LTC3864

PRODUCTION

60V Low I_Q Step-Down DC/DC Controller with 100% Duty Cycle Capability

Data Sheet (Rev. C) Product Selection Table

Part Models: 20
1ku List Price: Starting From $2.49

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Overview

Wide Operating V_IN Range: 3.5V to 60V
Wide V_OUT Range: 0.8V to V_IN
Low Operating I_Q = 40μA
Very Low Dropout Operation: 100% Duty Cycle
Strong High Voltage MOSFET Gate Driver
Constant Frequency Current Mode Architecture
Verified FMEA for Adjacent Pin Open/Short
Selectable High Efficiency Burst Mode^® Operation or Pulse-Skipping Mode at Light Loads
Programmable Fixed Frequency: 50kHz to 850kHz

Phase-Lockable Frequency: 75kHz to 750kHz
Accurate Current Limit
Programmable Soft-Start or Voltage Tracking
Internal Soft-Start Guarantees Smooth Start-Up
Power Good Output Voltage Monitor
Low Shutdown I_Q = 7μA
Available in Small 12-Pin Thermally Enhanced MSOP and DFN Packages
AEC-Q100 Qualified for Automotive Applications

The LTC3864 is a robust, high voltage step-down DC/DC controller optimized for automotive and industrial applications. It drives a P-channel power MOSFET switch allowing 100% duty cycle operation. The wide input and output voltage ranges cover a multitude of applications. This device has been verified with the failure mode and effects analysis (FMEA) procedure for operation during failure conditions.

The LTC3864 offers excellent light load efficiency, drawing only 40μA quiescent current in a user programmable Burst Mode operation. Its peak current mode, constant frequency PWM architecture provides for good control of switching frequency and output current limit. The switching frequency can be programmed from 50kHz to 850kHz with an external resistor and can be synchronized to an external clock from 75kHz to 750kHz.

The LTC3864 offers programmable soft-start or output tracking. Safety features include overvoltage protection, overcurrent and short-circuit protection including frequency foldback and a power good output signal.

The LTC3864 is available in thermally enhanced 12-Pin MSOP and 3mm × 4mm DFN packages.

APPLICATIONS

Industrial and Automotive Power Supplies
Telecom Power Supplies
Distributed Power Systems

Part Models: 20
1ku List Price: Starting From $2.49

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
LTC3864EDE#PBF	12-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3864EDE#TRPBF	12-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3864EMSE#PBF	12-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3864EMSE#TRPBF	12-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3864HDE#PBF	12-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3864HDE#TRPBF	12-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3864HMSE#PBF	12-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3864HMSE#TRPBF	12-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3864HMSE#WPBF	12-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3864HMSE#WTRPBF	12-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3864IDE#PBF	12-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3864IDE#TRPBF	12-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3864IMSE#PBF	12-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3864IMSE#TRPBF	12-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3864IMSE#WPBF	12-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3864IMSE#WTRPBF	12-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3864MPDE#PBF	12-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3864MPDE#TRPBF	12-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3864MPMSE#PBF	12-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3864MPMSE#TRPBF	12-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jun 6, 2025 - 25_0119 Bond Wire Change from Gold to Copper
		PCN25_0119_Form Material_Report Delta Qualification Matrix Qualification Results Summary
LTC3864EMSE#PBF	PRODUCTION
LTC3864EMSE#TRPBF	PRODUCTION
LTC3864HMSE#PBF	PRODUCTION
LTC3864HMSE#TRPBF	PRODUCTION
LTC3864HMSE#WPBF	PRODUCTION
LTC3864HMSE#WTRPBF	PRODUCTION
LTC3864IMSE#WPBF	PRODUCTION
LTC3864IMSE#WTRPBF	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
LTC3864EMSE#PBF	PRODUCTION
LTC3864EMSE#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
LTC3864EMSE#PBF	PRODUCTION
LTC3864EMSE#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
LTC3864EMSE#PBF	PRODUCTION
LTC3864EMSE#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
LTC3864EMSE#PBF	PRODUCTION
LTC3864EMSE#TRPBF	PRODUCTION
LTC3864HMSE#PBF	PRODUCTION
LTC3864HMSE#TRPBF	PRODUCTION
LTC3864IMSE#PBF	PRODUCTION
LTC3864IMSE#TRPBF	PRODUCTION
LTC3864MPMSE#PBF	PRODUCTION
LTC3864MPMSE#TRPBF	PRODUCTION
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
LTC3864HDE#PBF	PRODUCTION
LTC3864HDE#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
LTC3864HMSE#PBF	PRODUCTION
LTC3864HMSE#TRPBF	PRODUCTION
LTC3864IMSE#PBF	PRODUCTION
LTC3864IMSE#TRPBF	PRODUCTION
LTC3864MPMSE#PBF	PRODUCTION
LTC3864MPMSE#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
Circuit Monitors 1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
Power System Management (PSM) & Sequencers 1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Protection Switches & Controllers 1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit

Tools & Simulations

LTspice 3

Models for the following parts are available in LTspice:

LTC3864

LTpowerCAD 3

Design tools for the following parts are available in LTpowerCAD:

LTC3864

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.

LTpowerCAD^® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

Evaluation Kits

LTC3864 Demo Board | Buck Controller, 12V ≤ VIN ≤ 60V, VOUT = 12V @ 5A

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Product Details

Demonstration circuit 2434A is a high voltage, current mode DC/DC step-down converter featuring the LTC3864.

The board operates from an input range of 6V to 60V and provides a 12V, 5A output when the input exceeds 12V. The PMOSFET architecture allows it to operate seamlessly up to 100% duty cycle and function as a saturated switch below the regulation threshold, down to 6V_IN. It operates at 200kHz and may be synchronized to an external clock. A soft-start feature controls output voltage slew rate at start-up, reducing current surge and voltage overshoot. Burst Mode^® operation that improves efficiency at light loads can be enabled with a jumper. A power good output signal is provided.