LT3505

PRODUCTION

1.2A, Step-Down Switching Regulator in 3mm × 3mm DFN

Data Sheet Product Selection Table

Part Models: 8
1ku List Price: Starting From $2.90

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Part Details

Wide Input Range: 3.6V to 36V Operating, 40V Maximum
Up to 1.2A Output Current
Resistor-Programmable Fixed-Frequency Operation from 200kHz to 3MHz
Output Adjustable Down to 780mV
Short-Circuit Robust
Uses Tiny Capacitors and Inductors
Soft-Start
Low Shutdown Current: <2µA
Low V_CESAT Switch: 350mV at 1A
Thermally Enhanced, Low Profile 3mm x 3mm DFN-8 and MSOP-8 Packages

Part Models: 8
1ku List Price: Starting From $2.90

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
LT3505EDD#PBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3505EDD#TRPBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3505EMS8E#PBF	8-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3505EMS8E#TRPBF	8-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3505IDD#PBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3505IDD#TRPBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3505IMS8E#PBF	8-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3505IMS8E#TRPBF	8-Lead MSOP w/ EP	Material Declaration Reliablity Data	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
LT3505EDD#PBF	PRODUCTION
LT3505EDD#TRPBF	PRODUCTION
LT3505IDD#PBF	PRODUCTION
LT3505IDD#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
LT3505EMS8E#PBF	PRODUCTION
LT3505EMS8E#TRPBF	PRODUCTION
Jul 12, 2022 - 22_0157 UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages [With Modification in BOM]
		PCN22_0157_Form Material_Report Qualification Results Summary Delta Qualification Matrix Detailed Parts List
LT3505EMS8E#PBF	PRODUCTION
LT3505EMS8E#TRPBF	PRODUCTION
Jun 21, 2022 - 22_0050 UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices
		PCN22_0050_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LT3505EMS8E#PBF	PRODUCTION
LT3505EMS8E#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
LT3505EMS8E#PBF	PRODUCTION
LT3505EMS8E#TRPBF	PRODUCTION
LT3505IMS8E#PBF	PRODUCTION
LT3505IMS8E#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
LT3505IMS8E#PBF	PRODUCTION
LT3505IMS8E#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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Surge Stopper, Overvoltage, and Overcurrent Protection 1
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Tools & Simulations

LTspice 1

LT3505 Demo Circuit - 1.2A Step-down Regulator (12V to 5V @ 1.2A)

Models for the following parts are available in LTspice:

LT3505

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

LT3505 HV Buck Regulator Board with Plug-in Interface

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Product Details

DC1395A: Demo Board for LT3505 1.2A, Step-Down Switching Regulator in 3mm × 3mm DFN

Resources

DC1395A - Demo Manual
9/24/2009

DC1395A - Design File
9/24/2009

DC1395A - Schematic
9/24/2009

LT3505EDD Demo Board | 6V ≤ VIN ≤ 36V, VOUT = 5V @ 1A

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Product Details

Demo circuit DC1023A is a monolithic step-down DC/DC switching regulator featuring the LT3505. The demo circuit is designed for a 5V/1A output from a 6V to 36V input.

Resources

DC1023A - Demo Manual
9/24/2009

DC1023A - Design File
9/24/2009

DC1023A - Schematic
9/24/2009

Latest Discussions

2 Years Ago

Part Details

Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Technical Articles 1

Software Resources

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Hardware Ecosystem

Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

Evaluation Kits

Product Details

Resources

Product Details

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