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External sync of buck regulators reduces EMI

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By Nick Flaherty

Allegro’s A8660, ARG81880, and ARG81801 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.

The devices cover a wide output current range (from sub 1 A to 10 A), 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 10 A 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 3 external components. Selectable current limit minimises inductor and capacitor size. Its 20 ns controllable on-time facilitates 18 V to 2.5 V conversion at 2 MHz without pulse skipping. It provides up to 800 mA 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 3 A 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.  

For more information, click here A8660ARG81880, and ARG81801 


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