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Stepper motors, relays, solenoids, actuators, and other inductive loads can be driven from the low side using an automotive low-side switch, which is a straightforward and cost-effective option. Darlington transistors and NMOS arrays make up our product line. These arrays can have one to eight channels and support voltages up to 50 V.
When a transistor is connected to ground, the load is between +V and the transistor. A low side switch is a transistor that is sitting on the low side of the load or switching the path to ground. These typically make use of an N-Channel MOSFET or a NPN BJT. Motors, solenoids, and heaters are examples of powertrain-related loads for which the low-side driver is frequently utilized.
Fuel pumps and body-related functions like seats, lighting, wipers, and fans are operated by the high-side driver. The primary difference between the two drivers is how they respond to fault conditions.
The MOSFET’s source is directly connected to the ground during low side switching. In the circuit diagram, the load, which is represented by the resistance RL, is situated in between the power supply and the drain. Only the load’s position changes in high side switching.
The Global Automotive low-side switch controller market accounted for $XX Billion in 2023 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2024 to 2030.
Based on VIPower (vertical intelligent power) technology, ST offers a wide variety of smart 3 and 5-pin low-side switches (OMNIFET) designed for use in automobiles. The integration of complete digital and analog control and protection circuits driving a vertical power MOSFET on the same chip is made possible by this exclusive technology.
With their integrated extra features, low-side switches are power switches that can safely handle high currents and withstand the harsh automotive environment. A straightforward TTL logic input (or CMOS logic input for a 5-pin switch) is all they need.
These devices guarantee real-time load control, are protected against overtemperature, and are power-MOSFET pin-to-pin compatible, safeguarding the entire board. Diagnostic functions are also available on our most recent 5-pin devices. Low-side switches are made to operate between -40 and +150°C.
Single and dual drivers with digital status and on-resistance values ranging from 10 m to 300 m are included in ST’s low-side switch and driver product portfolio. These adaptable devices address numerous power applications in automotive body electronics and come in a wide range of packages.
