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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)：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 LT3991EMSE-3.3#TRPBF is a monolithic step-down DC/DC switching regulator manufactured by Analog Devices Inc., featuring the LT3991 controller in a 10-WFDFN package with an exposed pad. It delivers a fixed 3.3V output at up to 1.2A from an input voltage range of 4.5V to 55V. The device supports adjustable switching frequencies up to 2MHz and maintains a low quiescent current of 2.8uA. Designed for surface mount installation, it operates within a junction temperature range of -40°C to 125°C.
Feature Summary
- Supports high input voltages up to 55V for wide-range power applications
- Provides fixed 3.3V output with 1.2A continuous current capability
- Features ultra-low 2.8uA quiescent current for battery efficiency
- Allows flexible switching frequency adjustment up to 2MHz
Applications
- Industrial control systems requiring robust power regulation
- Automotive electronics operating under varying supply conditions
- Battery-powered devices needing extended operational life
- Embedded systems utilizing high-voltage bus architectures
Procurement Notes
Verify the specific suffix #TRPBF indicates tape and reel packaging when sourcing components. Confirm that the fixed 3.3V output variant matches your circuit requirements, as other output voltages exist within the LT3991 family. Ensure compatibility with the 10-WFDFN footprint during PCB layout preparation.
Selection Notes
Select this component when a fixed 3.3V rail is required alongside high input voltage tolerance. Consider the 1.2A current limit for moderate load applications. Evaluate the 2.8uA quiescent current against system standby requirements. Compare the 10-WFDFN package size against available board space constraints relative to alternative MSOP packages.
Part Context
This part belongs to the LT3991 series of high-voltage buck regulators designed for demanding environments. It shares architectural similarities with the LT3990 but offers higher current capacity. The EMSE designation identifies the specific MSOP-style DFN thermal package optimized for heat dissipation in compact designs.
Replacement Considerations
LT3991EMSE-3.3#PBF serves as the tube-packaged equivalent. LT3991EDD#TRPBF provides an adjustable output version in a similar DFN form factor. LT3991EMSE-5#PBF offers a fixed 5V output option within the same series.
