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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)：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 LT3971IMSE-3.3#TRPBF is a fixed-output buck switching regulator from Analog Devices, delivering a stable 3.3V output at up to 1.2A. It operates within a wide input voltage range of 4.3V to 38V and supports adjustable switching frequencies up to 2MHz. The device features an ultra-low quiescent current of 2.8µA during regulation and reduces to 700nA in shutdown mode. Packaged in a compact 10-lead MSOP with an exposed thermal pad, it ensures efficient power management for space-constrained applications.
Feature Summary
- Ultra-low quiescent current design minimizes power consumption during operation and standby states
- Burst Mode operation maintains high efficiency at light loads while keeping output ripple low
- Integrated soft-start and power good flag ensure controlled startup and reliable system monitoring
- Internally compensated current-mode topology provides fast transient response and loop stability
Applications
- Portable battery-powered equipment requiring extended runtime
- Industrial control systems with wide input voltage variations
- Embedded computing modules needing efficient step-down conversion
- Automotive electronics operating under varying load conditions
Procurement Notes
Verify the specific suffix #TRPBF indicates tape-and-reel packaging when sourcing components. Confirm that the fixed 3.3V output variant matches the target circuit requirements rather than the adjustable version. Ensure the manufacturer part number corresponds to the intended package type and temperature grade before finalizing procurement orders.
Selection Notes
Select this component for designs requiring high efficiency across wide input ranges without external compensation. Consider the 1.2A current limit and 38V maximum input voltage when sizing passive components. Evaluate thermal performance based on the MSOP package's exposed pad capabilities for heat dissipation in dense layouts.
Part Context
This part belongs to the LT3971 family of monolithic buck regulators designed for high-efficiency power conversion. It shares architectural similarities with other members like the LT3971A but offers a fixed output voltage option. The series emphasizes low quiescent current and compact packaging for modern portable and industrial applications.
Replacement Considerations
Direct substitutes include other Analog Devices buck regulators with similar voltage and current ratings, such as the LT3971EMSE-3.3#PBF for tube packaging or the LT3971A-5 variants for USB-specific current specifications. Verify pin compatibility and thermal characteristics when cross-referencing.
