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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),Cut Tape (CT)
- 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-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Supplier Device Package：10-MSOP-EP
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Overview
The LT3971EMSE-3.3#TRPBF is a synchronous step-down switching regulator manufactured by Analog Devices Inc., housed in a 10-lead MSOP package with an exposed thermal pad. It provides a fixed 3.3V output capable of delivering up to 1.2A of continuous current. The device operates from an input voltage range of 4.3V to 38V and supports adjustable switching frequencies between 200kHz and 2MHz. It features low quiescent current consumption, typically 2.8µA during regulation and 700nA in shutdown mode. The component is rated for operation over an extended temperature range of -40°C to +125°C junction temperature.
Feature Summary
- Synchronous buck topology integrates high-efficiency internal power switches
- Adjustable switching frequency allows optimization for size or efficiency
- Burst Mode operation maintains high efficiency at light loads while minimizing output ripple
- Integrated soft-start controls inrush current during startup
Applications
- Point-of-load regulation for industrial equipment
- Power supply stages for automotive electronics
- Battery-powered systems requiring low standby current
- Embedded computing platforms needing stable 3.3V rails
Procurement Notes
Verify the specific suffix #TRPBF confirms tape-and-reel packaging when ordering. Confirm the base part number LT3971EMSE-3.3 matches the required fixed 3.3V output variant. Ensure the MSOP-EP package footprint aligns with the PCB layout design. Check for any recent product change notices regarding epoxy or marking updates.
Selection Notes
Select this component when a fixed 3.3V output is required without external feedback resistors. The wide input voltage range suits applications powered by single-cell lithium batteries or higher bus voltages. Consider the thermal performance of the exposed pad for high-current applications. Verify that the chosen switching frequency does not interfere with sensitive analog circuits in the system.
Part Context
This part belongs to the LT3971 family of ultra-low quiescent current buck regulators. It shares architectural similarities with the LT3970 and LT3973 but offers specific current and voltage ratings tailored for general-purpose DC-DC conversion. The EMSE designation indicates the MSOP package variant, distinguishing it from DFN versions like the LT3971EDD.
Replacement Considerations
LT3971EMSE-3.3#PBF is the tube-packaged equivalent of this reel-part. LT3971IMSE-3.3#TRPBF represents the industrial temperature grade version. Cross-reference datasheets for pinout compatibility and thermal characteristics before substitution.
