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Product Detailed Parameters
- Description：IC REG BUCK ADJ 5A 20QFN
- Series：Silent Switcher®1
- Mfr：Analog Devices Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- Function：Step-Down
- Output Configuration：Positive
- Topology：Buck
- Output Type：Adjustable
- Number of Outputs：1
- Voltage - Input (Min)：2.9V
- Voltage - Input (Max)：42V
- Voltage - Output (Min/Fixed)：0.97V
- Voltage - Output (Max)：41.58V
- 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#TRPBF is a synchronous step-down Silent Switcher regulator from Analog Devices. It operates with an input voltage range of 3.4 V to 42 V and delivers a continuous output current of 5 A, with an 8 A peak capability. The device features an adjustable output voltage starting at 0.97 V. It supports switching frequencies up to 1.95 MHz and maintains a quiescent current of 750 nA in operation, dropping to 20 nA during shutdown. The component is housed in a QFN-18 package and is rated for industrial temperatures between -40°C and +125°C.
Feature Summary
- Integrates Silent Switcher technology to minimize electromagnetic interference radiation without requiring external filters.
- Provides high-efficiency synchronous buck conversion with integrated power switches and control logic.
- Features ultra-low shutdown supply current to extend battery life in energy-constrained applications.
Applications
- Industrial automation controllers
- Distributed power systems
- Telecommunications infrastructure
Procurement Notes
Verify the specific suffix #TRPBF indicates tape-and-reel packaging when ordering. Confirm that the AJ grade meets the required temperature and performance specifications for your design. Ensure compatibility with the QFN-18 footprint during PCB layout. Cross-reference the manufacturer datasheet for latest revision details before finalizing procurement.
Selection Notes
Select this part for designs requiring a 42V input rail and up to 5A continuous load. The 1.95 MHz frequency allows for smaller passive components compared to lower-frequency alternatives. Consider thermal management requirements due to the dense power density in the QFN-18 package. Verify that the application does not exceed the 8A peak current limit during transient conditions.
Part Context
This component belongs to the LT8640 family of Silent Switcher regulators. It shares architectural similarities with other parts in the series but is distinguished by its specific electrical ratings and package configuration. The AJ variant represents a specific grade within the lineup, tailored for robust industrial performance.
Replacement Considerations
LT8640AJUDCM#PBF is the tube-packaged equivalent of this component. LT8640IUDC#TRPBF offers similar functionality but may differ in switching frequency ranges and thermal characteristics. Verify pinout and electrical parameters against the target replacement before substitution.
