In managing high-current loads in automotive and industrial control systems, traditional mechanical relays and discrete power switches are being replaced by intelligent power devices with protection features and integrated diagnostic capabilities . The BTS50085-1TMA, a highly integrated intelligent high-side switch from Infineon, offers a nominal 44 A (ISO, typical, 38 A minimum) drive capability, excellent fault protection mechanisms, and stable temperature performance, making it an ideal choice for load control in harsh environments.
Product Overview
The BTS50085-1TMA, part of the Infineon PROFET™ product family, is a single, N-channel, high-side power switch that supports a wide operating voltage range of 5.0 V to 58 V. With a typical on-resistance of 7.2 mΩ (9 mΩ maximum) at 25°C and IL = 20 A, it provides stable drive capability while effectively reducing system power consumption. Its PG-TO220-7-4 package offers excellent thermal coupling, making it suitable for medium- to high-current continuous load scenarios.
The device integrates multiple electrical protection mechanisms, including current limiting, short-circuit shutdown, over-temperature protection, overvoltage protection, and open-load detection. These mechanisms support automatic disconnection or self-recovery in the event of an electrical fault, significantly improving overall system stability and safety.
Key Specifications
Parameter items | Specifications |
Operating voltage range | 5.0 V ~ 58 V |
Rated load current | Rated load current: 44 A (typical, 38 A minimum) |
On-resistance (typical) | 7.2 mΩ (25 °C, IL=20 A), 9 mΩ max |
Input control method | Current-controlled input: IIN(on) typical 0.8 mA, maximum 1.5 mA; IIN(off) ≤ 80 µA; IN-GND ≈ Vbb when off |
Internal protection mechanism | Overcurrent/short-circuit protection (typ. 90 A current limit, shutdown within 80–300 µs); overtemperature shutdown (150 °C); overvoltage protection (output clamp typ. 62 V, supply cut-off 68–72 V); reverse polarity protection (–42 V); open-load detection |
Package | PG-TO220-7-4 (abbreviated as TO-220-7) |
Power dissipation capability | 170 W (@ Tc ≤ 25 °C) |
Operating temperature range | –40 °C to +150 °C (junction temperature TJ) |
Application Advantages and Engineering Notes
- High reliability load switching capability
It can stably drive motors, fans, solenoid valves, seat heating and other automotive or industrial heavy loads, and has the ability to replace relays.
- Multiple embedded protection logic
Integrates functions such as current limiting, short-circuit shutdown, thermal protection, overvoltage, and disconnection detection to improve system stability and self-healing capabilities.
- Diagnostics and current sensing feedback
Features a current sensing ratio (typically approximately 13,000:1, varying with conditions) to support load current diagnostics and open-circuit detection.
- Compact design and thermal-friendly package
Low on-resistance reduces power consumption, and combined with metal bottom packaging, it simplifies the heat dissipation structure.
Typical Applications
Applications | Description |
Automotive electronic systems | Drives seat heaters, electromagnetic locks, fans, lights, electric tailgate, etc. |
Industrial automation equipment | Control medium and high power loads such as pumps, valves, electromagnetic relays, heating modules, etc. |
Power distribution module | Replace mechanical relays to achieve intelligent power on/off and load protection functions |
Related Devices (PROFET™ Family)
The BTS50085-1TMA belongs to the Infineon PROFET™ intelligent high-side power switch family, which offers a variety of models with different current levels and package types to adapt to various practical load control requirements. The following is a comparison of key parameters of some typical devices:
model | Load current capability | On-resistance (typical/maximum) | Package | Key Features | Application positioning |
BTS50085-1TMA | 44 A (typical, 38 A minimum) | 7.2 mΩ (typical), 9 mΩ (maximum) | PG-TO220-7-4 | Multiple protections, wire break detection, thermal shutdown | High current loads, relay replacement, heating control |
15 A | 12 mΩ (max) | TO-252-5 | High-side power switch, compact SMD package, AEC-Q100 qualified | Valve drive, solenoid actuator, medium current load for 12 V system | |
9 A (max) | 8 mΩ (typical), 10 mΩ (maximum) | PG-TO220-7-4 / TO-263-7 | Smart high-side switch, supports diagnostic protection, lifecycle has been discontinued (Obsolete) | Medium power control, diagnosis and protection system, suitable for reference when replacing design |
Note: Most models in this series are designed for automotive applications and have AEC-Q100 automotive certification (the specific grade and applicable scope are subject to the data sheet of each model).
System Design Recommendations
- Heat dissipation recommendations: The PG-TO220 package is recommended to be used with a heat sink or PCB heat dissipation copper foil to reduce the risk of junction temperature;
- Input anti-interference design: In long-line driving situations, appropriate series resistors and clamping networks can be configured at the input to improve EMI immunity and protection capabilities;
- Load disconnection monitoring: The device can detect open-circuit load status, facilitating system feedback and safety control;
- Short-circuit and overvoltage protection circuit: Short-circuit current limit is typically 90 A, and it shuts down within 80–300 µs. The output clamp is typically 62 V, and the power supply overvoltage protection is approximately 68–72 V. It is recommended to consider the response characteristics in the design.
- High-voltage safety distance design: Pay attention to the creepage distance between the logic terminal and the power output during use to ensure insulation reliability.
The BTS50085-1TMA is a highly reliable, highly integrated intelligent power device designed specifically for automotive and industrial load switching applications, offering a balanced solution with simplified wiring, stable output, and comprehensive protection. The BTS50085-1TMA series covers a variety of packages and current ratings, allowing engineers to flexibly select the device based on system power requirements and board space, enabling engineers to build safer, more efficient systems with enhanced diagnostic capability.
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