LT3975

PRODUCTION

42V, 2.5A, 2MHz Step-Down Switching Regulator with 2.7µA Quiescent Current

Data Sheet Product Selection Table

Part Models: 6
1ku List Price: Starting From $3.72

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Part Details

Ultralow Quiescent Current:
- 2.7μA I_Q at 12V_IN to 3.3V_OUT
Low Ripple Burst Mode^® Operation
- Output Ripple < 15mV_P-P
Wide Input Range: Operation from 4.3V to 42V
2.5A Maximum Output Current
Excellent Start-Up and Dropout Performance
Adjustable Switching Frequency: 200kHz to 2MHz
Synchronizable Between 250kHz to 2MHz
Accurate Programmable Undervoltage Lockout
Low Shutdown Current: I_Q = 700nA
Power Good Flag
Soft-Start Capability
Thermal Shutdown Protection
Current Limit Foldback with Soft-Start Override
Saturating Switch Design: 75mΩ On Resistance
Small, Thermally Enhanced 16-Lead MSOP Package

Part Models: 6
1ku List Price: Starting From $3.72

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LT3975EMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3975EMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3975HMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3975HMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3975IMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3975IMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 17, 2025 - 25_0119 Bond Wire Change from Gold to Copper (Automotive)
		PCN25_0119_Form Material_Report Delta Qualification Matrix Qualification Results Summary
LT3975EMSE#PBF	PRODUCTION
LT3975EMSE#TRPBF	PRODUCTION
LT3975IMSE#PBF	PRODUCTION
LT3975IMSE#TRPBF	PRODUCTION
Oct 11, 2022 - 22_0244 Epoxy Change from Henkel 8290 to 8290A for MSOP Package
		PCN22_0244_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LT3975EMSE#PBF	PRODUCTION
LT3975EMSE#TRPBF	PRODUCTION
LT3975HMSE#PBF	PRODUCTION
LT3975HMSE#TRPBF	PRODUCTION
LT3975IMSE#PBF	PRODUCTION
LT3975IMSE#TRPBF	PRODUCTION
Feb 4, 2020 - 20_0132 Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0132_Form Material_Report
LT3975EMSE#PBF	PRODUCTION
LT3975EMSE#TRPBF	PRODUCTION
LT3975HMSE#PBF	PRODUCTION
LT3975HMSE#TRPBF	PRODUCTION
LT3975IMSE#PBF	PRODUCTION
LT3975IMSE#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

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PowerPath, Ideal Diodes, and Load Switches 1
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LTC6908		Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit

Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

LT3975

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

LT3975 Demo Board I 4.3V ≤ VIN ≤ 42V; VOUT = 3.3V @ 2.5A

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Product Details

Demonstration circuit 1736A is a monolithic step-down DC/DC switching regulator featuring the LT3975. The demo circuit is designed for 3.3V, 2.5A output from a 4.3V to 42V input.