company blog about Infineon BTS3160D Single Channel Smart Low-Side Power Switch With Protective Functions

Infineon BTS3160D Single Channel Smart Low-Side Power Switch With Protective Functions

Shenzhen Mingjiada Electronics Co., Ltd., a leading distributor in the electronic components industry, now specialises in supplying the Infineon-manufactured BTS3160D single-channel smart low-side power switch. This product, with its outstanding protection features and high integration design, is an ideal choice for applications in automotive electronics, industrial control, and other fields.

BTS3160D Product Overview and Core Features

The BTS3160D is a latchable single-channel low-side power switch housed in a PG-TO-252-5-13 package, featuring embedded protection functions. The power transistor is constructed using an N-channel vertical power MOSFET. The device is controlled by a smart power technology control chip. The BTS3160D device can switch various resistive, inductive, and capacitive loads. For lighting loads, the inrush current of the lamp must be considered, which is 8 to 10 times the rated current. The maximum inrush current must be lower than the minimum short-circuit shutdown current. ESD protection for the VS and IN/Fault pins is ground-related.

The BTS3160D is powered by the VS pin. This pin can be connected to the battery circuit. The power supply voltage is monitored by an under-voltage lockout circuit. Even with a 3.3 V input signal, the gate drive unit enables the device to operate within a low-ohm range. For PWM applications, the BTS3160D device provides smooth turn-on and turn-off through an embedded edge-shaping function to reduce electromagnetic compatibility noise. Overvoltage protection is provided to protect against load dump or inductor turn-off conditions. If the drain-source voltage becomes too high, the power MOSFET will limit it. This feature is available even without power. Over-temperature protection prevents the device from overheating due to overload and poor cooling conditions.

To reduce device stress, edge shaping is disabled during thermal shutdown. After thermal shutdown, the BTS3160D device remains in the off state until the latch is reset by an IN-Low signal. Under high-dynamic overload conditions such as short circuits, if the load current reaches a certain threshold, the BTS3160D device will shut down. Short-circuit shutdown is a latch function. The device remains in the off state until the IN-Low signal resets the latch. To reduce device stress, edge shaping is disabled during short-circuit shutdown.

Key performance parameters of the BTS3160D:

Wide voltage operating range: 6V to 45V supply voltage, suitable for various application scenarios

High output current capability: continuous output current of 7.8A, peak current up to 70A

Ultra-low on-resistance: Typical value as low as 8 milliohms, significantly reducing power loss

Wide temperature operating range: -40°C to 150°C junction temperature range, suitable for harsh environments

Logic level input compatibility: Directly supports 3.3V or 5V microcontroller interfaces, simplifying system design

Core advantages of the BTS3160D:

Thermal shutdown lockout protection: automatically shuts down and maintains a locked state when the chip temperature exceeds the safety threshold, preventing thermal runaway

Fixed current limit protection: prevents overcurrent damage to the device and load

Overvoltage protection (OVP): ensures system safety in abnormal voltage conditions

Undervoltage lockout (UVLO): ensures the system does not malfunction when the power supply voltage is insufficient

Electrostatic Discharge (ESD) Protection: Enhances device reliability during assembly and use

Additionally, the BTS3160D features a digital fault information output function, enabling real-time monitoring of switch status via a microcontroller for smarter system management and fault diagnosis. The BTS3160D's environmentally friendly design complies with RoHS standards and has been certified by the Automotive Electronics Council (AEC), making it particularly suitable for automotive electronics applications.

Internal structural features of the BTS3160D:

Smart control chip: Utilises Infineon's advanced smart power technology, integrating logic control, protection circuits, and drive circuits

Vertical power MOSFET: Low on-resistance design reduces power loss and improves energy efficiency

ESD protection structure: All sensitive nodes are built-in with ESD protection, enhancing reliability during assembly and use

Detailed electrical characteristics of the BTS3160D:

Ultra-low static current: Supply current as low as 1.6mA, suitable for battery-powered applications

Fast switching characteristics: Optimised gate drive design enables fast switching, reducing switching losses

Excellent linearity: Maintains stable switching characteristics across a wide load range

Protection function operating mechanism of the BTS3160D:

Thermal shutdown: Triggered when the junction temperature exceeds approximately 150°C, the device shuts down and enters a locked state, requiring power-off reset

Current limiting protection: Real-time monitoring of MOSFET current, limiting gate voltage when exceeding the threshold to keep current within a safe range

Undervoltage lockout: Monitors power supply voltage, disabling output when Vbb drops below approximately 6V to prevent incomplete conduction of the power MOSFET

Typical Application Scenarios for BTS3160D

1. Automotive Electronic Systems

Body Control Module: BTS3160D is particularly suitable for built-in lighting dimming control, enabling precise management of LED light brightness adjustment

Rear Windscreen Wiper Motor Drive: Provides stable power switching control while incorporating protection features to address challenges posed by motor inductive loads

Electric Window Control: Reliably drives window motors with integrated protection features to prevent damage from stalling

Seat heating system: Safely controls heating element power, with temperature protection functions enhancing system reliability

2. Industrial automation

Small motor drive: The BTS3160D is suitable for compact motor control in equipment such as conveyor belts and automatic doors

Solenoid valve control: Reliably switches inductive loads, with built-in protection to address back EMF

PLC output module: Replaces traditional relays, providing a faster and more reliable switching solution

3. Consumer electronics and home appliances

Smart home devices: such as smart sockets and home appliance power control modules

Power management unit: BTS3160D is used in systems requiring intelligent power distribution