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Product Detailed Parameters
- Description：IC REG BUCK 3.3V 750MA 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)：4.2V
- Voltage - Input (Max)：42V
- Voltage - Output (Min/Fixed)：3.3V
- Voltage - Output (Max)：-
- Current - Output：750mA
- Frequency - Switching：195kHz ~ 2.15MHz
- 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 LT3973IMSE-3.3#TRPBF is a monolithic buck switching regulator manufactured by Analog Devices Inc., housed in an MSOP-10 package with exposed pad. It delivers a fixed 3.3V output at up to 750mA. The device accepts an input voltage range of 4.2V to 42V and features an adjustable switching frequency from 195kHz to 2.15MHz. It operates within a junction temperature range of -40°C to 125°C and consumes only 2.5µA of quiescent current.
Feature Summary
- Adjustable switching frequency allows optimization for efficiency or component size
- Ultra-low quiescent current supports battery-powered applications
- Wide input voltage range accommodates various power sources
- Integrated synchronous rectification improves conversion efficiency
Applications
- Industrial control systems requiring stable 3.3V logic supplies
- Automotive electronics operating on 12V or 24V networks
- Portable instrumentation powered by single-cell lithium batteries
- Embedded controllers needing efficient step-down regulation
Procurement Notes
Verify the suffix #TRPBF indicates tape-and-reel packaging when ordering. Confirm the IMSE variant meets industrial temperature specifications (-40°C to 125°C). Ensure compatibility with the required output voltage configuration, as this specific part number provides a fixed 3.3V output. Cross-reference the manufacturer's latest datasheet for pinout and thermal pad requirements.
Selection Notes
Select this component when a fixed 3.3V output is required alongside wide input voltage tolerance up to 42V. The adjustable frequency feature enables designers to balance electromagnetic interference (EMI) performance against external inductor size. Consider the MSOP-10 package constraints for PCB layout and thermal dissipation needs relative to the 750mA load capability.
Part Context
This part belongs to the LT3973 family of high-efficiency, low-noise buck regulators. The IMSE designation specifies the industrial temperature grade and MSOP-10 package. The #TRPBF suffix denotes lead-free status and tape-and-reel shipping format. It complements other variants offering different fixed voltages or adjustable output configurations within the same functional architecture.
Replacement Considerations
LT3973IMSE-3.3#PBF offers identical electrical characteristics but in tube packaging instead of tape-and-reel. Other LT3973 variants with different fixed outputs (e.g., 5V, 1.8V) share the same pinout and functionality but provide different regulated voltages.
