LT8711

RECOMMENDED FOR NEW DESIGNS

Micropower Synchronous Multitopology Controller with 42V Input Capability

Data Sheet (Rev. A) Product Selection Table

Part Models: 8
1ku List Price: Starting From $2.78

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Overview

Easily Configurable as a Synchronous Buck, Boost, SEPIC, ZETA or Nonsynchronous Buck-Boost Converter
Wide Input Range: 4.5V to 42V (V_IN Can Operate to 0V, when EXTV_CC > 4.5V)
Automatic Low Noise Burst Mode^® Operation
Low I_Q in Burst Mode Operation (15μA Operating)
Input Voltage Regulation for High Impedance Source
100% Duty Cycle in Dropout (Buck Mode)
2A Gate Drivers (BG and TG) n Adjustable Soft-Start with One Capacitor
Frequency Programmable from 100kHz to 750kHz
Can Be Synchronized to External Clock
Available in 20-Lead TSSOP and 20-Lead 3mm×4mm QFN Packages

The LT8711 is a multi-topology current mode PWM controller that can easily be configured as a synchronous buck, boost, SEPIC, ZETA or as a nonsynchronous buck-boost converter. Its dual gate drive voltage inputs optimize gate driver efficiency.

The 15µA no-load quiescent current with the output voltage in regulation extends operating run-time in battery powered systems. Low ripple Burst Mode operation enables high efficiency at very light loads while maintaining low output voltage ripple. The LT8711's fixed switching frequency can be set from 100kHz to 750kHz or can be synchronized to an external clock.

The additional features include 100% duty cycle capability when in buck mode, a topology selection pin and adjustable soft-start. LT8711 is available in the 20-lead TSSOP and 20-lead 3mm × 4mm QFN packages.

Applications

General Purpose DC/DC Conversion
Automotive Systems
Industrial Supplies
Solar Panel Power Converter

Part Models: 8
1ku List Price: Starting From $2.78

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
LT8711EFE#PBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT8711EFE#TRPBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT8711EUDC#PBF	20-Lead QFN (3mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT8711EUDC#TRPBF	20-Lead QFN (3mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT8711IFE#PBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT8711IFE#TRPBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT8711IUDC#PBF	20-Lead QFN (3mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT8711IUDC#TRPBF	20-Lead QFN (3mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

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
LT8711EFE#PBF	PRODUCTION
LT8711EFE#TRPBF	PRODUCTION
LT8711IFE#PBF	PRODUCTION
LT8711IFE#TRPBF	PRODUCTION
Apr 11, 2019 - 19_0067 Notification of Wafer Fab Location Change for 0.35 BCD Process
		PCN19_0067_Form Material_Report Delta Qualification Matrix Qualification Results Summary Detailed Parts List Other
LT8711EFE#PBF	PRODUCTION
LT8711EFE#TRPBF	PRODUCTION
LT8711EUDC#PBF	PRODUCTION
LT8711EUDC#TRPBF	PRODUCTION
LT8711IFE#PBF	PRODUCTION
LT8711IFE#TRPBF	PRODUCTION
LT8711IUDC#PBF	PRODUCTION
LT8711IUDC#TRPBF	PRODUCTION

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

Software Resources

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Tools & Simulations

LTspice 1

LT8711 Demo Circuit - Automotive Micropower Synchronous Sepic Converter (4.5-40V to 12V @ 4A)

Models for the following parts are available in LTspice:

LT8711

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

LT8711 Micropower Synchronous Sepic Converter

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Product Details

Demonstration circuit 2234A is a synchronous sepic converter featuring the LT8711 multitopology switching controller. The LT8711 is a current mode PWM DC/DC controller with a dual input LDO to optimize gate driver efficiency. Ultralow 15μA quiescent current in low noise Burst Mode^® operation achieves high efficiency at very light loads and helps extend the run-time in battery powered applications when in standby mode. The LT8711 switching frequency can be programmed either via oscillator resistor or external clock over a 100kHz to 750kHz range.

Resources

DC2234A - Schematics
10/2/2017

DC2234A - Design Files
10/2/2017

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