Buck regulator supports automotive infotainment applications

24th February 2016

Enaie Azambuja

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Datasheet

The latest A8591 from Allegro MicroSystems Europe is a buck regulator IC designed to meet the power-supply requirements of the latest automotive infotainment systems. It is available in fixed 5V or 3.3V regulated output voltage configurations. The new AEC-Q100 qualified device provides all the control and protection circuitry of a 2A regulator circuit with ±1% output voltage accuracy.

An ultra-low-IQ mode employs PFM to draw less than 33μA from a 12V input while supplying a 5 V/40 μA output, making the A8591 ideal for automotive battery-powered “keep-alive” applications.

A “sleep” feature is included which reduces the standby current down to 5μA. When operational, the A8591 operates down to at least 3.6 V input to accommodate idle-stop battery input requirements. The regulator PWM switching frequency can be set between 300kHz and 2.4MHz and “dithered” or synchronised to an external clock.

The A8591 has extensive protection features including pulse-by-pulse current limit, “hiccup” mode short-circuit protection, open/short-circuit asynchronous diode protection, boot open/short-circuit voltage protection, input-voltage undervoltage lockout, NPOR, and thermal shutdown.

This new regulator is targeted at the automotive and industrial markets, including applications such as infotainment, centre stack and instrument clusters, ADAS, head-up displays, HVAC systems and industrial controls.

The A8591 is supplied in a 3 mm×3 mm 10-pin wettable flank DFN package (suffix EJ) with exposed power pad for enhanced thermal dissipation. It is lead free, with 100% matt-tin leadframe plating.