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Product Detailed Parameters
- Description：IC REG BUCK ADJ 1.2A 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)：4.3V
- Voltage - Input (Max)：38V
- Voltage - Output (Min/Fixed)：1.19V
- Voltage - Output (Max)：30V
- 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#PBF is a synchronous step-down switching regulator manufactured by Analog Devices Inc. It operates with an input voltage range of 4.3V to 38V and delivers up to 1.2A of output current. The device features an adjustable switching frequency from 200kHz to 2MHz and maintains a low quiescent current of 2.8µA during regulation, dropping to 1.7µA in standby mode. It utilizes a 10-lead DFN package with an exposed pad for thermal management and supports operation across a temperature range of -40°C to +125°C.
Feature Summary
- Synchronous buck topology integrates high-efficiency power switches
- Adjustable switching frequency allows optimization for size or efficiency
- Ultra-low quiescent current design minimizes power consumption at light loads
- Integrated soft-start controls inrush current during startup
Applications
- Industrial point-of-load regulation
- Battery-powered equipment power supplies
- Distributed power systems
- Automotive electronics
Procurement Notes
Verify the specific suffix #PBF indicates lead-free packaging compliant with RoHS standards. Confirm the IDD suffix corresponds to the 10-lead DFN package variant. Check manufacturer documentation for any recent pinout revisions or material declarations before finalizing procurement specifications.
Selection Notes
Select this component when a wide input voltage range up to 38V is required alongside compact surface-mount packaging. The adjustable frequency feature enables designers to optimize external component sizes while maintaining stable loop performance. Ensure the thermal requirements of the application are compatible with the DFN package's heat dissipation capabilities.
Part Context
This part belongs to the LT3971 family of high-voltage synchronous buck regulators. It shares core architectural features with variants like the LT3971IMSE#PBF but differs in package type and thermal characteristics. The family is designed for applications requiring efficient power conversion from higher voltage rails to lower logic levels.
Replacement Considerations
LT3971EMSE-3.3#PBF offers similar electrical performance in an MSOP package. LT3971EDD-3.3#PBF provides equivalent functionality with a fixed 3.3V output. Verify pin compatibility and thermal resistance differences when substituting these variants.
