Infineon BTS7040-1EPA High-Side Power Switch: Datasheet, Application Circuit, and Pin Configuration Guide

The Infineon BTS7040-1EPA is a versatile and robust high-side power switch belonging to the company's PROFET™ (Protected MOSFET) +2M family. Designed for precise control of high-current loads in 12V and 24V automotive and industrial systems, this device integrates advanced protection, diagnosis, and control features into a compact package. It is an ideal solution for driving a wide range of resistive and inductive loads, such as lamps, solenoids, and motors.

Pin Configuration Guide

The BTS7040-1EPA is housed in a PG-SSO-14-1 (Exposed Pad) package, which provides excellent thermal performance. The pinout is critical for proper PCB layout and functionality:

IN1, IN2, IN3, IN4 (Pins 1, 2, 13, 14): These are the digital control input pins for each of the four independent channels. A logic high signal (typically > 3.5V) turns the respective channel ON.

OUT1, OUT2, OUT3, OUT4 (Pins 3, 5, 10, 12): These are the switched output pins connected to the load.

SR (Pin 4): The slew rate adjustment pin. Connecting a resistor (`R_SR`) between this pin and ground sets the switch-on slew rate for all channels, minimizing electromagnetic interference (EMI).

DIAG (Pin 6): The open-drain diagnosis output pin. This pin pulls low to indicate a fault condition (e.g., overload, short circuit, or overtemperature) on any enabled channel.

IS (Pin 7): The analog current sense pin. It provides a proportional current mirror output (`k I_LOAD`) for real-time load current monitoring.

GND (Pins 8, 9): The ground reference pins for the IC's logic and control sections.

VS (Pin 11): The supply voltage pin, connected directly to the battery or main power rail (4.5V to 40V).

Exposed Pad (Pin 15): This pad must be soldered to the PCB's ground plane to provide effective thermal dissipation.

Key Datasheet Parameters and Features

Understanding the core electrical characteristics from the datasheet is essential for reliable design:

Output Channels: 4 independent channels.

Operating Voltage Range: 4.5 V to 40 V, making it suitable for load-dump conditions in automotive environments.

Continuous Current per Channel: Up to 0.7 A (higher current can be achieved by parallelizing channels).

Low Standby Current: Typically 7 µA, ideal for always-on battery applications.

Advanced Protection & Diagnosis:

Overload and Short-Circuit Protection: Active current limiting with automatic restart or latch-off mode.

Overtemperature Shutdown: Shuts down the output if the junction temperature exceeds a safe threshold.

Overvoltage Protection (including active clamp): Protects the switch from voltage transients.

Undervoltage Reset: Ensures defined behavior during power-up and power-down.

Open Load Detection in OFF-state.

Logic Level Inputs: Compatible with 3.3V and 5V microcontrollers.

Typical Application Circuit

A standard application circuit for one channel of the BTS7040-1EPA is straightforward, requiring very few external components:

1. The microcontroller GPIO pin is connected directly to the INx pin, often with a series resistor for additional EMC robustness.

2. The load is connected between the OUTx pin and ground.

3. A decoupling capacitor (e.g., 100nF) must be placed as close as possible between the VS and GND pins.

4. A resistor (`R_SR`) is connected between the SR pin and ground to set the desired turn-on speed.

5. The DIAG pin is typically pulled up to a positive supply (e.g., 5V) via a resistor. The microcontroller can read this line to check for faults.

6. The IS pin can be connected to ground via a sense resistor (`R_IS`). The voltage across this resistor (`V_IS = k I_LOAD R_IS`) is measured by an MCU's ADC for current sensing.

ICGOODFIND Summary

The Infineon BTS7040-1EPA is a highly integrated, four-channel high-side switch that excels in harsh electrical environments. Its key strengths lie in its comprehensive suite of embedded protection features, accurate analog current sense capability, and minimal external component count. This combination simplifies design, enhances system reliability, and provides valuable diagnostic feedback, making it a superior choice for modern automotive body electronics and industrial control modules.

Keywords:

High-Side Switch, PROFET, Current Sense, Automotive Grade, Diagnostic Output