Infineon BTS443PAUMA1 High-Current Power Switch: Datasheet, Pinout, and Application Circuit Guide
The Infineon BTS443PAUMA1 is a robust high-current power switch belonging to the company's esteemed PROFET™ (Protected MOSFET) family of devices. Engineered for demanding automotive and industrial applications, this smart switch integrates a vertical power MOSFET with comprehensive protection and diagnostic features into a single, compact package. This guide provides a detailed overview of its datasheet, pinout, and a typical application circuit.
Datasheet Overview and Key Features
The BTS443PAUMA1 is designed to handle significant power loads with utmost reliability. Its core electrical characteristics define its capabilities:
Output Current: It can continuously deliver up to 17 A of load current, making it suitable for driving high-power components like motors, heaters, or lamps.
Low On-State Resistance (RDS(on)): With a typical RDS(on) of just 7.5 mΩ, the device minimizes power loss and heat generation during operation, significantly improving system efficiency.
Operating Voltage: It supports a wide supply voltage range from 5.5 V to 40 V, covering standard automotive battery conditions, including load-dump scenarios.
Protection Features: A key strength of this IC is its integrated suite of protections. This includes overload and short-circuit protection, over-temperature shutdown, over-voltage protection (including inductive load clamping), and reverse battery protection (with an external series diode).
Diagnostic Feedback: The device provides a diagnostic feedback pin (IS) that offers proportional load current information and signals fault conditions (e.g., open-load, short-to-ground, overtemperature) to the microcontroller.
Pinout Configuration
The BTS443PAUMA1 is housed in a TO-252-4 (DPAK-4) package, which offers a good thermal performance in a small footprint. The pinout is as follows:
1. IN (Pin 1): Input Pin. This is the control input. Applying a logic-high voltage (typically 3.3V or 5V) to this pin enables the power switch.
2. GND (Pin 2): Ground Pin. This pin must be connected to the system ground.
3. IS (Pin 3): Diagnostic Current Sense Pin. This output provides a current proportional to the load current (kIS ≈ 1400) and is pulled low in case of a fault.
4. OUT (Pin 4): Output Pin. This pin connects to the load and is switched by the internal power MOSFET.
Application Circuit Guide
A typical application circuit for the BTS443PAUMA1 is straightforward, thanks to its high level of integration. The basic connections are:
1. Power Path: The battery voltage (VBAT, 12V) is connected directly to the OUT pin. The load is connected between the OUT pin and ground.
2. Control Input: The IN pin is driven directly by a microcontroller GPIO pin. A series resistor (e.g., 1kΩ) can be added for additional EMC robustness.
3. Diagnostics: The IS pin is connected to a microcontroller analog-to-digital converter (ADC) channel to monitor the load current. A pull-up resistor (e.g., 10kΩ) to a voltage source (e.g., 5V) is required for proper fault signaling.
4. Protection: For reverse battery protection, a diode must be placed in series with the supply line to the OUT pin. The integrated clamp circuit protects against overvoltage from inductive load turn-off.
The Infineon BTS443PAUMA1 stands out as an exceptionally efficient and protected high-side switch. Its extremely low RDS(on) ensures minimal power dissipation, while its comprehensive built-in safeguards make system design highly reliable and robust, particularly in the harsh environment of automotive electronics. Its diagnostic capabilities provide critical feedback for system health monitoring, fulfilling the requirements of modern smart power applications.
Keywords:
1. High-Current Switch
2. Protected MOSFET (PROFET)
3. Low RDS(on)
4. Diagnostic Feedback
5. Automotive Grade
