BTS5210LAUMA1

The BTS5210LAUMA1 is a dual-channel intelligent high-side power switch from Infineon Technologies’ Classic PROFET™ 24V product family. This robust device integrates two independent protected high-side switches in a single PG-DSO-12 surface-mount package, designed for demanding 24V automotive and industrial applications.

Each channel features an N-channel vertical power MOSFET with a maximum on-resistance of 140mΩ at 150°C junction temperature, capable of continuously driving up to 2.4A loads. The exceptionally wide operating voltage range from 5.5V to 40V, combined with 55V transient withstand capability, makes this device ideal for both 12V and 24V automotive systems including trucks, buses, and construction equipment where voltage transients are common.

Digital status outputs (ST1 and ST2) provide fault indication for each channel. These open-drain outputs go low during overtemperature, overload, or fault conditions, and can be wire-ORed together to reduce microcontroller I/O count if individual channel diagnostics are not required. The device also supports off-state open-load detection for monitoring bulb integrity or load presence.

Comprehensive protection features include per-channel active current limiting (6.5A typical), thermal shutdown with dynamic restart cycling, output voltage clamping for inductive load demagnetization (47V typical), undervoltage detection, and loss of ground protection. Reverse battery protection can be achieved with a single external ground resistor.

The BTS5210L is manufactured to automotive quality standards and is AEC qualified. With extremely low standby current (less than 1µA), it is well-suited for always-on systems where battery drain during standby must be minimized. Infineon has committed to long-term production availability through at least 2040, making it an excellent choice for programs with long lifecycles.

The BTS5210L operates as two independent smart high-side power switches integrated in a single package. Each channel shares common supply and ground connections but is otherwise independent. Here’s how each channel works:

1. Power MOSFET Stage: Each output channel is built around an N-channel vertical power MOSFET configured as a high-side switch (connecting the load to the positive supply when turned on). A charge pump integrated in each channel generates the voltage above VS needed to drive the N-channel MOSFET gate, requiring no external components.

2. Input Logic (IN1/IN2): Each channel has its own logic input pin. A CMOS-compatible high signal turns the corresponding channel on; a low signal turns it off. The input threshold is compatible with both 3.3V and 5V logic levels. ESD protection diodes are included on all input pins for robustness.

3. Current Limiting: Each channel has an active current limit circuit that monitors the output current and reduces the gate drive if the current exceeds the limit threshold (typically 6.5A, minimum 5A). This prevents supply voltage collapse during short-circuit conditions and limits the power dissipation in the MOSFET during fault events.

4. Thermal Protection: Each channel monitors its own junction temperature. If the temperature exceeds the thermal shutdown threshold (approximately 175°C), the channel is turned off. After cooling below the reset threshold, the channel automatically restarts. For sustained overloads, this creates thermal cycling that maintains a safe average temperature while still providing partial functionality.

5. Status/Diagnostic Output (ST1/ST2): Each channel has an open-drain status pin. During normal operation (channel on, no faults), the status pin is high-impedance (pulled high by external resistor). When an overtemperature or overload fault occurs, the status pin goes low, indicating the fault condition to the system controller.

6. Open Load Detection (OFF-state): When a channel is off, a small current source feeds the output pin. If the load is properly connected, this current flows to ground and the output voltage stays low. If the load is open (disconnected or burned out), the output voltage rises above the detection threshold (3V typical), and the status pin can indicate this condition.

7. Inductive Load Demagnetization: When turning off an inductive load, the output voltage is clamped to approximately 47V (VON(CL)). This allows the energy stored in the inductor to dissipate safely through the power MOSFET, eliminating the need for external freewheeling diodes or snubber circuits.

8. Overvoltage and Undervoltage: Overvoltage protection clamps the output during transient overvoltage conditions. Undervoltage detection monitors the supply voltage and shuts down the channels if VS drops too low, preventing undefined operation at very low supply voltages.

Package: PG-DSO-12 (Plastic Dual Small Outline, 12 leads). Body dimensions: 7.5mm × 6.4mm × 2.35mm (max height). 1.27mm lead pitch. Surface-mount device. Note: All output pins and VS pins with the same name are internally paralleled and must be connected together externally for optimal current and thermal performance.

• Commercial Vehicle Body Electronics: 24V power distribution and load control in trucks, buses, and commercial vehicles for lighting modules, door controls, wiper motors, and heating elements in body control units (BCMs) designed for heavy-duty platforms.
• Industrial 24V Control Systems: Intelligent load switching in PLC output modules, factory automation equipment, industrial sensors, and 24V process control systems, replacing traditional relay-based output cards with solid-state reliability and diagnostics.
• Solenoid and Relay Drivers: Driving solenoid valves, contactors, and relay coils in hydraulic systems, pneumatic controls, and industrial automation, where the fast inductive demagnetization (47V clamp) safely handles turn-off transients without external freewheeling diodes.
• Heavy Equipment and Construction Machinery: Power distribution and auxiliary load control in excavators, bulldozers, cranes, and agricultural equipment, where the wide voltage range and robust protection withstand harsh electrical environments and voltage transients.
• Heating Element Control: Controlling resistive heating elements in seat heaters, mirror defrosters, fuel pre-heaters, and cabin heating systems, with overcurrent and thermal protection ensuring safe operation even under fault conditions.
• DC Motor and Actuator Drivers: Driving small DC motors, linear actuators, and gear motors in automotive and industrial applications, with current limiting and thermal protection providing reliable motor protection against stall conditions.
• Off-Highway and Agricultural Vehicles: Load switching in tractors, harvesters, and other off-highway equipment with 24V electrical systems, where the AEC qualification and wide temperature range ensure reliable operation in extreme environmental conditions.
• Marine and RV Electrical Systems: 24V power distribution in marine vessels, recreational vehicles, and specialty vehicles, where the device’s protection features and solid-state reliability improve system uptime compared to mechanical relays and fuses.