Low EMI DC/DC buck regulators portfolio expanded

24th July 2018
Lanna Cooper


Allegro MicroSystems has announced the A8660, ARG81880, and ARG81801, the latest additions to their Regulators Portfolio. These devices reduce EMI through switching frequency dithering and allow system noise management though external clock synchronisation.

These devices 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 2.2MHz for reduction in component size and cost.

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

The A8660 synchronous buck controller can drive loads of up to 10A and addresses the constantly growing need for higher power in automobiles and industrial equipment.

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 4×4 QFN-20 wettable flank package with exposed power pad (suffix ES). 

The ARG81880 saves board space and system cost as it requires only three external components. Selectable current limit minimises inductor and capacitor size. Its 20ns controllable on-time facilitates 18-2.5V conversion at 2MHz without pulse skipping. It provides up to 800mA of output current and is offered in a low profile 10-pin 3×3 QFN exposed pad wettable flank package. 

The ARG81801 provides good thermal performance for up to 3A designs, even on PCBs with no vias under the thermal pad, and is offered in a 4×4 QFN-24 exposed pad wettable flank package.

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