LTC3637

RECOMMENDED FOR NEW DESIGNS

76V, 1A Step-Down Regulator

Data Sheet (Rev. D) Product Selection Table

Part Models: 18
1ku List Price: Starting From $3.84

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Overview

Wide Operating Input Voltage Range: 4V to 76V
Internal 350mΩ Power MOSFET
No Compensation Required
Adjustable 100mA to 1A Maximum Output Current
Low Dropout Operation: 100% Duty Cycle
Low Quiescent Current: 12μA
Wide Output Range: 0.8V to V_IN
0.8V ±1% Feedback Voltage Reference

Precise RUN Pin Threshold
Internal and External Soft-Start
Programmable 1.8V, 3.3V, 5V or Adjustable Output
Few External Components Required
Programmable Input Overvoltage Lockout
Low Profile (0.75mm) 3mm × 5mm DFN and Thermally-Enhanced MSE16 Packages
AEC-Q100 Qualified for Automotive Applications

The LTC3637 is a high efficiency step-down DC/DC regulator with an internal high side power switch that draws only 12μA DC supply current while maintaining a regulated output voltage at no load.

The LTC3637 can supply up to 1A load current and features a programmable peak current limit that provides a simple method for optimizing efficiency and for reducing output ripple and component size. The LTC3637’s combination of Burst Mode^® operation, integrated power switch, low quiescent current, and programmable peak current limit provides high efficiency over a broad range of load currents.

With its wide input range of 4V to 76V, and programmable overvoltage lockout, the LTC3637 is a robust regulator suited for regulating from a wide variety of power sources. Additionally, the LTC3637 includes a precise run threshold and soft-start feature to guarantee that the power system start-up is well-controlled in any environment.

The LTC3637 is available in the thermally-enhanced 3mm × 5mm DFN and the MSE16 packages.

APPLICATIONS

Industrial Control Supplies
Medical Devices
Distributed Power Systems
Portable Instruments
Battery-Operated Devices
Automotive
Avionics

