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Product Detailed Parameters
- Description：IC REG BUCK ADJ TRPL 20QFN
- Series：-
- Mfr：Allegro MicroSystems
- Package：Tube
- Function：Step-Down
- Output Configuration：Positive
- Topology：Buck
- Output Type：Adjustable
- Number of Outputs：3
- Voltage - Input (Min)：4.5V
- Voltage - Input (Max)：34V
- Voltage - Output (Min/Fixed)：0.8V
- Voltage - Output (Max)：30.6V
- 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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Overview
The A4490EES-T is a discontinued triple output step-down switching regulator from Allegro MicroSystems. It operates with an input voltage range of 4.5 V to 34 V and provides three adjustable positive outputs, each capable of delivering up to 4.5 A. The device utilizes a fixed 550 kHz switching frequency and features a 20-WFQFN exposed pad package for surface mount installation. Designed for industrial and automotive environments, it functions within a temperature range of -40°C to +85°C.
Feature Summary
- Integrates three independent synchronous buck converters in a single compact package
- Supports wide input voltage ranges suitable for automotive and industrial bus architectures
- Features adjustable output voltages allowing flexible power rail configuration
Applications
- Automotive infotainment systems requiring multiple regulated power rails
- Industrial control units needing isolated or non-isolated multi-voltage distribution
- Embedded computing platforms utilizing high-current logic and memory supplies
Procurement Notes
This component is officially obsolete and no longer manufactured by Allegro MicroSystems. Procurement is limited to existing surplus stock from authorized distributors or secondary market suppliers. Verify lot dates and authenticity carefully when sourcing end-of-life inventory. Ensure compatibility with the recommended replacement part before finalizing any acquisition.
Selection Notes
Select this part only if legacy design compatibility is required. For new designs, consider the active successor A4490EESTR-T which offers identical electrical specifications and pinout compatibility. Evaluate thermal performance requirements as the QFN-20 package relies on board-level heat sinking. Confirm that the 550 kHz switching frequency aligns with electromagnetic interference constraints in the target application.
Part Context
The A4490EES-T belongs to the A4490 series of triple-output DC-DC converters. It was designed to simplify power management in complex electronic systems by consolidating three buck regulators into one IC. The tube packaging variant distinguishes it from the later tape-and-reel EESTR-T version. Its discontinuation reflects standard product lifecycle management practices in the semiconductor industry.
Replacement Considerations
The A4490EESTR-T is the confirmed direct replacement. It maintains functional equivalence and pinout compatibility while transitioning to tape-and-reel packaging.
