BTS113ANKSA1

Product Overview

The Infineon Technologies BTS113ANKSA1 is an advanced high-side power switch designed for automotive and industrial applications requiring robust load switching, protection, and diagnostics. This device integrates a smart power switch with an N-channel MOSFET, providing efficient and reliable control of resistive and inductive loads such as lamps, solenoids, and motors. It offers comprehensive protection features and diagnostic capabilities to ensure safe operation in harsh environments, especially in automotive electronic control units (ECUs).

The BTS113ANKSA1 is designed for ease of use, featuring an intelligent interface for microcontroller control and status feedback, and is optimized for low on-resistance to reduce power loss and improve thermal performance.

Key Features

* Integrated high-side power switch with N-channel MOSFET
* Operating voltage range suitable for 12 V and 24 V automotive systems (up to 40 V max)
* Load current capability up to 6 A continuous
* Low on-resistance for efficient power dissipation
* Overcurrent and short-circuit protection with programmable thresholds
* Overtemperature shutdown with automatic reset
* Load diagnostics including open load, short to ground, and short to battery detection
* Status feedback pin for real-time monitoring of switch conditions
* Undervoltage lockout to prevent operation under insufficient supply voltage
* Integrated slew-rate control to minimize electromagnetic interference (EMI)
* Reverse polarity and load dump protection
* Robust ESD protection and latch-up immunity
* Operating temperature range suitable for automotive grade: –40 °C to +150 °C
* Package: SO-8 with enhanced thermal design

Electrical Specifications

* Supply Voltage (V_BAT): 5.5 V to 40 V (max)
* Load Current (I_LOAD): 6 A continuous
* On-Resistance (R_DS(on)): Typical 17 mΩ at 25 °C
* Overcurrent Detection Threshold: Typically 9.6 A (programmable via device options)
* Standby Current: <10 µA
* Load Dump Protection: Up to 40 V transient
* Switching Frequency: DC or PWM operation up to 25 kHz
* Undervoltage Lockout (UVLO): 5.0 V (typical turn-on threshold)
* Thermal Shutdown Temperature: Approximately 150 °C
* Input Logic Levels: Compatible with 5 V and 3.3 V microcontroller logic
* ESD Immunity: HBM > 8 kV, CDM > 1.5 kV
* Package: SO-8 (8-pin surface-mount)

Functional Description

The BTS113ANKSA1 functions as a high-side switch capable of driving a variety of loads with current up to 6 A. The device integrates a logic-level input transistor to control the MOSFET gate, allowing microcontrollers to switch loads on or off efficiently. The integrated diagnostics provide real-time feedback on load status, including detection of open loads (disconnected or broken load), short to ground (load stuck at ground potential), and short to battery (load stuck at supply voltage).

The overcurrent protection mechanism monitors the load current and switches off the device if the current exceeds the programmed threshold, preventing damage to the switch and the load. In the event of an overtemperature condition, the device automatically shuts down and restarts once the temperature falls to a safe level, ensuring device longevity and system reliability.

The device features an undervoltage lockout that inhibits switch operation at insufficient supply voltages, avoiding unintended load activation. Slew-rate control limits the switching transients to reduce EMI emissions, making the device suitable for noise-sensitive automotive environments.

Typical Applications

* Automotive body control modules (BCM)
* Lamp and lighting control (headlamps, tail lamps, interior lighting)
* Motor and solenoid drivers
* HVAC control systems in vehicles
* Industrial automation and machinery control
* Battery management and power distribution systems
* DC/DC converter outputs and load switches

Design Considerations

* Thermal Management: Ensure adequate PCB copper area and thermal vias are employed to dissipate heat generated by conduction losses, especially under continuous high-current operation.
* Input Signal Levels: Compatible with 3.3 V and 5 V logic inputs, verify microcontroller output compatibility for robust switching.
* Load Characteristics: The device supports resistive and inductive loads; however, inductive loads require appropriate flyback protection and system-level design to manage voltage spikes.
* EMI Optimization: Use the integrated slew-rate control, but additional filtering and careful PCB layout may be necessary in high-frequency switching environments.
* Protection Features: Leverage the diagnostic feedback to monitor system health and implement fault-handling routines in firmware.
* Supply Voltage Conditions: Observe supply voltage range limits and implement proper power sequencing to avoid device malfunction.
* Packaging: The SO-8 package offers compact surface-mount footprint suitable for automated assembly, but ensure proper thermal pad usage if applicable.

Summary

The Infineon BTS113ANKSA1 is a robust and intelligent high-side power switch designed to handle automotive and industrial loads efficiently and safely. With integrated protection mechanisms such as overcurrent detection, thermal shutdown, and comprehensive diagnostic feedback, it ensures reliable system operation under challenging conditions. Its low on-resistance and slew-rate control contribute to efficient power management and reduced electromagnetic interference. Suitable for a wide array of applications, this device simplifies the design of power distribution and load control circuits while meeting stringent automotive industry requirements.