February 23, 2016
Worcester, MA – Allegro MicroSystems, LLC introduces a new buck regulator designed for power supply requirements of the latest infotainment systems. The device provides all the control and protection circuitry to produce a 2 A regulator with ±1% output voltage accuracy. The A8591 employs pulse-frequency modulation (PFM) to draw less than 33 μA from 12 V input while supplying 5 V/40 μA output, making it ideal for automotive battery-powered “keepalive” applications.
The Sleep feature drops standby current down to 5 μA. 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 300 kHz and 2.4 MHz and dithered, or synchronized to an external clock. It has extensive protection features including pulse-by-pulse current limit, hiccup mode short-circuit protection, open/short asynchronous diode protection, BOOT open/short voltage protection, VIN undervoltage lockout, NPOR, and thermal shutdown.
This new regulator is targeted at the automotive and industrial markets, including applications such as infotainment, center stack and instrument clusters, advanced driver assistance systems (ADAS), and heads-up display (HUD), 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 (Pb) free, with 100% matte-tin leadframe plating.