LTC3631

PRODUCTION

High Efficiency, High Voltage 100mA Synchronous Step-Down Converter

Data Sheet Product Selection Table

Part Models: 24
1ku List Price: Starting From $3.54

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Part Details

Wide Input Voltage Range: Operation from 4.5V to 45V
Overvoltage Lockout Provides Protection Up to 60V
Internal High Side and Low Side Power Switches
No Compensation Required
100mA Output Current
Low Dropout Operation: 100% Duty Cycle
Low Quiescent Current: 12μA
0.8V ±1% Feedback Voltage Reference
Adjustable Peak Current Limit
Internal and External Soft-Start
Precise RUN Pin Threshold with Adjustable Hysteresis
3.3V, 5V and Adjustable Output Versions
Only Three External Components Required for Fixed Output Versions
Low Profile (0.75mm) 3mm × 3mm DFN and Thermally-Enhanced MS8E Packages

Part Models: 24
1ku List Price: Starting From $3.54

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
LTC3631EDD#PBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3631EDD#TRPBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3631EDD-3.3#PBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3631EDD-3.3#TRPBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3631EDD-5#PBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3631EDD-5#TRPBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3631EMS8E#PBF	8-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3631EMS8E#TRPBF	8-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3631EMS8E-3.3#PBF	8-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3631EMS8E-3.3#TRPBF	8-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3631EMS8E-5#PBF	8-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3631EMS8E-5#TRPBF	8-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3631IDD#PBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3631IDD#TRPBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3631IDD-3.3#PBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3631IDD-3.3#TRPBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3631IDD-5#PBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3631IDD-5#TRPBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3631IMS8E#PBF	8-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3631IMS8E#TRPBF	8-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3631IMS8E-3.3#PBF	8-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3631IMS8E-3.3#TRPBF	8-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3631IMS8E-5#PBF	8-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3631IMS8E-5#TRPBF	8-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper
		PCN25_0017_Form Material_Report Qualification Results Summary
LTC3631EDD#PBF	PRODUCTION
LTC3631EDD#TRPBF	PRODUCTION
LTC3631EDD-3.3#PBF	PRODUCTION
LTC3631EDD-3.3#TRPBF	PRODUCTION
LTC3631EDD-5#PBF	PRODUCTION
LTC3631EDD-5#TRPBF	PRODUCTION
LTC3631IDD#PBF	PRODUCTION
LTC3631IDD#TRPBF	PRODUCTION
LTC3631IDD-3.3#PBF	PRODUCTION
LTC3631IDD-3.3#TRPBF	PRODUCTION
LTC3631IDD-5#PBF	PRODUCTION
LTC3631IDD-5#TRPBF	PRODUCTION
Jul 28, 2021 - 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
LTC3631EDD#PBF	PRODUCTION
LTC3631EDD#TRPBF	PRODUCTION
LTC3631EDD-3.3#PBF	PRODUCTION
LTC3631EDD-3.3#TRPBF	PRODUCTION
LTC3631EMS8E#PBF	PRODUCTION
LTC3631EMS8E#TRPBF	PRODUCTION
LTC3631EMS8E-3.3#PBF	PRODUCTION
LTC3631EMS8E-3.3#TRPBF	PRODUCTION
LTC3631IDD#PBF	PRODUCTION
LTC3631IDD#TRPBF	PRODUCTION
LTC3631IDD-3.3#PBF	PRODUCTION
LTC3631IDD-3.3#TRPBF	PRODUCTION
LTC3631IMS8E#PBF	PRODUCTION
LTC3631IMS8E#TRPBF	PRODUCTION
LTC3631IMS8E-3.3#PBF	PRODUCTION
LTC3631IMS8E-3.3#TRPBF	PRODUCTION
Nov 8, 2021 - 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
LTC3631EDD-5#PBF	PRODUCTION
LTC3631EDD-5#TRPBF	PRODUCTION
LTC3631EMS8E-5#PBF	PRODUCTION
LTC3631EMS8E-5#TRPBF	PRODUCTION
LTC3631IDD-5#PBF	PRODUCTION
LTC3631IDD-5#TRPBF	PRODUCTION
LTC3631IMS8E-5#PBF	PRODUCTION
LTC3631IMS8E-5#TRPBF	PRODUCTION
Feb 3, 2020 - 20_0128 Laser Top Mark for 8 Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0128_Form Material_Report
LTC3631EMS8E#PBF	PRODUCTION
LTC3631EMS8E#TRPBF	PRODUCTION
LTC3631EMS8E-3.3#PBF	PRODUCTION
LTC3631EMS8E-3.3#TRPBF	PRODUCTION
LTC3631EMS8E-5#PBF	PRODUCTION
LTC3631EMS8E-5#TRPBF	PRODUCTION
LTC3631IMS8E#PBF	PRODUCTION
LTC3631IMS8E#TRPBF	PRODUCTION
LTC3631IMS8E-3.3#PBF	PRODUCTION
LTC3631IMS8E-3.3#TRPBF	PRODUCTION
LTC3631IMS8E-5#PBF	PRODUCTION
LTC3631IMS8E-5#TRPBF	PRODUCTION

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

Hardware Ecosystem

Parts	Product Life Cycle	Description
Digital Temperature Sensors 1
LTC2991	RECOMMENDED FOR NEW DESIGNS	Octal I²C Voltage, Current, and Temperature Monitor
Dual-Supply Monitors 1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
PowerPath, Ideal Diodes, and Load Switches 1
LTC4359	RECOMMENDED FOR NEW DESIGNS	Ideal Diode Controller with Reverse Input Protection
TimerBlox 1
LTC6991	PRODUCTION	TimerBlox: Resettable, Low Frequency Oscillator

Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

LTC3631
LTC3631-3.3
LTC3631-5

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

LTC3631EDD Demo Board | 60V Transients, 4.5V ≤ VIN ≤ 45V, VOUT = 1.8V/3.3V/5V @ 100mA

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Product Details

Demonstration circuit DC1499A is a high efficiency step-down DC/DC converter featuring LTC3631 with internal high side and synchronous power switches that draws only 12μA quiescent current. It has a wide 4.5V to 45V input range and internal over voltage monitor capable of protecting the part through 60V surges. The jumper selectable output is up to 5V. LTC3631 can supply up to 100mA load current with a programmable peak current limit that provides a simple method for optimizing efficiency in lower current applications. With no compensation required, LTC3631 is easily configured with minimal components.

Resources

DC1499A - Design File
2.00M

DC1499A - Schematic
82.00K

DC1499A - Demo Manual
439.00K

Latest Discussions

5 Years Ago

Part Details

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 1