Part Models: 18
1ku List Price: Starting From $3.84

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
LTC3637EDHC#PBF	16-Lead DFN (5mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3637EDHC#TRPBF	16-Lead DFN (5mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3637EMSE#PBF	16(12)-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3637EMSE#TRPBF	16(12)-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3637HDHC#PBF	16-Lead DFN (5mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3637HDHC#TRPBF	16-Lead DFN (5mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3637HMSE#PBF	16(12)-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3637HMSE#TRPBF	16(12)-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3637IDHC#PBF	16-Lead DFN (5mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3637IDHC#TRPBF	16-Lead DFN (5mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3637IMSE#PBF	16(12)-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3637IMSE#TRPBF	16(12)-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3637JMSE#WPBF	16(12)-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3637JMSE#WTRPBF	16(12)-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3637MPDHC#PBF	16-Lead DFN (5mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3637MPDHC#TRPBF	16-Lead DFN (5mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3637MPMSE#PBF	16(12)-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3637MPMSE#TRPBF	16(12)-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 17, 2025 - 25_0043 Change of Gold to Copper Wire and BOM (Automotive)
		PCN25_0043_Form Material_Report Delta Qualification Matrix Qualification Results Summary
LTC3637EDHC#PBF	PRODUCTION
LTC3637EDHC#TRPBF	PRODUCTION
LTC3637HDHC#PBF	PRODUCTION
LTC3637HDHC#TRPBF	PRODUCTION
LTC3637IDHC#PBF	PRODUCTION
LTC3637IDHC#TRPBF	PRODUCTION
Mar 25, 2025 - 25_0033 LTC3637 Die Revision
		PCN25_0033_Form Material_Report Delta Qualification Matrix Qualification Results Summary Qualification Results Summary
LTC3637EDHC#PBF	PRODUCTION
LTC3637EDHC#TRPBF	PRODUCTION
LTC3637EMSE#PBF	PRODUCTION
LTC3637EMSE#TRPBF	PRODUCTION
LTC3637HDHC#PBF	PRODUCTION
LTC3637HDHC#TRPBF	PRODUCTION
LTC3637HMSE#PBF	PRODUCTION
LTC3637HMSE#TRPBF	PRODUCTION
LTC3637IDHC#PBF	PRODUCTION
LTC3637IDHC#TRPBF	PRODUCTION
LTC3637IMSE#PBF	PRODUCTION
LTC3637IMSE#TRPBF	PRODUCTION
LTC3637JMSE#WPBF	PRODUCTION
LTC3637JMSE#WTRPBF	PRODUCTION
LTC3637MPDHC#PBF	PRODUCTION
LTC3637MPDHC#TRPBF	PRODUCTION
LTC3637MPMSE#PBF	PRODUCTION
LTC3637MPMSE#TRPBF	PRODUCTION
Jul 31, 2020 - 20_0245 Notification of Wafer Fab Location Change for 0.6µm BICMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan)
		PCN20_0245_Form Material_Report Delta Qualification Matrix Other Qualification Results Summary
LTC3637EDHC#PBF	PRODUCTION
LTC3637EDHC#TRPBF	PRODUCTION
LTC3637EMSE#PBF	PRODUCTION
LTC3637EMSE#TRPBF	PRODUCTION
LTC3637HDHC#PBF	PRODUCTION
LTC3637HDHC#TRPBF	PRODUCTION
LTC3637HMSE#PBF	PRODUCTION
LTC3637HMSE#TRPBF	PRODUCTION
LTC3637IDHC#PBF	PRODUCTION
LTC3637IDHC#TRPBF	PRODUCTION
LTC3637IMSE#PBF	PRODUCTION
LTC3637IMSE#TRPBF	PRODUCTION
LTC3637MPDHC#PBF	PRODUCTION
LTC3637MPDHC#TRPBF	PRODUCTION
LTC3637MPMSE#PBF	PRODUCTION
LTC3637MPMSE#TRPBF	PRODUCTION
Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)
		PCN24_0003_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC3637EMSE#PBF	PRODUCTION
LTC3637EMSE#TRPBF	PRODUCTION
LTC3637HMSE#PBF	PRODUCTION
LTC3637HMSE#TRPBF	PRODUCTION
LTC3637IMSE#PBF	PRODUCTION
LTC3637IMSE#TRPBF	PRODUCTION
LTC3637JMSE#WPBF	PRODUCTION
LTC3637JMSE#WTRPBF	PRODUCTION
LTC3637MPMSE#PBF	PRODUCTION
LTC3637MPMSE#TRPBF	PRODUCTION
Feb 4, 2020 - 20_0129 Laser Mark Conversion for 12-Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0129_Form Material_Report
LTC3637EMSE#PBF	PRODUCTION
LTC3637EMSE#TRPBF	PRODUCTION
LTC3637HMSE#PBF	PRODUCTION
LTC3637HMSE#TRPBF	PRODUCTION
LTC3637IMSE#PBF	PRODUCTION
LTC3637IMSE#TRPBF	PRODUCTION
LTC3637MPMSE#PBF	PRODUCTION
LTC3637MPMSE#TRPBF	PRODUCTION
Apr 17, 2025 - 25_0119 Bond Wire Change from Gold to Copper (Automotive)
		PCN25_0119_Form Material_Report Delta Qualification Matrix Qualification Results Summary
LTC3637HMSE#PBF	PRODUCTION
LTC3637HMSE#TRPBF	PRODUCTION
Oct 27, 2021 - 21_0154 Moisture Sensitivity Level Rating Change of LT8331, LTC3637, and LTC7000-1 with #W for MSOP Package
		PCN21_0154_Form Material_Report Delta Qualification Matrix
LTC3637JMSE#WPBF	PRODUCTION
LTC3637JMSE#WTRPBF	PRODUCTION

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

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Protection Switches & Controllers 1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC3637

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

LTC3637 Demo Board | Micropower Buck, 4V ≤ VIN ≤ 76V, VOUT = 1.8V/3.3V/5V/Adjustable @ 1A

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Product Details

Demonstration circuit 2056A is a 76V input, 1A output DC/DC power supply featuring the LTC3637. The IC operates in a high efficiency Burst Mode^® operation and includes an internal high side power MOSFET. The board will accept an input voltage between 4V and 76V, and provide jumper selected output voltages of 1.8V, 3.3V, 5V and an option for additional voltages. The IC includes internal soft-start and a provision for increasing soft-start time.