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Gate capacitance control in a load switch

A gate and switch technology, applied in the field of gate capacitance control, can solve problems such as output voltage output, gate oxide reliability issues, etc.

Active Publication Date: 2018-09-28
TEXAS INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This situation leads to two problems: (a) Gate oxide reliability issues in the transistors controlling the output voltage due to the high gate / source voltage VGS when the external capacitor is not discharged ; and (b) when the input supply ramps up again, there will be an uncontrolled output or spike in the output voltage that can cause problems downstream

Method used

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  • Gate capacitance control in a load switch
  • Gate capacitance control in a load switch
  • Gate capacitance control in a load switch

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Embodiment Construction

[0017] In the figures, the same reference numerals designate similar elements. In this specification, numerous specific details are set forth in order to provide a thorough understanding, but embodiments may be practiced without these specific details. In other instances, known features have not been described in detail to avoid unnecessarily complicating the description.

[0018] In this specification: (a) "coupled" may be used to indicate that two or more elements that may or may not be in direct physical or electrical contact with each other co-operate or interact with each other; and b) "connected" may be used to indicate that The establishment of communication between two or more coupled components, a communication relationship. In general, an element, component or module may be configured to perform a function if the element, component or module is capable of performing or otherwise structurally arranged to perform the function in one or more example embodiments.

[00...

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PUM

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Abstract

In described examples of a switch (200) for controlling a power supply, the switch (200) includes a first transistor (Ml) having a drain and a source connected between VIN and VOUT and a gate connected to be driven to a first voltage that is greater than VIN, an external capacitor (CEXT) operable, when connected to the gate of the first transistor (Ml), to control a rise time of VOUT, and a circuit coupled to the gate of the first transistor (Ml) and to the external capacitor (CEXT). The circuit is connected to couple the external capacitor (CEXT) to the gate of the first transistor (Ml) responsive to an enable signal (EN) turning on and to uncouple the external capacitor (CEXT) from the gate of the first transistor (Ml) responsive to the voltage on the gate reaching the first voltage.

Description

technical field [0001] The present invention relates generally to load switches, and more particularly to control of gate capacitance in load switches. Background technique [0002] Some load switches use an external capacitor connected directly to the gate of the power switch to control the rise time and inrush current to the gate. When the switch is off, the input supply is used to power a circuit that discharges the external capacitor in preparation for the next on-time. When the input supply drops and the switch turns on, there is no power to discharge the external capacitor. This situation leads to two problems: (a) when the external capacitor is not discharged, due to the high gate / source voltage V GS , gate oxide reliability issues in the transistors that control the output voltage; and (b) when the input supply ramps up again, there will be uncontrolled output or spikes in the output voltage that can cause problems downstream. Contents of the invention [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L5/00H01L29/68
CPCH03K17/08104H02M3/07
Inventor S·贝克J·克拉伦贝克
Owner TEXAS INSTR INC