Thursday, July 18, 2024

Highly Integrated Intelligent High-Side Drivers for Automotive Applications

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The new devices combine an efficient 40V trench vertical MOSFET with 3.3V digital logic and high-precision analogue circuitry

Designed for digital current sensing along with the fully digital on-chip diagnostic features, the VN9D30Q100F and VN9D5D20FN from STMicroelectronics are a new generation of automotive intelligent switches that provide high-side connection in applications powered from a 12V battery. The drivers simplify the hardware and software design of electronic control units (ECUs) and enhance system reliability.

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Leveraging the VIPower M0-9 technology, the new devices combine an efficient 40V trench vertical MOSFET with 3.3V digital logic and high-precision analogue circuitry in a 6mm x 6mm QFN package. The compact dimensions and high integration save up to 40% of PCB area compared to other driver ICs.

The VN9D30Q100F has two 33mΩ and four 90mΩ channels. The VN9D5D20FN has two 7.6mΩ and two 20mΩ channels. Each has up to six output channels and a 4-wire SPI interface, which reduces the number of microcontroller I/O pins needed to interact with the device. They also feature an integrated pulse-width modulation (PWM) generator with a resolution of 0.1% for convenient and precise control signal at each output to handle functions such as lamp dimming.

The diagnostic circuitry has a continuously running analogue-to-digital converter (ADC) with 10-bit resolution and 5% precision to provide digital readings of the load current and case temperature, thus eliminating reliance on an ADC in the host microcontroller. The ADC task manager is synchronised with the driver’s PWM engine, ensuring that diagnostics for each output channel is automatically performed in the appropriate time frame without microcontroller intervention. There are also two one-time programmable (OTP) inputs for managing the operation in limp-home mode if a system failure causes a loss of overall host-MCU control.

In addition to cutting hardware costs for customers by minimising power dissipation and PCB-design complexity, these new devices simplify AUTOSAR compliance by providing a complex driver that operates independently from the application, thereby also easing software development.

The VN9D30Q100F and VN9D5D20FN are available now from STMicroelectronics.


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