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Product Detailed Parameters
- Description：IC REG BUCK ADJ 1.2A 10MSOP
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube
- Function：Step-Down
- Output Configuration：Positive
- Topology：Buck
- Output Type：Adjustable
- Number of Outputs：1
- Voltage - Input (Min)：4.3V
- Voltage - Input (Max)：38V
- Voltage - Output (Min/Fixed)：1.19V
- Voltage - Output (Max)：30V
- 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#PBF is a synchronous step-down switching regulator manufactured by Analog Devices Inc. It operates with an input voltage range of 4.3V to 38V and delivers a fixed output voltage of 5V at up to 1.2A. The device features a 2MHz switching frequency and ultra-low quiescent current of 2.8µA during regulation, dropping to 1.7µA in shutdown mode. Packaged in a 10-lead MSOP with an exposed thermal pad, it supports operation from -40°C to +125°C junction temperature.
Feature Summary
- Synchronous buck topology for high efficiency across load ranges
- Ultra-low quiescent current design for battery-powered applications
- Internal soft-start controls inrush current during startup
- Power good flag indicates when output reaches regulation threshold
Applications
- Automotive electronics requiring wide input voltage tolerance
- Industrial systems needing efficient DC-DC conversion
- Portable devices utilizing battery power sources
- Embedded controllers requiring stable 5V supply rails
Procurement Notes
Verify the specific suffix #PBF confirms lead-free compliance and tube packaging format. Confirm the IMSE variant matches the required MSOP package dimensions and thermal performance specifications for your PCB layout. Ensure the fixed 5V output aligns with system requirements, as adjustable versions exist within the same family.
Selection Notes
Select this component when a fixed 5V output is required alongside high efficiency and low standby power consumption. The 1.2A current capability suits moderate load applications. Consider the 2MHz frequency for smaller external passive components compared to lower-frequency alternatives. Verify thermal dissipation requirements given the compact MSOP package size.
Part Context
This part belongs to the LT3971 family of monolithic buck regulators designed for high efficiency and low noise. It integrates a high-side N-channel switch and boost diode, eliminating the need for external Schottky diodes. The family includes adjustable and fixed voltage variants, offering flexibility for various power management needs in space-constrained designs.
Replacement Considerations
LT3971EMSE-5#PBF offers identical electrical characteristics but utilizes an MSOP package instead of DFN. LT3971EDD-5#PBF provides similar functionality in a DFN package. Verify pinout compatibility and thermal pad connections when substituting between MSOP and DFN packages.
