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Overview for Integrated Load Switches

TI offers a comprehensive portfolio of load switches which enable distribution and power protection ON and OFF the board.


Save power across multiple rails from power up through power down

Avoid damage during short-circuit, hot-swap, overcurrent, and overvoltage events with integrated protection features in eFuses

High-side switches with integrated protection and diagnosis features specialized for automotive and industrial applications


Learn more about what load switches are, why you need them and how to choose the right one.

From consumer electronics to automotive solutions, TI has ideal load switches and reference designs for faster design time.

Get started on your load switch designs by browsing our collection of blog posts, TI E2E™ Community threads, and training videos



Getting to know load switches

What are load switches?

Integrated load switches from the TPS229xx family are integrated electronic relays used to turn on and turn off power rails. Most basic load switches consist of four pins: input voltage, output voltage, enable, and ground. Shown below is a block diagram of a basic load switch.


Hover over a block for additional information

The pass FET is the main component of the load switch, which determines the maximum input voltage and maximum load current the load switch can handle. The on-resistance (RON) of the load switch is a characteristic of the pass FET.
The gate driver charges and discharges the gate of the FET in a controlled manner, thereby controlling the rise time (tR) of the device.
The control logic is driven by an external logic signal. It controls the turn-on and turn-off of the pass FET and other blocks, such as quick output discharge (QOD), the charge pump, and blocks with protection features.
The charge pump is used in load switches with an N-channel FET, since a positive differential voltage between the gate and the source is needed to turn on the FET.
Quick Output Discharge (QOD) is an on-chip resistor from VOUT to GND that is turned on when the device is disabled via the ON pin. This will discharge the output node, preventing the output from floating.
Additional features are included in different load switches. These include, but are not limited to, thermal shutdown, current limiting, and reverse current protection.
Additional features are included in different load switches. These include, but are not limited to, thermal shutdown, current limiting, and reverse current protection.
Additional features are included in different load switches. These include, but are not limited to, thermal shutdown, current limiting, and reverse current protection.

 

Why do you need load switches?

Texas Instruments Load Switches can be used for a variety of applications from power savings to power distribution and power sequencing. Additionally, integration will reduce overall BOM count and solution size, as well as adding additional protection features such as Quick Output Discharge, Reverse Current Protection, and Current Limiting.

Load Switches: What Are They, Why Do You Need Them And How Do You Choose The Right One?

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Integrated load switches are electronic relays that can be used to turn on and turn off power supply rails in systems.

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