Smart Motorbridges + Driver ICs# Technical Documentation: BTS7810K High-Side Power Switch
Manufacturer : Infineon Technologies AG
Document Revision : 1.0
Date : October 2023
---
## 1. Application Scenarios
The BTS7810K is a fully integrated, protected high-side power switch based on Infineon’s proprietary Smart High-Side Power (PROFET™) technology. It is designed for robust, efficient switching of high-current loads in harsh electrical environments, particularly in automotive and industrial systems.
### 1.1 Typical Use Cases
* Solenoid and Valve Control: Directly drives fuel injectors, transmission solenoids, HVAC valves, and hydraulic/pneumatic actuators. Its fast switching and high inrush current capability make it ideal for inductive loads.
* Motor and Heater Control: Used for driving small DC motors (e.g., fans, pumps, window lifters) and resistive heating elements (e.g., seat heaters, mirror defrosters). The integrated protection features are critical for these fault-prone loads.
* Lighting Loads: Controls halogen or LED lighting modules, especially where PWM dimming is required. The device handles the high inrush currents of cold filaments effectively.
* Power Distribution: Serves as a smart electronic fuse or relay replacement in centralized power distribution boxes (PDBs) or zone control modules, enabling intelligent load management and diagnostics.
### 1.2 Industry Applications
* Automotive (Primary Market):
* Body Control Modules (BCM): Powers windows, mirrors, seats, locks, and interior lighting.
* Powertrain: Controls engine management actuators like purge valves, EGR valves, and turbo actuators.
* Thermal Management: Drives radiator fans, coolant pumps, and PTC heaters.
* Comfort & Infotainment: Powers seat adjustment, sunroof motors, and amplifier modules.
* Industrial Automation:
* PLC Output Stages: Replaces mechanical relays for controlling actuators, solenoids, and indicators.
* Factory Robotics: Provides protected power switching for end-effector tools and sensors.
* HVAC Systems: Controls damper actuators, fan coils, and compressor valves.
### 1.3 Practical Advantages and Limitations
Advantages:
* High Integration: Combines a power MOSFET, driver, protection circuits, and diagnostic feedback in a single package (TO-263-7), reducing board space and component count.
* Comprehensive Protection: Features include:
* Overload & Short-Circuit Protection: With adjustable current limitation and automatic restart or latch-off.
* Overvoltage Clamp (e.g., Load Dump): Protects the switch and load from voltage transients.
* Overtemperature Shutdown: With hysteresis to prevent thermal runaway.
* Undervoltage Lockout (UVLO): Ensures proper operation during cranking or shutdown.
* Advanced Diagnostics: The multifunction status pin (IS) provides real-time feedback on output current (proportional), overtemperature, and open-load detection (in off-state), enabling predictive maintenance.
* Low Standby Current: Essential for automotive applications with strict quiescent current requirements.
Limitations:
* High-Side Only: Can only switch the positive supply rail. Low-side switching requires a different device topology.
* Power Dissipation: While protected, sustained high-current operation or frequent switching in high-ambient temperatures requires careful thermal management.
* Cost: Higher unit cost compared to a discrete MOSFET+driver solution, which may not be justified for simple, non-critical applications.
---
## 2. Design Considerations
### 2.1
