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Product Detailed Parameters
- Description：IC REG BUCK 5V 1.2A 10MSOP
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube
- 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)：5V
- 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-5#PBF is a monolithic step-down switching regulator manufactured by Analog Devices Inc. It operates with an input voltage range of 4V to 55V and delivers a fixed 5V output at up to 1.2A. The device features a low quiescent current of 2.8µA and a shutdown supply current of 1.7µA. It integrates a 2MHz switching frequency, internal power switch, and diode. Packaged in a 10-lead MSOP, it supports operation from -40°C to +125°C.
Feature Summary
- Integrates a high-voltage NPN power switch capable of handling inputs up to 55V
- Provides fixed 5V output regulation with integrated synchronous rectification diode
- Features low quiescent current for efficient battery-powered applications
- Includes thermal shutdown and cycle-by-cycle current limit protection
Applications
- Industrial control systems requiring isolated or non-isolated power rails
- Battery-operated equipment needing extended runtime
- Automotive electronics within specified voltage ranges
- Point-of-load regulation in distributed power architectures
Procurement Notes
Verify the specific suffix #PBF indicates lead-free RoHS compliance when ordering. Confirm the MSOP-10 package availability through authorized distributors as stock levels may vary. Ensure the DC1526A evaluation board is available if prototyping is required. Check for any recent manufacturing changes or obsolescence notices directly from Analog Devices before finalizing procurement plans.
Selection Notes
Select this component when a fixed 5V output is required from a wide input voltage range up to 55V. The 1.2A output current suits moderate load applications. Consider the 2MHz switching frequency for smaller passive component sizes compared to lower-frequency alternatives. Verify that the MSOP-10 package fits the PCB layout constraints and thermal requirements of the target design.
Part Context
This part belongs to the LT3991 family of high-voltage buck regulators. It shares architectural similarities with the LT3990 but offers higher output current capability. The EMSE-5 variant specifically denotes the MSOP-10 package and fixed 5V output configuration. It is designed for compact designs where space and efficiency are critical constraints.
Replacement Considerations
LT3990EMSE-5#PBF offers similar functionality with lower output current (350mA). LT3991IMSE-5#PBF provides the same electrical specifications but may differ in temperature grade or packaging details. Verify pin compatibility and thermal performance when substituting.
