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As well as current-squared time fusing VNF9Q20F, as it will be known “responds within 100µs to turn off the [output] mosfet if excessive current is detected”, said ST. “Performing as an intelligent circuit breaker, [it] enhances board-net voltage stability and prevents PCB traces, connectors and wire harnesses from overheating. [The] power switch also has a capacitive charging mode that allows harmless in-rush currents.”
Capacitive, inductive and resistive loads can be tolerated, and the IC is protected against over-temperature, load-dump, under-voltage and ground-loss.
Typically, the 21.5mΩ switches are rated a 28V and 34.5A.
Control and diagnostic data is passed via an SPI interface, and there are two one-time programmable direct control input pads.
There are 64 programmable current-limit values and a 10bit ADC to measure internal values including output currents.
“By providing diagnostics through the SPI, and with built-in self-test, the VNF9Q20F enables systems to meet specified safety integrity levels in accordance with ISO 26262,” said ST. “An embedded fail-safe mode preserves operational status in the event of a failure or malfunction.”
There is a great deal going on inside this IC, take a look at the data sheet for more (will auto-download from ST website.
Packaging is 6mm x 6mm QFN package, and available from $2.850 for 1000 pieces.
Find the VNF9Q20F automotive high-side driver on this web page
