Allegro LLC Expands Family of DC/DC Buck Regulators with Low EMI

Voltage regulator IC with rated voltage of 50V/40V has a wide output current range from less than 1A to over 10A

Allegro MicroSystems, LLC (hereafter referred to as Allegro) announced the addition of A8660, ARG81880 and ARG81801 to the regulator family, which reduce electromagnetic interference (EMI) by switching frequency dithering and can be synchronized by an external clock. Implement system noise management. Designed for the AEC-Q100 automotive-grade standard, these devices are designed for a wide range of input operating voltages, withstand conditions such as vehicle stop/start, cold start and load dump, and can be switched at 2.2 MHz, thus reducing components Size and cost. Its comprehensive safety and protection features enable robust design and simplifies component certification. With a wide output current range (from less than 1A to over 10A), these devices provide tightly regulated power rails over temperature, ideal for advanced driver assistance systems (ADAS), heads up display (HUD), telematics Systems (telematics), infotainment systems, clusters (Clusters), cameras, electronic control units, smart appliances, industrial automation/robots, the Internet of Things, and other automotive and industrial applications. Allegro can provide reference designs and demonstration boards for these devices to simplify design and evaluation.

The A8660 synchronous buck controller can deliver up to 10A of current to the load, meeting the growing demand for higher power in automotive and industrial equipment. This product features flexible power monitoring with adjustable rise delay for microcontroller reset and power sequencing. A high voltage, enable input that allows shorting of the battery, combined with a second logic level input signal, simplifies the design of the ignition input driven vehicle. The A8660 is available in a 4 x 4 QFN-20 tin-coated wing package with an exposed power pad (suffix ES).

The ARG81880 requires only three external components, saving board space and system cost. The optional current limit minimizes inductor and capacitor size, and its 20ns controllable turn-on time facilitates 18V to 2.5V conversion at 2MHz without the need for pulse skipping. The ARG81880 is capable of delivering up to 800mA of output current in a thin 10-pin 3×3 QFN exposed pad with a tin-coated side package.

The ARG81801 is designed to provide excellent thermal performance for designs up to 3A, even on PCBs with no vias under the thermal pad. This product is available in a 4 x 4 QFN-24 exposed pad with a tin-coated side package.

Author：Brittany Antonia （The author of article owns the copyright.）