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Product Detailed Parameters
- Description：IC REG BUCK 3.3V 5A 20QFN
- Series：Silent Switcher®1
- Mfr：Analog Devices Inc.
- Package：Tube
- 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#PBF is a synchronous step-down switching regulator from Analog Devices, part of the LT8640A series. It operates with 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 features a switch frequency of 1.95 MHz and ultra-low quiescent currents of 750 nA during operation and 20 nA in shutdown mode. Packaged in a QFN-18 footprint, it supports surface mount installation and functions within a junction temperature range of -40°C to +150°C.
Feature Summary
- Fixed 3.3 V output configuration for simplified design
- Ultra-low quiescent current consumption in active and shutdown modes
- Integrated synchronous rectification for high efficiency
- Wide input voltage tolerance supporting various power sources
Applications
- Industrial control systems requiring stable low-voltage rails
- Automotive electronics compliant with wide input ranges
- Distributed power architectures in telecom infrastructure
- Battery-powered devices needing extended standby life
Procurement Notes
Verify the specific suffix '-3.3' confirms the fixed 3.3 V output variant against the manufacturer's official datasheet. Ensure the 'J' or 'I' grade designation matches your thermal requirements, as operating temperatures vary by grade. Confirm package type QFN-18 compatibility with your PCB footprint. Cross-reference the '#PBF' lead-free marking with RoHS directives if required for your region.
Selection Notes
Select this component when a fixed 3.3 V rail is needed without external feedback resistors. Compare the 1.95 MHz fixed frequency against adjustable variants if EMI filtering constraints differ. Evaluate the 8 A peak current capability against transient load demands. Consider the QFN-18 thermal pad requirements for adequate heat dissipation in enclosed environments compared to larger packages.
Part Context
This part belongs to the LT8640A family of Silent Switcher regulators designed for high efficiency and low electromagnetic interference. Unlike the standard LT8640 which offers adjustable outputs, the AJUDCM variant provides a fixed 3.3 V output. It shares the core topology with other LT8640 models but is optimized for applications requiring a specific voltage level without additional programming components.
Replacement Considerations
LT8640AJUDCF#PBF: Similar fixed 3.3 V output but in a different QFN-20 package. LT8640IUDC-1#PBF: Adjustable output version in QFN-18, requires external resistor network. LT8640SAAV#PBF: Higher current 6 A version in QFN-24 package.
