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Product Detailed Parameters
- Description：IC REG BUCK 3.3V 1.2A 10MSOP
- 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)：55V
- 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-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Supplier Device Package：10-MSOP-EP
- Grade：-
- Qualification：-
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Overview
The LT3991IMSE-3.3#PBF is a monolithic buck switching regulator from Analog Devices Inc., housed in a 10-TFSOP package with an exposed pad. It provides a fixed positive output voltage of 3.3V at a maximum current of 1.2A. The device accepts an input voltage range from 4.3V to 55V and features an adjustable switching frequency between 200kHz and 2MHz. It operates within a junction temperature range of -40°C to 125°C.
Feature Summary
- Accepts wide input voltage range up to 55V
- Low quiescent current design for efficiency
- Includes power good flag indicating when output reaches regulation
Applications
- Industrial control systems requiring isolated or non-isolated DC-DC conversion
- Automotive electronics operating within specified voltage limits
- Portable equipment powered by single-cell lithium-ion batteries or higher voltage sources
Procurement Notes
Verify the specific suffix #PBF indicates lead-free RoHS compliance. Confirm the IMSE variant corresponds to the 10-TFSOP package rather than DFN. Ensure the application circuit matches the fixed 3.3V output requirement, as other variants offer adjustable or different fixed voltages.
Selection Notes
Select this part when a fixed 3.3V output is required with high input voltage capability up to 55V. Choose the TFSOP package if board space allows for slightly larger footprint compared to DFN options. Consider the 1.2A current limit for load requirements and verify thermal management needs for the exposed pad design.
Part Context
This component belongs to the LT3991 family of step-down regulators designed for high-voltage applications. Unlike the adjustable LT3991IDD, this version provides a fixed 3.3V output. It shares core architecture with other LT3991 variants but differs in output configuration and package type, specifically utilizing the MSOP/TFSOP form factor.
Replacement Considerations
LT3991IMSE-3.3#TRPBF offers identical electrical specifications in a tape-and-reel packaging format instead of tube. Other LT3991 variants with different output voltages or adjustable settings are not direct pin-compatible replacements without circuit modification.
