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Product Detailed Parameters
- Description：IC REG BUCK 5V 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)：5V
- 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-5#PBF is a monolithic buck switching regulator from Analog Devices, housed in a 10-lead DFN package. It accepts an input voltage range of 4.3V to 38V and provides a fixed 5V output at up to 1.2A. The device features a 2MHz adjustable switching frequency and ultra-low quiescent current of 2.8µA during regulation, dropping to 1.7µA in operation and 700nA in shutdown. Operating temperature ranges from -40°C to +125°C.
Feature Summary
- Ultra-low quiescent current design maintains high efficiency at light loads while keeping output ripple below 15mV.
- Internally compensated current mode topology ensures fast transient response and loop stability.
- Capacitor on the soft-start pin provides controlled inrush current management.
- Power good flag signals when the output voltage reaches 91% of the programmed level.
Applications
- USB-powered applications requiring specified VOUT pin current characteristics
- Battery-powered systems demanding extended standby life
- Industrial equipment with wide input voltage requirements
Procurement Notes
Verify component authenticity through authorized channels due to limited supply status. Confirm RoHS compliance details and check for specific factory order constraints. Ensure the DFN-10 package matches PCB footprint requirements before finalizing procurement decisions.
Selection Notes
Select this part for designs requiring a fixed 5V output from high-voltage inputs. The 1.2A current rating suits moderate load applications. Consider the 2MHz frequency for smaller passive components. Verify thermal performance within the exposed pad DFN package for the target environment.
Part Context
This component belongs to the LT3971 series of step-down regulators. It shares architectural similarities with the LT3971A but offers specific USB application characteristics including specified VOUT pin current and absolute maximum current ratings. The IDD suffix indicates the DFN-10 package variant.
Replacement Considerations
LT3971A-5#PBF offers improved reference accuracy and specified USB-related current limits. LT3971-5 variants provide similar functionality with potentially different reference specifications. Verify package compatibility and electrical parameter alignment when substituting.
