Configurable Driver Enhances Safety with Additional Limp Home Mode Pins

STMicroelectronics has introduced a new driver featuring eight high-side and low-side channels equipped with diagnostics, protection, and hardware-controlled limp-home functionality. The L9026 driver offers six configurable high-side/low-side outputs along with two high-side outputs in an HTSSOP package and a compact 5mm x 5mm x 1mm VFQFPN32 outline, making it ideal for space-constrained applications. In addition to its compact size, the driver includes a limp-home mode designed to ensure continued operation in the event of controller failure, as well as two extra input pins for failsafe operation.

The limp-home mode, which can be activated through register settings OR-ed with external failsafe pins, enables two drivers to remain functional following the detection of a fault or supply undervoltage. This feature enhances the reliability and robustness of the system, making it suitable for critical applications where uninterrupted operation is essential.

Designed to drive a variety of components including relays, solenoids, LEDs, and resistive loads commonly found in body electronics, climate controls, and fuel-injection systems, the L9026 driver offers versatility and compatibility with different load types. Its ability to handle resistive, capacitive, and inductive loads makes it a versatile solution for a wide range of automotive and industrial applications.

Equipped with an SPI interface featuring registers for storing device configuration, internal mapping, and pulse width modulation, the L9026 driver offers advanced control and monitoring capabilities. Each channel of the driver is equipped with diagnostic and protection features that support ISO 26262 system-level qualification up to ASIL-B in safety-critical applications.

With protection mechanisms against open and short circuits, overcurrent, and overtemperature, the L9026 driver ensures reliable and safe operation under various conditions. Real-time diagnostics accessible through the SPI interface provide valuable insights into the status of the system, enabling proactive maintenance and troubleshooting. The device also includes features like bulb-inrush mode to protect against excessive power-on current, enhancing system reliability and longevity.

The L9026 driver is currently in production and available at a competitive price point, starting from $1.60 in the HTSSOP24 package and $0.90 in the VFQFPN32 version for orders of 1000 pieces. Its combination of compact size, advanced features, and robust protection mechanisms make it a compelling choice for designers looking to enhance the performance and reliability of their systems.