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Product Detailed Parameters
- Description：IC REG BUCK 3.3V 1.2A 10DFN
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube
- Function：Step-Down
- Output Configuration：Positive
- Topology：Buck
- Output Type：Fixed
- Number of Outputs：1
- Voltage - Input (Min)：4.3V
- Voltage - Input (Max)：38V
- Voltage - Output (Min/Fixed)：3.3V
- Voltage - Output (Max)：-
- Current - Output：1.2A
- Frequency - Switching：200kHz ~ 2MHz
- 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 LT3971IDD-3.3#PBF is a synchronous step-down switching regulator manufactured by Analog Devices Inc., housed in a 10-pin DFN package. It delivers a fixed 3.3V output at up to 1.2A with an input voltage range of 4.3V to 38V. The device operates at a 2MHz switching frequency and features ultra-low quiescent current of 2.8µA during active regulation and 1.7µA during shutdown. It supports adjustable frequency operation from 200kHz to 2.2MHz, functions within a -40°C to +125°C temperature range, and includes integrated protection features.
Feature Summary
- Integrates high-side and low-side N-channel power switches for efficient synchronous rectification
- Provides constant on-time control architecture for fast transient response
- Includes comprehensive protection mechanisms against over-current, thermal overload, and reverse current
- Features programmable soft-start and frequency synchronization capabilities
Applications
- Industrial automation systems requiring isolated or non-isolated power rails
- Automotive electronics operating under wide input voltage variations
- Portable instrumentation powered by single-cell lithium batteries
- Embedded controller logic supply generation
Procurement Notes
Verify component authenticity through authorized distribution channels due to limited availability status. Confirm RoHS compliance documentation matches the specific manufacturing lot. Ensure storage conditions adhere to moisture sensitivity level requirements prior to soldering. Validate that the DFN-10 footprint aligns with PCB design specifications to prevent thermal or mechanical mismatch issues during assembly.
Selection Notes
Select this model when a fixed 3.3V rail is required with high efficiency across a broad input range. The 1.2A capacity suits moderate load applications without external passives. Consider the 10-pin DFN package for space-constrained designs. Evaluate the 2MHz default frequency against EMI constraints; lower frequencies may be achieved via synchronization pin usage. Compare against LT3970 if lower current or different topology is needed.
Part Context
This component belongs to the LT3971 family of micropower synchronous buck regulators designed for high-efficiency power management. It shares architectural similarities with the LT3970 but offers higher output current capability. The IDD suffix denotes the specific DFN-10 package variant, while the #PBF indicates lead-free tin finish packaging compliant with environmental standards.
Replacement Considerations
- LT3971EDD-3.3#PBF
- LT3971EMSE-3.3#PBF
FAQ
How does the LT3971 handle reverse current flow?
The device integrates a reverse current protection feature that prevents inductor discharge back into the input source when the load is removed or during light-load conditions, maintaining system stability.
What is the purpose of the SYNC pin?
The SYNC pin allows the internal oscillator to be synchronized to an external clock signal, enabling phase shifting or noise reduction by aligning multiple converters to a common frequency reference.
