Low EMI DC/DC Regulator Helps Engineers Meet Ever-Tightening OEM Standards

Low EMI DC/DC Regulator Helps Engineers Meet Ever-Tightening OEM Standards

2019年11月14日

Ultra-Low Iq Supply Current Ideal for “Keep-Alive” Applications

Allegro MicroSystems, a global leader in power and sensing solutions for motion control and energy efficient systems, today announced the launch of theARG81800—a robust, ultra-low Iq, low EMI DC/DC regulator ideal for keep-alive supply applications. The device sets a new standard, introducing features that help engineers easily achieve tightening OEM standards, such as:

• Ultra-low quiescent current mode
• 150°C工作温度 - 用于苛刻的汽车或工业操作条件
• Pin open/short and component faults
• 独特的EMC减少achieved by incorporating Spread Spectrum frequency modulation (dithering) to a non-dithered external SYNC clock as well as providing a dithered clock output to be used for other converters in the system

“This is not just another buck—the ARG81800 is at the forefront of technology,” explains Mark Gaboriault, Marketing Director at Allegro. “The features that we have added solve real-world challenges for our customers.”

Pass the “airport test”

As electrical content in cars continues to increase, so does the continuous draw of keep-alive systems on the battery. Components must be able to pass the “airport test”—drawing as little current as possible so that the battery can still start the car after an extended period (such as a vacation).Similarly, battery operated industrial systems must limit battery drain to extend service period.

The ARG81800 DC/DC regulator draws just 8 μA, from VIN while regulating 3.3V or 5.0Vout at no load. In comparison to the typical ~100uA budgeted for automotive battery-powered subsystems, this low Iq solution frees up significant overhead to be allocated to other current draws that may occur in the system, allowing more design margin.

Pass EMC

Passing EMC can be a time-consuming, expensive and frustrating process. With extremely low EMI, the ARG81800 is designed to make it easier to pass—the first time around.

“通过EMC的ONU已经历来一直是我们的客户，”戈拉米拉解释道。“我们拥抱了提供解决方案的机会，使我们的客户更容易满足其EMC要求，包括参考设计和design notes.”

The ARG81800 is capable of wide switching frequency up to 2.4 MHz to avoid critical “keep out” zones (e.g., the AM band), as well asfrequency dithering and slew rate control to minimize switching noise. It also offers unique “dithering-on-sync” CLKOUT, which can be used for other switching converters in the system.

专为鲁棒性而设计

Pin opens and pin shorts happen, but they don’t have to ruin the entire board.Robust IC design in the ARG81800—including pin open/short and component faults—protects against IC and PCB damage during manufacturing and eliminates associated scrap costs. The150°CTj operating capability makes the ARG81800 suitable for harsh underhood and industrial automation applications.A power-good output signal with rising-edge delay makes system power sequencing easier and provides diagnostic coverage.

ARG81800以曝光功率焊盘的低轮廓20引脚可湿性侧面QFN封装供应。Samples and evaluation boards are now available.