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

Description
Designed to provide the power supply requirements of printers, office automation, industrial, and portable equipment, the A4491 provides three high current, high performance, switching regulator outputs in a single package, saving space, cost and component count. High frequency switching allows selection of inexpensive inductors and small ceramic output capacitors. The turn-on cycles of the regulators are interleaved to minimize stresses on the input capacitors and to reduce EMI. Independent Enable pins simplify power sequencing and shutdown capabilities, and a power-on-reset (POR) circuit with user configurable delay indicates when enabled regulators are in specification. The POR flag also indicates when the input voltage drops below specification, giving the system controller advance warning while the switchers continue to operate down to the shutdown level. Internal diagnostics provide comprehensive protection against overloads, input undervoltages, and overtemperatures. Output current capability is ~4.5 A total for all 3 outputs, depending on the combinations of Vin and each Vout level. The A4491 is provided in a 20-contact, 4 mm × 4 mm, 0.75 mm nominal overall height QFN, with exposed pad for enhanced thermal dissipation. It is lead (Pb) free, with 100% matte tin leadframe plating.
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Suppliers

Company
Product
Description
Supplier Links
Triple Output Step Down Switching Regulator - A4491EESTR-T - Allegro MicroSystems Inc.
Manchester, NH, United States
Triple Output Step Down Switching Regulator
A4491EESTR-T
Triple Output Step Down Switching Regulator A4491EESTR-T
Designed to provide the power supply requirements of printers, office automation, industrial, and portable equipment, the A4491 provides three high current, high performance, switching regulator outputs in a single package, saving space, cost and component count. High frequency switching allows selection of inexpensive inductors and small ceramic output capacitors. The turn-on cycles of the regulators are interleaved to minimize stresses on the input capacitors and to reduce EMI. Independent Enable pins simplify power sequencing and shutdown capabilities, and a power-on-reset (POR) circuit with user configurable delay indicates when enabled regulators are in specification. The POR flag also indicates when the input voltage drops below specification, giving the system controller advance warning while the switchers continue to operate down to the shutdown level. Internal diagnostics provide comprehensive protection against overloads, input undervoltages, and overtemperatures. Output current capability is ~4.5 A total for all 3 outputs, depending on the combinations of Vin and each Vout level. The A4491 is provided in a 20-contact, 4 mm × 4 mm, 0.75 mm nominal overall height QFN, with exposed pad for enhanced thermal dissipation. It is lead (Pb) free, with 100% matte tin leadframe plating.

Designed to provide the power supply requirements of printers, office automation, industrial, and portable equipment, the A4491 provides three high current, high performance, switching regulator outputs in a single package, saving space, cost and component count.

High frequency switching allows selection of inexpensive inductors and small ceramic output capacitors. The turn-on cycles of the regulators are interleaved to minimize stresses on the input capacitors and to reduce EMI. Independent Enable pins simplify power sequencing and shutdown capabilities, and a power-on-reset (POR) circuit with user configurable delay indicates when enabled regulators are in specification. The POR flag also indicates when the input voltage drops below specification, giving the system controller advance warning while the switchers continue to operate down to the shutdown level.

Internal diagnostics provide comprehensive protection against overloads, input undervoltages, and overtemperatures.

Output current capability is ~4.5 A total for all 3 outputs, depending on the combinations of Vin and each Vout level.

The A4491 is provided in a 20-contact, 4 mm × 4 mm, 0.75 mm nominal overall height QFN, with exposed pad for enhanced thermal dissipation. It is lead (Pb) free, with 100% matte tin leadframe plating.

Supplier's Site Datasheet
Voltage Regulators - DC DC Switching Regulators - 620-A4491EESTR-TDKR-ND - DigiKey
Thief River Falls, MN, United States
Voltage Regulators - DC DC Switching Regulators
620-A4491EESTR-TDKR-ND
Voltage Regulators - DC DC Switching Regulators 620-A4491EESTR-TDKR-ND
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

Supplier's Site Datasheet
Voltage Regulators - DC DC Switching Regulators - 620-A4491EESTR-TTR-ND - DigiKey
Thief River Falls, MN, United States
Voltage Regulators - DC DC Switching Regulators
620-A4491EESTR-TTR-ND
Voltage Regulators - DC DC Switching Regulators 620-A4491EESTR-TTR-ND
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

