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Product Detailed Parameters
- Description：IC REG BUCK ADJ 2A 10DFN
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube
- Function：Step-Down
- Output Configuration：Positive
- Topology：Buck
- Output Type：Adjustable
- Number of Outputs：1
- Voltage - Input (Min)：3.6V
- Voltage - Input (Max)：36V
- Voltage - Output (Min/Fixed)：0.79V
- Voltage - Output (Max)：20V
- Current - Output：2A
- Frequency - Switching：200kHz ~ 2.4MHz
- Synchronous Rectifier：No
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：10-WFDFN Exposed Pad
- Supplier Device Package：10-DFN (3x3)
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Overview
The LT3685IDD#PBF is a synchronous step-down switching regulator manufactured by Analog Devices Inc. It features an integrated high-side N-channel power switch capable of delivering up to 2A of output current. The device operates with an input voltage range from 3.6V to 36V and supports adjustable output voltages down to 0.79V. It utilizes a fixed 2.4MHz switching frequency, allowing for the use of small external components. The IC is housed in a thermally enhanced 10-lead DFN package (3mm x 3mm) with an exposed pad for improved heat dissipation.
Feature Summary
- Integrates a high-efficiency synchronous rectification architecture with an internal N-channel power switch.
- Supports programmable switching frequencies up to 2.4MHz to minimize passive component size.
- Includes cycle-by-cycle current limiting and soft-start functionality for robust operation.
Applications
- Industrial point-of-load regulation
- Automotive battery-powered systems
- Unregulated wall transformer power supplies
Procurement Notes
Verify the specific suffix IDD#PBF against the manufacturer's official datasheet to confirm the package type and temperature rating. Ensure compatibility with your PCB footprint design, as the DFN package requires specific thermal pad soldering techniques. Cross-reference the part number with authorized distributors to confirm current availability status and lead times prior to ordering.
Selection Notes
Select this component when a compact solution is required for converting higher input voltages to lower regulated outputs. The fixed 2.4MHz frequency is suitable for applications prioritizing small inductor and capacitor sizes over ultra-low EMI. Consider the thermal performance of the 3x3mm DFN package relative to your expected load current and ambient temperature conditions.
Part Context
This part belongs to the LT3685 family of synchronous buck regulators designed for wide input voltage ranges. It shares architectural similarities with other Linear Technology/Analog Devices converters like the LT3680 and LT3685EDD, differing primarily in package configuration and specific thermal characteristics defined by the IDD suffix.
Replacement Considerations
LT3685EDD#PBF: Identical electrical specifications but housed in a different DFN package variant. LT3685IMSE#PBF: Same functional performance but utilizes a 10-lead MSOP package instead of DFN.
