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Product Detailed Parameters
- Description：IC REG BUCK 3.3V 1.2A 10MSOP
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tape & Reel (TR)
- 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#TRPBF is a monolithic step-down DC/DC switching regulator manufactured by Analog Devices Inc. It operates with an input voltage range of 4.5V to 55V and provides a fixed 3.3V output at up to 1.2A. The device features a low quiescent current of 2.8uA and supports adjustable switching frequencies up to 2MHz. Packaged in a 10-DFN (3x3) surface-mount format, it functions within a temperature range of -40°C to +125°C.
Feature Summary
- Monolithic buck topology designed for high-voltage input applications
- Ultra-low quiescent current consumption for battery efficiency
- Adjustable switching frequency allows optimization for size or noise
- Integrated thermal regulation protects against overheating
Applications
- Industrial control systems requiring wide input voltage ranges
- Automotive electronics operating on 12V or 24V nominal buses
- Portable instrumentation powered by single-cell lithium batteries
- Telecommunications infrastructure power distribution
Procurement Notes
Verify the specific suffix #TRPBF indicates tape-and-reel packaging when ordering. Confirm the IMSE grade meets required temperature specifications. Ensure compatibility with LTpowerCAD design tools for schematic generation. Check manufacturer documentation for any recent product change notifications affecting pinout or materials.
Selection Notes
Select this component when a fixed 3.3V output is required from inputs exceeding 55V. Compare against the LT3990 if higher current capability is needed. Consider the LT3971 series for lower input voltage constraints under 38V. Evaluate external component requirements based on the chosen switching frequency setting.
Part Context
This part belongs to the LT3991 family of high-voltage step-down regulators. It shares architectural similarities with the LT3990 but offers different current ratings and package options. The IMSE variant denotes industrial temperature performance in a compact DFN footprint suitable for space-constrained designs.
Replacement Considerations
LT3991EMSE-3.3#TRPBF serves as the commercial grade equivalent. LT3991IDD#PBF offers the same functionality in a tube-packaged DFN format. Verify pin compatibility before substituting with other Buck regulators from the manufacturer portfolio.