Supplier's Site Datasheet
Voltage Regulators - DC DC Switching Regulators - 620-A4491EESTR-TCT-ND - DigiKey
Thief River Falls, MN, United States
Voltage Regulators - DC DC Switching Regulators
620-A4491EESTR-TCT-ND
Voltage Regulators - DC DC Switching Regulators 620-A4491EESTR-TCT-ND
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

Supplier's Site Datasheet
Integrated Circuits - A4491EESTR-T - LIXINC Electronics Co., Limited
Hong Kong, China
Integrated Circuits
A4491EESTR-T
Integrated Circuits A4491EESTR-T
TRIPLE OUTPUT STEP DOWN SWITCHIN

TRIPLE OUTPUT STEP DOWN SWITCHIN

Supplier's Site Datasheet
Integrated Circuits (ICs) - Power Management (PMIC) - Voltage Regulators - DC DC Switching Regulators - A4491EESTR-T - Shenzhen Shengyu Electronics Technology Limited
Futian, China
Integrated Circuits (ICs) - Power Management (PMIC) - Voltage Regulators - DC DC Switching Regulators
A4491EESTR-T
Integrated Circuits (ICs) - Power Management (PMIC) - Voltage Regulators - DC DC Switching Regulators A4491EESTR-T
IC REG BUCK ADJ TRPL 20QFN

IC REG BUCK ADJ TRPL 20QFN

Supplier's Site
PMIC - Voltage Regulators - DC DC Switching Regulators - A4491EESTR-T - Lingto Electronic Limited
Shenzhen, China
PMIC - Voltage Regulators - DC DC Switching Regulators
A4491EESTR-T
PMIC - Voltage Regulators - DC DC Switching Regulators A4491EESTR-T
IC REG BUCK ADJ TRPL 20QFN

IC REG BUCK ADJ TRPL 20QFN

Supplier's Site Datasheet
Voltage Regulators - DC DC Switching Regulators - A4491EESTR-T - Quarktwin Technology Ltd.
Shenzhen, Guangdong, China
Voltage Regulators - DC DC Switching Regulators
A4491EESTR-T
Voltage Regulators - DC DC Switching Regulators A4491EESTR-T
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

Supplier's Site Datasheet
PMIC - PMIC - Voltage Regulators - DCDC Switching Regulators - A4491EESTR-T - 139816-A4491EESTR-T - Win Source Electronics
Yishun, Singapore
PMIC - PMIC - Voltage Regulators - DCDC Switching Regulators - A4491EESTR-T
139816-A4491EESTR-T
PMIC - PMIC - Voltage Regulators - DCDC Switching Regulators - A4491EESTR-T 139816-A4491EESTR-T
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

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

Supplier's Site Datasheet

Technical Specifications

  Allegro MicroSystems Inc. DigiKey LIXINC Electronics Co., Limited Shenzhen Shengyu Electronics Technology Limited Lingto Electronic Limited Quarktwin Technology Ltd. Win Source Electronics
Product Category IC Switching Voltage Regulators IC Switching Voltage Regulators IC Switching Voltage Regulators IC Switching Voltage Regulators IC Switching Voltage Regulators IC Switching Voltage Regulators IC Switching Voltage Regulators
Product Number A4491EESTR-T 620-A4491EESTR-TDKR-ND A4491EESTR-T A4491EESTR-T A4491EESTR-T A4491EESTR-T 139816-A4491EESTR-T
Product Name Triple Output Step Down Switching Regulator Voltage Regulators - DC DC Switching Regulators Integrated Circuits Integrated Circuits (ICs) - Power Management (PMIC) - Voltage Regulators - DC DC Switching Regulators PMIC - Voltage Regulators - DC DC Switching Regulators Voltage Regulators - DC DC Switching Regulators PMIC - PMIC - Voltage Regulators - DCDC Switching Regulators - A4491EESTR-T
Package Type Other; 20-Pin QFN Other; 20-WFQFN Exposed Pad Other; Bulk Other; 20-WFQFN Exposed Pad Other; 20-QFN (4x4)
Configuration / Function Buck Buck; Buck Buck; Buck
Output Voltage Type Adjustable / Variable Adjustable / Variable; Adjustable Adjustable / Variable; Adjustable Adjustable / Variable; Adjustable
Special Features Multiple Outputs Multiple Outputs Multiple Outputs; Synchronous Rectification
Output Voltage 0.8000 to 20.7 volts 0.8000 volts 0.8000 volts 0.8000 to 20.7 volts 0.8000 volts
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