ARG81800KESJSR

Overview

The ARG81800KESJSR is a synchronous buck regulator IC from Allegro MicroSystems, designed for automotive applications with AEC-Q100 qualification. It features a wide input voltage range of 3.5V to 36V and delivers a maximum output current of 1A. The device supports adjustable output voltages starting from a minimum of 0.8V, with a fixed maximum limit of 36V. Its switching frequency is programmable between 250kHz and 2.4MHz. The component operates within a junction temperature range of -40°C to 150°C and is housed in a 20-WFQFN package with exposed pad.

Feature Summary

• Ultra-low quiescent current capability enables minimal power consumption during light load or standby conditions.
• Integrated SYNCIN and CLKOUT pins facilitate external clock synchronization and EMI reduction through frequency jittering.
• Includes comprehensive protection mechanisms such as thermal shutdown, overvoltage protection, and hiccup mode short-circuit protection.

Applications

• Automotive electronic control units requiring low standby power
• Wide input voltage DC-DC conversion systems
• Battery-powered devices needing extended operational life

Procurement Notes

Verify the specific suffix 'ES' confirms the 20-pin QFN package with wettable flanks. Confirm AEC-Q100 automotive grade status if required for your application. Check for recent Product Change Notices regarding packaging updates. Ensure compatibility with your system's thermal management requirements given the exposed pad design.

Selection Notes

Select this component when ultra-low IQ is critical for battery longevity. Choose the 1A version for moderate current loads where PCB area optimization is needed. Consider the programmable frequency range to balance efficiency against electromagnetic interference constraints. Verify that the external compensation network meets your stability requirements across the operating temperature range.

Part Context

This part belongs to the ARG818 series of ultra-low IQ synchronous buck regulators. It shares architectural similarities with other members like the ARG81801 but differs in output current capacity. The series targets automotive markets demanding high reliability and efficient power management under varying load conditions.

Replacement Considerations

A8586KEJTR-T is listed as a manufacturer replacement option. Verify functional equivalence and pinout compatibility before substitution.

FAQ

How does the ARG81800 handle low load conditions?

It utilizes an LP mode to maintain output voltage while consuming only microampere-level input current at no load or very light loads.

Can the switching frequency be synchronized externally?

Yes, the SYNCIN pin allows forcing PWM mode and synchronizing with an external clock to reduce EMI/EMC.