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Product Detailed Parameters
- Description：IC REG BUCK ADJ 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：Adjustable
- Number of Outputs：1
- Voltage - Input (Min)：4.3V
- Voltage - Input (Max)：55V
- 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
- Grade：-
- Qualification：-
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Overview
The LT3991EMSE#TRPBF is a monolithic step-down DC/DC switching regulator manufactured by Analog Devices Inc. It operates with an input voltage range of 4.5V to 55V and provides an adjustable output voltage from 1.21V to 25V. The device delivers a maximum output current of 1.2A with a switchable frequency between 200kHz and 2MHz. It features a low quiescent current of 2.8µA and operates within a junction temperature range of -40°C to 125°C. The component is housed in a 10-MSOP package with an exposed pad.
Feature Summary
- Adjustable switching frequency allows optimization for efficiency or external component size
- Low quiescent current supports extended battery life in portable applications
- Wide input voltage range accommodates various power source configurations
Applications
- Battery-powered portable equipment requiring efficient voltage regulation
- Industrial systems utilizing wide input voltage ranges
- General-purpose step-down power supply designs
Procurement Notes
Verify the specific suffix #TRPBF indicates tape and reel packaging when sourcing. Confirm the manufacturer is Analog Devices Inc. Ensure the part number matches the exact electrical specifications required for your design, particularly the 1.2A output current and 55V maximum input rating. Cross-reference datasheets for latest revisions.
Selection Notes
Select this component for designs requiring a compact buck regulator with high input voltage tolerance. Compare against the LT3990 if lower current (350mA) and higher input voltage (62V) are sufficient. Consider the MSOP package constraints for thermal management at full load. Verify that the adjustable frequency range meets EMI requirements.
Part Context
This part belongs to the LT3991 family of high voltage step-down regulators. It shares architectural similarities with the LT3990 but offers higher output current capability. The EMSE designation specifies the 10-lead MSOP package with an exposed thermal pad, distinguishing it from other package options like DFN.
Replacement Considerations
LT3991EMSE#PBF is a tube-packaged equivalent of the same functional device. LT3990EMSE#TRPBF serves as a lower-current alternative with a wider input voltage range. Verify pin compatibility and thermal performance before substitution.
