LT8711 - Micropower Synchronous Multitopology Controller with 42V Input Capability

Features

  • Easily Configurable as a Synchronous Buck, Boost, SEPIC, ZETA or Nonsynchronous Buck-Boost Converter
  • Wide Input Range: 4.5V to 42V (VIN Can Operate to 0V, when EXTVCC > 4.5V)
  • Automatic Low Noise Burst Mode® Operation
  • Low IQ 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

Typical Application

LT8711 Typical Application
LT8711 Typical Application

Description

The LT®8711 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.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LT8711EFE#PBF TSSOP-20 FE E 05-08-1663 (CB) Yes
LT8711EFE#TRPBF TSSOP-20 FE E 05-08-1663 (CB) Yes
LT8711EUDC#PBF 3x4 QFN-20 UDC E 05-08-1742 Yes
LT8711EUDC#TRPBF 3x4 QFN-20 UDC E 05-08-1742 Yes
LT8711IFE#PBF TSSOP-20 FE I 05-08-1663 (CB) Yes
LT8711IFE#TRPBF TSSOP-20 FE I 05-08-1663 (CB) Yes
LT8711IUDC#PBF 3x4 QFN-20 UDC I 05-08-1742 Yes
LT8711IUDC#TRPBF 3x4 QFN-20 UDC I 05-08-1742 Yes


LT8711 Package Drawing
LT8711 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT8711EFE#PBF TSSOP-20 E $3.57 $2.50 Yes
LT8711EFE#TRPBF TSSOP-20 E $3.63 $2.56 Yes
LT8711EUDC#PBF 3x4 QFN-20 E $3.29 $2.30 Yes
LT8711EUDC#TRPBF 3x4 QFN-20 E $3.35 $2.36 Yes
LT8711IFE#PBF TSSOP-20 I $3.93 $2.75 Yes
LT8711IFE#TRPBF TSSOP-20 I $3.99 $2.81 Yes
LT8711IUDC#PBF 3x4 QFN-20 I $3.57 $2.50 Yes
LT8711IUDC#TRPBF 3x4 QFN-20 I $3.63 $2.56 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC2234A LT8711 Micropower Synchronous Sepic Converter Contact Factory
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Click here to view our complete list of demo boards

Applications

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

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Design Tools

Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:

  • LTspice - A powerful SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators
  • LTpowerCAD - A complete power supply selection, synthesis and design tool
  • LTpowerPlay - A development environment supporting Linear Technology's Digital Power System Management (PSM) products
  • PScope & QuikEval - USB-based product demonstration and data acquisition system for use with our ADCs, DACs, and more
  • Linduino - Arduino compatible system for developing and distributing firmware libraries and example code
  • LinearLab Tools - A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards
  • And More!

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