Infineon BTS3035EJ Smart High-Side Power Switch: Features and Application Overview

The Infineon BTS3035EJ is a smart high-side power switch belonging to the company’s PROFET™ (PROtected Field Effect Transistor) family of devices. Designed for robust and efficient power control in automotive and industrial applications, this component integrates advanced protection, monitoring, and control features into a single package. It serves as a reliable interface between low-power microcontrollers and high-current loads, making it ideal for a wide range of switching tasks.

Key Features of the BTS3035EJ

One of the standout attributes of the BTS3035EJ is its high level of integration. The device incorporates a vertical power MOSFET with a charge pump for easy gate driving, enabling it to handle continuous currents up to 0.7 A from a standard logic-level signal. Its low on-state resistance (RDS(on)) ensures minimal power dissipation, which enhances energy efficiency and reduces thermal stress.

A major advantage of this smart switch is its comprehensive suite of built-in protection features. These include protection against overload currents and short circuits, which safeguards both the switch and the connected load. The device also features overtemperature protection that shuts down the operation if the junction temperature exceeds a safe threshold, automatically restarting once it cools down. Additionally, it offers overvoltage protection (including load-dump resilience) and reverse battery protection, which is critical for harsh automotive environments.

The BTS3035EJ provides diagnostic feedback via a status output pin. This open-drain output can signal fault conditions—such as overtemperature or short circuit—to the controlling microcontroller, enabling predictive maintenance and system monitoring. It also includes overcurrent limitation (active current limiting) to manage in-rush currents from capacitive loads.

Application Overview

The BTS3035EJ is engineered primarily for 12 V automotive systems but is equally suitable for industrial control systems. Its ability to withstand harsh electrical conditions makes it perfect for driving resistive, inductive, or capacitive loads.

Common applications include:

- Automotive body electronics: Controlling lights, seat heaters, window lifters, and small motors.

- Power distribution systems: Acting as a solid-state relay in fuse boxes or power management units.

- Industrial solenoids and valves: Providing reliable switching for actuators and valves in automation systems.

- DC motor control: Driving small motors in comfort and convenience modules.

The device is housed in a TO-252 (DPAK) package, which offers good thermal performance and facilitates easy PCB mounting. Its small form factor is advantageous in space-constrained applications.

ICGOOODFIND

The Infineon BTS3035EJ stands out as a highly integrated and protected high-side switch, offering designers a compact, efficient, and intelligent solution for managing power in demanding environments. Its combination of diagnostic capabilities, robust protection mechanisms, and ease of use makes it a preferred choice for modern automotive and industrial designs.

Keywords:

Smart High-Side Switch, Overcurrent Protection, Automotive Applications, Diagnostic Feedback, Power Management