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Product Detailed Parameters
- Description：IC REG BUCK 3.3V 2.5A 20QFN
- Series：-
- Mfr：Allegro MicroSystems
- Package：Tape & Reel (TR),Cut Tape (CT)
- Function：Step-Down
- Output Configuration：Positive
- Topology：Buck
- Output Type：Fixed
- Number of Outputs：1
- Voltage - Input (Min)：3.5V
- Voltage - Input (Max)：36V
- Voltage - Output (Min/Fixed)：3.3V
- Voltage - Output (Max)：-
- Current - Output：2.5A
- Frequency - Switching：400kHz ~ 2.5MHz
- Synchronous Rectifier：Yes
- Operating Temperature：-40°C ~ 150°C (TJ)
- Mounting Type：Surface Mount, Wettable Flank
- Package / Case：20-VFQFN Exposed Pad
- Supplier Device Package：20-QFN (4x4)
- Grade：-
- Qualification：-
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Overview
The A81805KESJSR is a synchronous buck DC-DC regulator manufactured by Allegro MicroSystems. It operates with an input voltage range of 3.5 V to 36 V and provides a fixed 5 V output at up to 2.5 A. The device features a switchable frequency between 400 kHz and 2.5 MHz, low quiescent current of 6 uA, and supports operation from -40°C to +150°C. Packaged in a 20-QFN (4x4 mm) with exposed pad for surface mount installation.
Feature Summary
- Synchronous rectification topology for high efficiency
- Wide input voltage compatibility for automotive systems
- Adjustable switching frequency for optimization
- Integrated thermal protection mechanisms
Applications
- Automotive infotainment power distribution
- ADAS sensor power supply regulation
- Body control module voltage conversion
- Telematics unit power management
Procurement Notes
Verify the specific suffix 'JSR' against the official datasheet to confirm package type and tape/reel specifications. Confirm RoHS compliance status and moisture sensitivity level requirements prior to ordering. Ensure the fixed 5V output variant matches the design requirement, as other voltage options may exist within the same series.
Selection Notes
Select this component when a fixed 5V output is required from a wide 36V input range. The 2.5A continuous current capability suits moderate load applications. Consider the 20-QFN package constraints for PCB layout. Verify that the adjustable frequency range aligns with EMI filtering capabilities and inductor selection constraints.
Part Context
This part belongs to the A81805 family of synchronous buck regulators designed for automotive environments. It shares architectural similarities with other members like A81800 but differs in output voltage configuration and current rating. The family targets robust power delivery in harsh electromagnetic and thermal conditions typical of vehicle electronics.
Replacement Considerations
Check for A81805 variants with different output voltages if system requirements change. Verify pin-to-pin compatibility with legacy regulators before substitution. Consult Allegro MicroSystems for updated lifecycle notices regarding end-of-life status.
