Wide-Input Automotive Ultralow Iq 2-A Buck Regulator
Allegro MicroSystems, LLC introduces a new buck regulator designed for the 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 33µA from 12-V input while supplying 5V/40µA output, making it suited for automotive battery-powered "keepalive" applications.
The Sleep feature drops 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 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 lead-frame plating and is priced at $1.54 in quantities of 1,000.
