LTC3811

PRODUCTION

High Speed Dual, Multiphase Step-Down DC/DC Controller

Data Sheet Product Selection Table

Part Models: 4
1ku List Price: Starting From $4.48

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Part Details

Fixed Frequency, Peak Current Mode Control
±0.5% Output Accuracy Over Temperature
Optimized for Low V_OUT Applications (Up to 3.3V)
Dual or Single Output, Multiphase Operation
Wide V_IN Range: 4.5V to 30V Operation
High Speed Differential Remote Sense Amplifier
Inductor DCR or Sense Resistor Capable
Adjustable Peak Current Sense Voltage: 24mV to 85mV
Very Low Duty Cycle Operation: t_ON(MIN) = 65ns (Typ)
Powerful Internal Gate Drivers
Output Voltage Soft-Start, Tracking and Sequencing
Programmable Load Line for Reduced C_OUT
Clock Input and Output for Up to 12-Phase Operation
Fixed Frequency Operation from 250kHz to 750kHz
PLL Synchronization from 150kHz Up to 900kHz
Selectable CCM or DCM Operation
Available in 5mm x 7mm QFN and G36 Packages

Part Models: 4
1ku List Price: Starting From $4.48

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
LTC3811EG#PBF	36-Lead SSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3811EG#TRPBF	36-Lead SSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3811EUHF#PBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3811EUHF#TRPBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Nov 18, 2019 - 19_0266 Laser Top Mark for SSOP36/44/48 Packages assembled in ADPG and UTAC
		PCN19_0266_Form Material_Report Detailed Parts List
LTC3811EG#PBF	PRODUCTION
LTC3811EG#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
Digital Power System Managers 1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Dual-Supply Monitors 1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
Multiple Output Buck Regulators 1
LTC3880	RECOMMENDED FOR NEW DESIGNS	Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit

Tools & Simulations

LTspice 1

LTC3811 - Step-Down (Buck) Regulators

Models for the following parts are available in LTspice:

LTC3811

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

LTC3811EUHF Demo Board | 4.5V < VIN < 14V, VOUT: 2V/15A, 1.5V/15A

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Product Details

Demonstration circuit 971 is a high current density supply featuring the dual-output, 2-phase synchronous buck regulator LTC3811. The input voltage of the demo board is designed from 4.5V to 14V. The outputs are 2V/15A and 1.5V/15A. The output voltages can be programmed with different start-up tracking modes. All the critical power and controller IC circuits on the DC971 board are within a 1.45 × 0.9 drop-in PCB layout space. The outputs can be easily configured to have two separated output voltages or a single high current output voltage with two phases in paralleling.

Resources

DC971A - Demo Manual
180.00K

DC971A - Schematic
53.00K

DC971A - Design File
1.00M

Latest Discussions

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LTC3811

Part Details

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 1

Press Release 1