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Product Detailed Parameters
- Description：IC REG BUCK 3.3V 5A 20QFN
- Series：Silent Switcher®1
- Mfr：Analog Devices Inc.
- Package：Tape & Reel (TR)
- Function：Step-Down
- Output Configuration：Positive
- Topology：Buck
- Output Type：Fixed
- Number of Outputs：1
- Voltage - Input (Min)：2.9V
- Voltage - Input (Max)：42V
- Voltage - Output (Min/Fixed)：3.3V
- Voltage - Output (Max)：-
- Current - Output：5A
- Frequency - Switching：200kHz ~ 3MHz
- Synchronous Rectifier：Yes
- Operating Temperature：-40°C ~ 150°C (TJ)
- Mounting Type：Surface Mount, Wettable Flank
- Package / Case：20-WFQFN Exposed Pad, 18 Leads
- Supplier Device Package：20-QFN (3x4)
- Grade：-
- Qualification：-
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Overview
The LT8640AJUDCM-3.3#TRPBF is a synchronous step-down switching regulator from Analog Devices, designed for high-efficiency power conversion. It features an input voltage range of 3.4 V to 42 V and delivers a fixed 3.3 V output at up to 5 A continuous current, with an 8 A peak capability. The device integrates Silent Switcher technology to minimize electromagnetic interference (EMI) without external filters. Operating frequencies are adjustable between 1.95 MHz and 3 MHz, enabling the use of small passive components. It includes precision internal references, soft-start functionality, and comprehensive protection features such as over-current and thermal shutdown.
Feature Summary
- Integrates Silent Switcher architecture for low EMI radiation
- Fixed 3.3 V output configuration for standard logic levels
- Supports wide input voltage range from 3.4 V to 42 V
- Includes programmable switching frequency and soft-start control
Applications
- Industrial distributed power supply systems
- Point-of-load (POL) regulation in telecom infrastructure
- Automotive electronics requiring AEC-Q100 compliance
- Battery-powered equipment with wide input variations
Procurement Notes
Verify the specific suffix '-3.3' confirms the fixed 3.3 V output variant against the manufacturer's official datasheet. Ensure the package type matches the QFN-18 specification required for your PCB layout. Confirm that the 'TRPBF' designation indicates tape-and-reel packaging suitable for automated assembly processes. Cross-reference the full part number with Analog Devices documentation to ensure compatibility with your system's thermal and electrical requirements.
Selection Notes
Select this component when a fixed 3.3 V rail is required within a 42 V input system. The 5 A continuous and 8 A peak current ratings suit moderate-to-high load applications. Consider the Silent Switcher feature if strict EMI limits apply without adding bulky filters. Evaluate the 1.95 MHz base frequency for optimal trade-offs between efficiency and component size compared to higher-frequency variants.
Part Context
This part belongs to the LT8640A family of Silent Switcher regulators, which emphasizes compact design and low noise. It complements other LT8640 variants by offering a fixed output option, simplifying design cycles for common voltage rails. The family shares core technologies like integrated power switches and advanced control loops, ensuring consistent performance across different output configurations and package options.
Replacement Considerations
LT8640AJUDCM#PBF serves as a tube-packaged alternative with identical electrical characteristics. LT8640IUDCF#TRPBF offers similar performance but may differ in specific thermal or EMI optimization details. Verify pinout compatibility and thermal pad requirements before substitution to ensure seamless integration into existing designs.
