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Product Detailed Parameters
- Description：IC REG BUCK ADJ 5A 20QFN
- Series：Silent Switcher®1
- Mfr：Analog Devices Inc.
- Package：Tube
- Function：Step-Down
- Output Configuration：Positive
- Topology：Buck
- Output Type：Adjustable
- Number of Outputs：1
- Voltage - Input (Min)：3.4V
- Voltage - Input (Max)：42V
- Voltage - Output (Min/Fixed)：0.97V
- Voltage - Output (Max)：42V
- Current - Output：5A
- Frequency - Switching：210kHz ~ 2MHz
- Synchronous Rectifier：Yes
- Operating Temperature：-40°C ~ 150°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：20-WFQFN, 18 Leads, Exposed Pad
- Supplier Device Package：20-QFN (3x4)
- Grade：-
- Qualification：-
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Overview
The LT8640HUDC#PBF is a synchronous step-down Silent Switcher regulator from Analog Devices, housed in a QFN-18 package. It supports an input voltage range of 3.4 V to 42 V and delivers up to 5 A output current. The adjustable output voltage spans from 970 mV to 41.58 V. Operating frequencies are configurable between 200 kHz and 3 MHz. Quiescent current is specified at 300 uA. The device operates within a temperature range of -40°C to +150°C junction temperature.
Feature Summary
- Integrates Silent Switcher architecture for minimized electromagnetic interference radiation without external filters.
- Features synchronous buck topology with integrated power switches for high efficiency across load ranges.
- Includes shutdown functionality to reduce quiescent current consumption during inactive periods.
Applications
- Industrial automation control systems
- Distributed power supply architectures
- Point-of-load regulation for embedded processors
Procurement Notes
Verify the specific suffix #PBF indicates lead-free tape and reel or tube packaging as defined by manufacturer standards. Confirm that the HUDC variant meets the required thermal performance specifications for the intended operating environment. Ensure compatibility with existing PCB footprints for the QFN-18 package before finalizing procurement orders.
Selection Notes
Select this component when a wide input voltage range up to 42 V is required alongside high current capability. The adjustable switching frequency allows optimization for either size or efficiency. Consider the thermal requirements of the QFN-18 package for heat dissipation in dense layouts. Verify that the 300 uA quiescent current aligns with standby power constraints.
Part Context
This part belongs to the LT8640 series of Silent Switcher regulators. It shares architectural similarities with other members like the LT8640SEV but differs in package type and current rating. The series focuses on reducing EMI while maintaining high efficiency in compact form factors suitable for modern electronic designs.
Replacement Considerations
LT8640HUDC-1#PBF serves as a verified substitute within the same family. Cross-reference datasheets to ensure pinout and electrical parameter compatibility. Validate thermal characteristics and packaging differences before implementing any substitution in existing designs.
