Texas Instruments Corporation

Sungho Beck

Jae Won Choi

Johnny Klarenbeek

Richard Turkson

Abidur Rahman

Bixia Li

H Pooya Forghani-zadeh

Luis Alberto Huertas-Sanchez

Apparatus, devices, and systems to provide a low quiescent current load switch are disclosed. A disclosed load switch circuit includes a transconductor to convert a voltage to a current input to a transistor gate, the current input to the transistor gate to control the gate to deliver power to a load from a power supply. The example circuit includes a resistor to provide power from a charge pump to the gate as controlled by the transconductor. A disclosed apparatus includes a driver to control a gate of a transistor, the gate to enable the transistor to deliver power to a load from a power supply when the gate is activated, and a gate slope control to control a rate of change over time of a voltage associated with the gate to activate the gate and to disable the driver when the gate is activated.

Low quiescent current load switch

A power source multiplexer includes a first switch circuit connected between a first input voltage source node and an output voltage node. A second switch circuit is connected between a second input voltage source node and the output voltage node. A driver circuit is configured to provide a steady-state current to drive one of the first or second switch circuits to electrically connect the respective input voltage source node to the output voltage node. A boost circuit is configured to boost the steady-state current for a switching time interval when switching from one of the input voltage source nodes being connected to the output node to the other of the input voltage source nodes being connected to the output voltage node.

Power source multiplexer with adaptive switch control

Channel switchover power multiplexer circuits, and methods of operating the same are disclosed. An example power multiplexer a first transistor coupled to a first input, a second transistor coupled to the first transistor to couple a first voltage at the first input to an output, a third transistor coupled to a second input, a fourth transistor coupled to the third transistor to couple a second voltage at the second input to the output, a diode amplifier to provide a third voltage to a gate of the first transistor to block a reverse current, and a soft-start amplifier to provide a fourth voltage to a gate of the fourth transistor to turn on (with adjustable VOUT ramp rate) the fourth transistor with a constant ramp rate.

Channel switchover power multiplexer circuits, and methods of operating the same

A switch for controlling a power supply and a method of operating the switch are disclosed. The switch includes a first transistor having a drain and a source connected between Vand Vand a gate connected to be driven to a first voltage that is greater than V, an external capacitor operable, when connected to the gate of the first transistor, to control a rise time of V, and a circuit coupled to the gate of the first transistor and to the external capacitor, the circuit connected to couple the external capacitor to the gate of the first transistor responsive to an enable signal turning on and to uncouple the external capacitor from the gate of the first transistor responsive to the voltage on the gate reaching the first voltage.

Gate capacitance control in a load switch

One embodiment of the present invention includes a power regulator system. The system includes a power stage configured to provide an output voltage to a load in response to an input voltage and a control signal. The system also includes a feedback system that receives the input voltage and is configured to generate the control signal based on the output voltage. The system further includes a load detector configured to determine a state of the load and to set the power to the feedback system based on determining the state of the load.

Growing community of inventors

Plano, TX, United States of America

Sungho Beck