A81805KESJSR-1

Overview

The A81805KESJSR-1 is a synchronous buck DC-DC regulator manufactured by Allegro MicroSystems. It operates with an input voltage range of 3.5 V to 36 V and provides a fixed 5 V output at up to 2.5 A. The device features a switchable frequency between 400 kHz and 2.5 MHz, low quiescent current of 6 uA, and supports operation from -40°C to +150°C. Packaged in a QFN-20, it includes shutdown functionality and meets automotive reliability standards.

Feature Summary

• Synchronous buck topology for high efficiency
• Wide input voltage compatibility
• Adjustable switching frequency
• Automotive-grade thermal performance

Applications

• Automotive infotainment systems
• ADAS sensor power supplies
• Vehicle body electronics
• Industrial control modules

Procurement Notes

Verify the specific suffix '-1' against the official datasheet to confirm pinout and electrical characteristics match your design requirements. Ensure compliance with RoHS directives and check moisture sensitivity levels before assembly. Confirm availability status as production lifecycles may change.

Selection Notes

Select this component when a fixed 5V output is required from a wide input range. The adjustable frequency allows optimization for EMI or transient response. Verify that the 2.5A continuous current rating meets load demands within the specified temperature range.

Part Context

Part of the A81805 series, designed for automotive applications requiring robust power management. It integrates high-side and low-side MOSFETs into a compact QFN package, reducing external component count compared to discrete solutions.

Replacement Considerations

Check for A81805 variants with different output voltages or packages. Verify if alternative Allegro regulators offer similar current ratings but different input ranges or frequencies.