A4491EESTR-T

$2.41

Description：IC REG BUCK ADJ TRPL 20QFN
Series：-
Mfr：Allegro MicroSystems
Package：Tape & Reel (TR),Cut Tape (CT)

SKU:267124fae167 Category: Voltage Regulators - DC DC Switching Regulators Brand: Allegro MicroSystems

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Product introduction

Product Detailed Parameters

Description：IC REG BUCK ADJ TRPL 20QFN
Series：-
Mfr：Allegro MicroSystems
Package：Tape & Reel (TR),Cut Tape (CT)
Function：Step-Down
Output Configuration：Positive
Topology：Buck
Output Type：Adjustable
Number of Outputs：3
Voltage - Input (Min)：4.5V
Voltage - Input (Max)：23V
Voltage - Output (Min/Fixed)：0.8V
Voltage - Output (Max)：20.7V
Current - Output：-
Frequency - Switching：550kHz
Synchronous Rectifier：No
Operating Temperature：-40°C ~ 85°C (TA)
Mounting Type：Surface Mount
Package / Case：20-WFQFN Exposed Pad
Supplier Device Package：20-QFN-EP (4x4)
Grade：-
Qualification：-

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A4491EESTR-T

Overview

The A4491EESTR-T is a switching voltage regulator manufactured by Allegro MicroSystems, functioning as the UMC (Universal Manufacturing Company) version of the A4491. It is a buck topology DC-DC converter featuring three adjustable positive outputs. The device operates with an input voltage range from 4.5 V to 34 V and supports a switching frequency of 550 kHz. It utilizes a QFN-20 package for surface mount installation. The component is rated for operation between -40°C and +85°C ambient temperature. Static current consumption is specified at 6 mA. This part is identified as obsolete and subject to discontinuation by the manufacturer.

Feature Summary

Three-output synchronous buck regulator architecture
Wide input voltage capability for automotive applications
Integrated control logic for multi-rail power sequencing

Applications

Automotive infotainment systems requiring multiple regulated rails
Body control modules in vehicle electrical architectures
Industrial power distribution units needing isolated or non-isolated buck conversion

Procurement Notes

Verify end-of-life status before design finalization. Confirm availability of alternative sources or last-time buy options. Check datasheet revisions for manufacturing changes. Ensure supply chain stability for production runs. Validate pin compatibility if substituting with similar family members.

Selection Notes

Consider the A4490 series for comparable performance if A4491 is unavailable. Evaluate thermal requirements for QFN-20 packaging. Assess input voltage stability within the 4.5 V to 34 V range. Verify output current capabilities against load demands. Review EMI filtering needs due to 550 kHz switching frequency.

Part Context

Part of the A449x family of multi-output buck regulators designed for automotive environments. Manufactured by Allegro MicroSystems using UMC processes. Targets applications requiring compact, high-efficiency power solutions with multiple voltage rails.