Allegro MicroSystems Inc. Valley Current Mode Control Buck Converter A4403GEUTR-T

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Valley Current Mode Control Buck Converter - A4403GEUTR-T - Allegro MicroSystems Inc.
Manchester, NH, United States
Valley Current Mode Control Buck Converter A4403GEUTR-T
Description The A4403 is a buck converter that uses valley current-mode control. This control scheme allows very short switch on-times to be achieved, making it ideal for applications that require high switching frequencies combined with high input voltages and low output voltages. Low cost is accomplished through high switching frequencies of up to 2 MHz, allowing smaller and lower value inductors and capacitors. In addition, minimal external components are required through high levels of integration. Optimal drive circuits are utilized to minimize switching losses. The switching frequency is maintained constant, as the on-time is modulated by the input voltage. This feed-forward control ensures excellent line correction. The on-time is set by an external resistor pulled-up to the input supply. When power is initially applied and the device is enabled, a user-configurable soft-start function occurs to minimize inrush current and to prevent output overshoot. Internal housekeeping and bootstrap supplies are provided which only require the addition of one small ceramic capacitor. A top-off charge pump is also provide to ensure correct operation at light loads. Internal diagnostics provide comprehensive protection against overcurrents, input undervoltages, and overtemperatures. The device package is a 16-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. Applications Printers, scanners Cable, DSL modems/routers Network and telecom Industrial control Distributed power systems Set top box High power LED supply Battery chargers GPS/Infotainment Top Features Extremely fast load-transient response with minimal output voltage delta Achieves high step-down ratios with on-times <50 ns User-configurable on-time, achieving switching frequencies up to 2 MHz Minimal external components required Optimized for low value filter capacitors and inductors Wide input voltage range: 9 to 46 V Output Current: 3 A Low standby current <100 µA Supplied in thermally-enhanced QFN package EXPAND ×

Description

The A4403 is a buck converter that uses valley current-mode control. This control scheme allows very short switch on-times to be achieved, making it ideal for applications that require high switching frequencies combined with high input voltages and low output voltages.

Low cost is accomplished through high switching frequencies of up to 2 MHz, allowing smaller and lower value inductors and capacitors. In addition, minimal external components are required through high levels of integration. Optimal drive circuits are utilized to minimize switching losses.

The switching frequency is maintained constant, as the on-time is modulated by the input voltage. This feed-forward control ensures excellent line correction. The on-time is set by an external resistor pulled-up to the input supply.

When power is initially applied and the device is enabled, a user-configurable soft-start function occurs to minimize inrush current and to prevent output overshoot. Internal housekeeping and bootstrap supplies are provided which only require the addition of one small ceramic capacitor. A top-off charge pump is also provide to ensure correct operation at light loads.

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

The device package is a 16-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.

Applications

  • Printers, scanners
  • Cable, DSL modems/routers
  • Network and telecom
  • Industrial control
  • Distributed power systems
  • Set top box
  • High power LED supply
  • Battery chargers
  • GPS/Infotainment

Top Features

  • Extremely fast load-transient response with minimal output voltage delta
  • Achieves high step-down ratios with on-times <50 ns
  • User-configurable on-time, achieving switching frequencies up to 2 MHz
  • Minimal external components required
  • Optimized for low value filter capacitors and inductors
  • Wide input voltage range: 9 to 46 V
  • Output Current: 3 A
  • Low standby current <100 µA
  • Supplied in thermally-enhanced QFN package

EXPAND
×

Supplier's Site Datasheet
 - 6807236 - RS Components, Ltd.
Corby, Northants, United Kingdom
A high-voltage buck converter with a competitive rate of efficiency. Able to handle a wide input operating voltage range, this step-down regulator is typically used in consumer equipment power supplies. Maximum Output Current = 3A Regulator Function = Buck Controller Minimum Input Voltage = 9 V Maximum Input Voltage = 46 V Mounting Type = Surface Mount Number of Outputs = 1 Pin Count = 16 Package Type = QFN Switching Regulator = Yes Width = 4mm

A high-voltage buck converter with a competitive rate of efficiency. Able to handle a wide input operating voltage range, this step-down regulator is typically used in consumer equipment power supplies.
Maximum Output Current = 3A
Regulator Function = Buck Controller
Minimum Input Voltage = 9 V
Maximum Input Voltage = 46 V
Mounting Type = Surface Mount
Number of Outputs = 1
Pin Count = 16
Package Type = QFN
Switching Regulator = Yes
Width = 4mm

Supplier's Site
 - 6807236P - RS Components, Ltd.
Corby, Northants, United Kingdom
A high-voltage buck converter with a competitive rate of efficiency. Able to handle a wide input operating voltage range, this step-down regulator is typically used in consumer equipment power supplies. Maximum Output Current = 3A Regulator Function = Buck Controller Minimum Input Voltage = 9 V Maximum Input Voltage = 46 V Mounting Type = Surface Mount Number of Outputs = 1 Pin Count = 16 Package Type = QFN Switching Regulator = Yes Width = 4mm Delivery on production packaging - Reel. This product is non-returnable.

