STMicroelectronics has developed a driver with eight high-side and low-side channels with diagnostics, protection, and hardware-controlled limp home.
The L9026 six configurable high-side/low-side outputs and two high-side outputs in an HTSSOP and a 5mm x 5mm x 1mm VFQFPN32 outline for space-constrained applications. The driver also includes a limp-home mode in case of controller failure and two extra input pins for failsafe operation.
The limp-home mode is activated by register settings OR-ed with the external failsafe pins, allows two drivers to remain operational after detection of a fault or supply undervoltage.
The device drives multiple relays, solenoids, LEDs, and resistive loads in equipment such as body electronics, climate controls, and fuel-injection systems, the L9026 can handle resistive, capacitive, and inductive loads. The device has an SPI interface with registers for storing the device configuration as well as internal mapping and pulse width modulation.
Diagnostic and protection features on each channel support ISO 26262 system-level qualification up to ASIL-B in safety-related applications. There is protection against open and short circuits, overcurrent, and overtemperature, with real-time diagnostics available at the SPI interface. Additional features increase flexibility and save the system bill of materials, such as the bulb-inrush mode that automatically protects against excessive power-on current. The L9026 guarantees operation during cranking with battery voltage as low as 3V.
The L9026 is in production now, priced from $1.60 in the HTSSOP24 package and $0.90 in the VFQFPN32 version for orders of 1000 pieces.
www.st.com/l9026-8-channel-driver
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