltage, providing an input to the analog-to-digital converter, and outputting a logic value of one for the N+1th bit in response to an input signal higher than the reference voltage; and a bootstrapped input multiplexer stage for connecting low voltage input signals directly to the analog-to-digital converter and for connecting input signals that can exceed the supply voltage to the range resolution stage.

Analog-to-digital converter with input signal range greater than supply voltage and extended dynamic range

A bootstrapping circuit capable of sampling inputs beyond a supply voltage which includes a bootstrapped switch coupled between an input node and an output node, a first transistor having a first end coupled to a control node of the bootstrapped switch, a first capacitor having a first end coupled to a second end of the first transistor, a second transistor coupled between the first end of the first transistor and a supply node, and having a control node coupled to a first clock signal node, a third transistor coupled between the second end of the first transistor and the supply node, a charge pump having an output coupled to a control node of the third transistor, a level shifter having an output coupled to a second end of the first capacitor, a fourth transistor cross-coupled with, the first transistor, a fifth transistor having a second end coupled to the first end of the fourth transistor, and having a control node coupled to the output of the level shifter, and a sixth transistor coupled between the first end of the fifth transistor and a common node and having a control node coupled to the first clock signal node.

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Dallas, TX, United States of America

Devrim Yilmaz Aksin