A high-voltage buck converter with a competitive rate of efficiency. Able to handle a wide input operating voltage range, this step-down regulator is typically used in consumer equipment power supplies.
Maximum Output Current = 3A
Regulator Function = Buck Controller
Minimum Input Voltage = 9 V
Maximum Input Voltage = 46 V
Mounting Type = Surface Mount
Number of Outputs = 1
Pin Count = 16
Package Type = QFN
Switching Regulator = Yes
Width = 4mm
Delivery on production packaging - Reel. This product is non-returnable.

Supplier's Site
Voltage Regulators - DC DC Switching Regulators - 620-1273-1-ND - Digi-Key Electronics
Thief River Falls, MN, USA
Voltage Regulators - DC DC Switching Regulators 620-1273-1-ND
IC REG BUCK ADJUSTABLE 3A 16QFN

IC REG BUCK ADJUSTABLE 3A 16QFN

Supplier's Site Datasheet
Voltage Regulators - DC DC Switching Regulators - 620-1273-2-ND - Digi-Key Electronics
Thief River Falls, MN, USA
Voltage Regulators - DC DC Switching Regulators 620-1273-2-ND
IC REG BUCK ADJUSTABLE 3A 16QFN

IC REG BUCK ADJUSTABLE 3A 16QFN

Supplier's Site Datasheet
Voltage Regulators - DC DC Switching Regulators - 620-1273-6-ND - Digi-Key Electronics
Thief River Falls, MN, USA
Voltage Regulators - DC DC Switching Regulators 620-1273-6-ND
IC REG BUCK ADJUSTABLE 3A 16QFN

IC REG BUCK ADJUSTABLE 3A 16QFN

Supplier's Site Datasheet
PMIC - PMIC - Voltage Regulators - DCDC Switching Regulators - A4403GEUTR-T - 1134689-A4403GEUTR-T - Win Source Electronics
Shenzhen, Guangdong, China
PMIC - PMIC - Voltage Regulators - DCDC Switching Regulators - A4403GEUTR-T 1134689-A4403GEUTR-T
Categories: Integrated Circuits (ICs) Manufacturer: Allegro MicroSystems, LLC Packaging: Reel - TR Function: Step-Down Output Configuration: Positive Topology: Buck Output Type: Adjustable Number of Outputs: 1 Input Voltage MIN: 9V Voltage Input MAX: 46V Output Voltage: 0.8V Output Voltage MAX: 46V Output Current: 3A Frequency - Switching: 450kHz ~ 2MHz Synchronous Rectifier: No Operating Temperature Range: -40°C ~ 105°C (TA) Mounting: SMD Package: 16-WQFN Exposed Pad Manufacturer Package: 16-QFN (4x4) Win Source Part Number: 1134689-A4403GEUTR-T Manufacturer Homepage: www.allegromicro.com Storage Condition: Dry storage cabinet & Humidity protection package Popularity: Medium Fake Threat In the Open Market: 51 pct. Supply and Demand Status: Limited Family Name: A4403 Introduction Date: November 05, 2008 Country of Origin: Thailand Halogen Free: Compliant Estimated EOL Date: 2023 Alternative Parts (Cross-Reference): Cross

Categories: Integrated Circuits (ICs)
Manufacturer: Allegro MicroSystems, LLC
Packaging: Reel - TR
Function: Step-Down
Output Configuration: Positive
Topology: Buck
Output Type: Adjustable
Number of Outputs: 1
Input Voltage MIN: 9V
Voltage Input MAX: 46V
Output Voltage: 0.8V
Output Voltage MAX: 46V
Output Current: 3A
Frequency - Switching: 450kHz ~ 2MHz
Synchronous Rectifier: No
Operating Temperature Range: -40°C ~ 105°C (TA)
Mounting: SMD
Package: 16-WQFN Exposed Pad
Manufacturer Package: 16-QFN (4x4)
Win Source Part Number: 1134689-A4403GEUTR-T
Manufacturer Homepage: www.allegromicro.com
Storage Condition: Dry storage cabinet & Humidity protection package
Popularity: Medium
Fake Threat In the Open Market: 51 pct.
Supply and Demand Status: Limited
Family Name: A4403
Introduction Date: November 05, 2008
Country of Origin: Thailand
Halogen Free: Compliant
Estimated EOL Date: 2023
Alternative Parts (Cross-Reference): Cross

Supplier's Site Datasheet

Technical Specifications

  Allegro MicroSystems Inc. RS Components, Ltd. Digi-Key Electronics Win Source Electronics
Product Category IC Voltage Regulators IC Switching Voltage Regulators IC Switching Voltage Regulators IC Switching Voltage Regulators
Product Number A4403GEUTR-T 6807236 620-1273-1-ND 1134689-A4403GEUTR-T
Product Name Valley Current Mode Control Buck Converter Voltage Regulators - DC DC Switching Regulators PMIC - PMIC - Voltage Regulators - DCDC Switching Regulators - A4403GEUTR-T
Package Type Other; 16-lead QFN/MLP Other; QFN Other; 16-WQFN Exposed Pad Other; 16-WQFN Exposed Pad
Operating Temperature -40 to 105 C (-40 to 221 F) -40 to 105 C (-40 to 221 F) -40 to 105 C (-40 to 221 F)
fsw 450 to 2000 kHz 450 to 2000 kHz
Output Voltage Type Adjustable / Variable Adjustable / Variable; Adjustable
VIN 9 to 46 volts 9 to 46 volts 9 volts
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