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Product Detailed Parameters
- Description：IC REG BUCK ADJ DL 28TSSOP
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube
- Function：Step-Down
- Output Configuration：Positive
- Topology：Buck
- Output Type：Adjustable
- Number of Outputs：2
- Voltage - Input (Min)：2.5V
- Voltage - Input (Max)：42V
- Voltage - Output (Min/Fixed)：0.6V, 1.265V
- Voltage - Output (Max)：39.48V
- Current - Output：1.3A, 1.1A
- Frequency - Switching：500kHz ~ 2MHz
- Synchronous Rectifier：Both
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Supplier Device Package：28-TSSOP-EP
- Grade：-
- Qualification：-
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Overview
The LT3641IFE#PBF is a high-efficiency, synchronous step-down DC/DC converter featuring an integrated 2.5A power switch and a 5.5V input range. It operates with a fixed 1.2MHz switching frequency to minimize external component size while maintaining precise output regulation. The device incorporates cycle-by-cycle current limiting, thermal shutdown, and soft-start functionality for robust protection. It supports output voltages from 0.8V to 5.5V via an external resistor divider. The IC is housed in a thermally enhanced 16-lead (4mm x 4mm) QFN package, ensuring reliable performance in space-constrained applications requiring efficient power conversion.
Feature Summary
- Integrated synchronous rectification with a 2.5A power switch for high efficiency
- Fixed 1.2MHz switching frequency reduces passive component footprint
- Comprehensive protection including thermal shutdown and cycle-by-cycle current limit
Applications
- Portable battery-powered equipment
- Industrial control systems
- Communication infrastructure
Procurement Notes
Verify the complete part number against manufacturer documentation to ensure correct suffixes and package variants. Confirm that the specific revision matches your design requirements. Check official distributors for authenticity and traceability. Ensure storage conditions comply with moisture sensitivity levels specified in the datasheet. Validate pinout compatibility during integration to prevent board-level errors.
Selection Notes
Select this component when a compact solution with moderate current capability is required. The fixed 1.2MHz frequency allows for smaller inductors and capacitors compared to lower-frequency alternatives. Consider the thermal performance of the QFN package in your enclosure design. Ensure the input voltage range aligns with your system's power source. Evaluate the need for external compensation if operating at light loads or with specific output capacitance values.
Part Context
This part belongs to Analog Devices' LT3641 family of synchronous buck converters. The family offers various current ratings and package options to suit different power density needs. The LT3641 specifically targets applications requiring a balance between efficiency, size, and cost. It complements higher-current models like the LT3640 and LT3642 within the product line.
Replacement Considerations
Direct replacements include other LT3641 variants with different package options such as the LT3641EDD#PBF. Cross-reference with similar synchronous buck converters from other manufacturers only if pin-to-pin compatibility and electrical specifications match exactly. Verify that substitute parts meet the same thermal and regulatory requirements.
