Smart High-Side Power Switch Four Chanmels : 4 x 140mΩ Status Feedback # Technical Documentation: BTS716GB High-Side Power Switch
Manufacturer : INFINEON
Component : BTS716GB (Dual-Channel High-Side Power Switch in PG-DSO-20 Package)
Document Version : 1.0
Date : October 2023
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## 1. Application Scenarios
The BTS716GB is a dual-channel, high-side power switch designed for robust automotive and industrial applications. It integrates protective features, diagnostic feedback, and low on-state resistance, making it suitable for controlling resistive, inductive, and capacitive loads.
### Typical Use Cases
- Automotive Load Control : Directly drives loads such as lighting (LEDs, bulbs), heating elements (seat heaters, mirror defoggers), motors (small DC motors, actuators), and solenoids.
- Inductive Load Switching : Manages inductive loads like relays, valves, and small motors with built-in clamp diodes for flyback protection.
- Resistive Load Management : Controls resistive loads including lamps and heating pads with high inrush current handling.
- Multiplexed Power Distribution : Enables centralized power switching in zone control modules, reducing wiring complexity.
### Industry Applications
- Automotive Body Electronics : Power window controls, door lock actuators, interior lighting, and HVAC blower modules.
- Industrial Automation : PLC output modules, solenoid valve drivers, and small motor controllers.
- Consumer Appliances : White goods (e.g., dishwasher valves, washing machine pumps) and power tools.
- Energy Management : Battery disconnect switches and low-voltage power distribution units.
### Practical Advantages
- Integrated Protection : Features overcurrent protection (with adjustable current limitation), overtemperature shutdown, and load current feedback via diagnostic pins (IS1, IS2).
- Low Power Dissipation : Typical on-state resistance (RDS(on)) of 7 mΩ per channel at 25°C minimizes heat generation.
- Diagnostic Capabilities : Provides open-load detection (in off-state), short-to-ground detection, and overtemperature warning via status flag pins (SF1, SF2).
- EMC Robustness : Designed to meet automotive EMC standards, with controlled slew rates to reduce electromagnetic emissions.
### Limitations
- Voltage Range : Operates from 5.5 V to 28 V DC; not suitable for higher voltage systems (e.g., 48 V automotive).
- Current Handling : Maximum continuous current of 16 A per channel (with proper heatsinking); parallel operation for higher currents is not recommended due to potential current imbalance.
- Package Constraints : The PG-DSO-20 package requires adequate PCB cooling for high-current applications; junction-to-ambient thermal resistance (RthJA) is 60 K/W without heatsink.
- Diagnostic Accuracy : Current sense feedback (kILIS) has a tolerance of ±15%; precise current measurement requires calibration.
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## 2. Design Considerations
### Common Design Pitfalls and Solutions
- Thermal Management :
Pitfall : Overheating under high continuous currents, leading to thermal shutdown.
Solution : Use a PCB with at least 2 oz copper thickness, incorporate thermal vias under the exposed pad, and consider an external heatsink for currents above 10 A per channel.
- Inductive Load Switching :
Pitfall : Voltage spikes from inductive turn-off damaging the switch or causing false diagnostics.
Solution : Ensure clamp diodes are connected (internal to BTS716GB for DC loads) and add external TVS diodes for high-inductance loads (e.g., >50 mH).
- Inrush Currents :
Pitfall : Cold incandescent lamps or capacitive loads causing overcurrent trips.
Solution : Use the adjustable current limitation feature (via ILIM pin) to
