LT3645

PRODUCTION

36V 500mA Step-Down Regulator and 200mA LDO

Data Sheet Product Selection Table

Part Models: 10
1ku List Price: Starting From $2.72

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Part Details

Wide Input Range:

Operation from 3.6V to 36V
Overvoltage Lockout Protects Circuit Through 55V Transients on Input

500mA Output Current Switching Regulator
High Switching Frequency: 750kHz
200mA Low Dropout Linear Regulator

1.2V to 16V Input; 0.8V to 8V Output
310mV Dropout Voltage V_CC2 to OUT2

Precision Programmable Undervoltage Lockout
Short-Circuit Robust
Internal Soft-Start
<2μA Shutdown Current
Small Thermally Enhanced 16-Lead (3mm × 3mm) QFN and 12-Lead MSE Packages

Part Models: 10
1ku List Price: Starting From $2.72

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
LT3645EMSE#PBF	12-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3645EMSE#TRPBF	12-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3645EUD#PBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3645EUD#TRPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3645HMSE#PBF	12-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3645HMSE#TRPBF	12-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3645IMSE#PBF	12-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3645IMSE#TRPBF	12-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3645IUD#PBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3645IUD#TRPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 14, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only)
		PCN25_0016_Form Material_Report Qualification Results Summary
LT3645EMSE#PBF	PRODUCTION
LT3645EMSE#TRPBF	PRODUCTION
LT3645EUD#PBF	PRODUCTION
LT3645EUD#TRPBF	PRODUCTION
LT3645HMSE#PBF	PRODUCTION
LT3645HMSE#TRPBF	PRODUCTION
LT3645IMSE#PBF	PRODUCTION
LT3645IMSE#TRPBF	PRODUCTION
LT3645IUD#PBF	PRODUCTION
LT3645IUD#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
LT3645EMSE#PBF	PRODUCTION
LT3645EMSE#TRPBF	PRODUCTION
LT3645HMSE#PBF	PRODUCTION
LT3645HMSE#TRPBF	PRODUCTION
LT3645IMSE#PBF	PRODUCTION
LT3645IMSE#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
LT3645EMSE#PBF	PRODUCTION
LT3645EMSE#TRPBF	PRODUCTION
LT3645HMSE#PBF	PRODUCTION
LT3645HMSE#TRPBF	PRODUCTION
LT3645IMSE#PBF	PRODUCTION
LT3645IMSE#TRPBF	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
PowerPath, Ideal Diodes, and Load Switches 1
LTC4359	RECOMMENDED FOR NEW DESIGNS	Ideal Diode Controller with Reverse Input Protection
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:

LT3645

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

LT3645EMSE Demo Board | VIN = 5V to 36V, VOUT1 = 3.3V @ 300mA, VOUT2= 2.5V @ 200mA

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Product Details

Demonstration circuit 1428A features the dual output LT3645 step-down regulator plus linear regulator. The circuit is designed to convert a 5V to 36V (55V transients) input source to 3.3V at 500mA using the buck regulator and this output is linear regulated down to provide 2.5V at 200mA. Thus the two outputs provide 300mA (buck) and 200mA (LDO).

Resources

DC1428A - Schematic
37.00K

DC1428A - Demo Manual
153.00K

DC1428A - Design Files
623.00K

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