Allegro MicroSystems Inc. Triple Output Step Down Switching Regulator A4491EESTR-T

The A4491 simplifies power supply design with three integrated buck converters, independent enable controls for flexible power sequencing, and a power-on reset with adjustable delay.

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Manufacturer: Allegro MicroSystems, LLC
Win Source Part Number: 139816-A4491EESTR-T
Packaging: Reel - TR
Mounting: SMD (SMT)
Output Type: Adjustable
Topology: Buck
Frequency - Switching: 550kHz
Number of Outputs: 3
Synchronous Rectifier: No
Family Name: A4491
Categories: Integrated Circuits
Status: Active
Temperature Range - Operating: -40°C to 85°C (TA)
Case / Package: 20-QFN (4x4)
Purpose: Step-Down
Maximum Input Voltage: 23V
Nominal Output Voltage (Min/Fixed): 0.8V
Maximum Output Voltage: 20.7V
Minimum Input Voltage: 4.5V
Alternative Parts (Cross-Reference): ADP2303ARDZ-R7; ADP2303ARDZ; TS2509CS RL; TS2515CS RL;
Introduction Date: April 25, 2011
ECCN: EAR99
Country of Origin: Thailand
Estimated EOL Date: 2026
Is this a common-used part?: Yes
Popularity: High
Fake Threat In the Open Market: 40 pct.
Supply and Demand Status: Balance
Quantity per package: 1,500

Buck Switching Regulator IC Positive Adjustable 0.8V 3 Output 20-WFQFN Exposed Pad

Buck Switching Regulator IC Positive Adjustable 0.8V 3 Output 20-WFQFN Exposed Pad

Buck Switching Regulator IC Positive Adjustable 0.8V 3 Output 20-WFQFN Exposed Pad

Switching Regulator, Current-mode, 1.5A, 630kHz Switching Freq-Max, 4 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, MO-220WGGD, QFN-20 Product overview: A4491EESTR-T from Allegro MicroSystems is a Voltage Regulator IC for stable power rails, DC-DC conversion, battery-powered electronics, automotive modules, and embedded power management. It is useful for engineers and buyers comparing datasheets, replacement parts, BOM lines, package options, lifecycle status, and procurement availability. Key searchable attributes include 1.5A, 630kHz, QFN. Search-friendly keywords include voltage regulator, LDO, buck converter, boost converter, power rail, 1.5A, 630kHz, QFN, Voltage Regulator IC, DC Switching Voltage Regulators. This listing supports clearer product discovery for industrial, commercial, repair, automation, power, sensing, and embedded system projects. Product number 739-A4491EESTR-T can be used for catalog matching and distributor lookup.