DC/DC Buck Regulators Trim EMI

Expanding its regulator offerings, Allegro MicroSystems announces the A8660, ARG81880, and ARG81801. The latest devices reduce EMI through switching frequency dithering and allow system noise management though external clock synchronization. They are AEC-Q100 Automotive Qualified, designed to operate over a wide input voltage range to withstand automotive stop/start, cold crank, and load dump conditions, and are also capable of switching at 2.2 MHz for reduction in component size and cost.


Comprehensive safety and protection features enable robust designs and simplify component qualification. The devices cover an output current range from sub 1 A to 10 A, provide tightly regulated supply rails across temperatures, and target automotive and industrial applications such as ADAS, HUD, Telematics, Infotainment, Clusters, Camera Recorders, ECUs, Smart Appliances, Industrial Automation/Robotics, and IoT. Reference designs and demo boards are also available.

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The A8660 synchronous buck controller can drive loads up to 10A. It features flexible power monitoring with adjustable rising delay for microcontroller reset and power sequencing. A high voltage, battery-short tolerant enable input, combined with a second logic level input signal simplifies ignition input driven automotive designs.


The A8660 is offered in a 4 x 4 QFN-20 wettable flank package with exposed power pad (suffix ES). It is priced at $1.42 in quantities of 1,000. The ARG81880 is offered in a low-profile 10-pin 3 x 3 QFN exposed pad wettable flank package. It is priced at $0.95 each/1,000. The ARG81801 comes in a 4 x 4 QFN-24 exposed pad wettable flank package. It is priced at $1.39 each/1,000. For more details, download datasheets for the A8660, ARG81880, and ARG81801.

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