Infineon BSP752T: High-Side Power Switch with Diagnostic and Protection Features

The Infineon BSP752T is a highly integrated, intelligent high-side power switch designed to drive resistive or inductive loads in a wide range of automotive and industrial applications. As part of the PROFET™ (Protected MOSFET) family, this device combines a powerful output stage with sophisticated diagnostic and protection circuitry, providing a robust and reliable solution for controlling loads such as solenoids, valves, motors, and lamps.

Constructed using Infineon’s proprietary SMART7 technology, the BSP752T integrates a vertical N-channel power MOSFET with a maximum on-state resistance (RDS(on)) of just 50 mΩ. This low resistance is crucial for minimizing conduction losses and improving overall system efficiency, which is particularly important in power-sensitive and thermally constrained environments like automotive body control modules.

A key strength of this device lies in its comprehensive suite of diagnostic and protection features. It offers precise load current feedback via an analog proportional current sense pin, enabling microcontroller-based monitoring for functions like overload detection, load status verification, and early failure diagnosis. The integrated protections are extensive, including:

Overload and short-circuit protection

Over-temperature shutdown with automatic restart

Over-voltage protection (including load-dump resilience)

Reverse battery protection (up to -40V)

Ground loss and supply voltage transient protection

The BSP752T also features a multifunctional status/diagnostic pin that provides information on overtemperature and open-load conditions, both in on and off states. This level of diagnostic capability simplifies system design, enhances safety, and is critical for meeting stringent automotive functional safety standards such as ISO 26262.

Housed in a compact PG-TO252-5 (DPAK) package, the device is optimized for space-constrained PCB designs. Its automotive-grade qualification (AEC-Q100) ensures high reliability and performance under the harsh operating conditions typical in automotive applications, from powertrain systems to comfort and convenience modules.

ICGOODFIND: The Infineon BSP752T stands out as an exemplary intelligent high-side switch, masterfully blending high power handling with advanced diagnostic intelligence and robust protection. Its extremely low RDS(on), comprehensive feature set, and automotive ruggedness make it an superior choice for designers seeking to enhance the reliability, efficiency, and diagnostic capabilities of their electronic power systems.

Keywords: High-Side Switch, Diagnostic Features, Protection Features, Automotive Grade, Low RDS(on)