LT3840

RECOMMENDED FOR NEW DESIGNS

Wide Input Range Synchronous Regulator Controller with Accurate Current Limit

Data Sheet (Rev. B) Product Selection Table

Part Models: 12
1ku List Price: Starting From $4.37

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Part Details

Wide Input Range: 2.5V to 60V
Integrated Buck-Boost Supply for 7.5V MOSFET Gate Drive
Programmable Constant-Current Operation with Current Monitor Output
Low I_Q: 75μA, 12V_IN to 3.3V_OUT
Selectable Low Output Ripple Burst Mode^® Operation
V_OUT Up to 60V
Adjustable and Synchronizable: 50kHz to 1MHz
Internal OVLO Protects for Input Transients Up to 80V
Accurate Input Overvoltage and Undervoltage Threshold
Programmable Soft-Start with Voltage Tracking
Power Good and Output OVP
28-Lead TSSOP and 38-Lead 4mm × 6mm QFN Packages

Part Models: 12
1ku List Price: Starting From $4.37

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
LT3840EFE#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3840EFE#TRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3840EUFE#PBF	38-Lead QFN (4mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3840EUFE#TRPBF	38-Lead QFN (4mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3840HFE#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3840HFE#TRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3840IFE#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3840IFE#TRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3840IUFE#PBF	38-Lead QFN (4mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3840IUFE#TRPBF	38-Lead QFN (4mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3840MPFE#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3840MPFE#TRPBF	28-Lead TSSOP 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
LT3840EFE#PBF	PRODUCTION
LT3840EFE#TRPBF	PRODUCTION
LT3840EUFE#PBF	PRODUCTION
LT3840EUFE#TRPBF	PRODUCTION
LT3840HFE#PBF	PRODUCTION
LT3840HFE#TRPBF	PRODUCTION
LT3840IFE#PBF	PRODUCTION
LT3840IFE#TRPBF	PRODUCTION
LT3840IUFE#PBF	PRODUCTION
LT3840IUFE#TRPBF	PRODUCTION
Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL
		PCN22_0068_Form Material_Report Delta Qualification Matrix
LT3840EFE#PBF	PRODUCTION
LT3840EFE#TRPBF	PRODUCTION
LT3840HFE#PBF	PRODUCTION
LT3840HFE#TRPBF	PRODUCTION
LT3840IFE#PBF	PRODUCTION
LT3840IFE#TRPBF	PRODUCTION
LT3840MPFE#PBF	PRODUCTION
LT3840MPFE#TRPBF	PRODUCTION

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

Hardware Ecosystem

Parts	Product Life Cycle	Description
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:

LT3840

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

LT3840EFE Demo Board | 4.5V ≤ VIN ≤ 60V, 80V Transients, VOUT = 3.3V @ 20A

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Product Details

Demonstration circuit 1909A is a 150kHz, 60V current mode DC/DC step-down converter with accurate current limit featuring the LT3840. The circuit operates from a V_IN range of 4.5V to 60V, survives an 80V transient, and outputs 3.3V at 20A (66W). An integrated buck-boost switching regulator generates a 7.5V bias supply voltage for MOSFET gate drive and IC power to increase the overall efficiency by reducing the power loss. A soft-start feature controls the output voltage slew rate at start-up, reducing current surges and voltage overshoots. The modes of operation (Burst Mode^®, discontinuous current mode and continuous current mode) are jumper selectable.