LTC4311 - Low Voltage I2C/SMBus Accelerator

Features

  • Improves I2C Bus Rise Time Transition
  • Ensures Data Integrity with Multiple Devices on the I2C Bus.
  • Wide Supply Voltage Range: 1.6V to 5.5V
  • Improves Low State Noise Margin
  • Up to 400kHz Operation
  • Auto Detect Low Power Standby Mode
  • Low (<5μA) Supply Current Shutdown
  • Does Not Load Bus When Disabled or Powered Down
  • Strong Slew Limited Pull-up Current
  • ±8kV Human Body Model ESD Ruggedness
  • 2mm x 2mm DFN and SC70 Packages
Designed for Automotive and Transportation Applications
AEC-Q100 generic family data available for specific packages


Typical Application

LTC4311 Typical Application
LTC4311 Typical Application

Description

The LTC4311 is a dual I2C active pull-up designed to enhance data transmission speed and reliability for bus loading conditions well beyond the 400pF I2C specification limit. The LTC4311 operates at supply voltages from 1.6V to 5.5V and is also compatible with SMBus.

The LTC4311 allows multiple device connections or a longer, more capacitive interconnect, without compromising slew rates or bus performance, by using two slew limited pull-up currents.

During positive bus transitions, the LTC4311 provides slew limited pull-up currents to quickly slew the I2C or SMBus lines to the bus pull-up voltage. During negative transitions or steady DC levels, the currents are disabled to improve negative slew rate, and improve low state noise margins. An auto detect standby mode reduces supply current if both SCL and SDA are high. When disabled, the LTC4311 goes into low (<5μA) current shutdown.

The LTC4311 is available in the 2mm x 2mm x 0.75mm DFN, and SC70 packages.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

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

Part Number Package Code Temp Package
Drawing
RoHS
LTC4311CDC#PBF 2x2 DFN-6 DC6 C 05-08-1703 Yes
LTC4311CDC#TRMPBF 2x2 DFN-6 DC6 C 05-08-1703 Yes
LTC4311CDC#TRPBF 2x2 DFN-6 DC6 C 05-08-1703 Yes
LTC4311CSC6#PBF SC-70 SC6 C 05-08-1638 Yes
LTC4311CSC6#TRMPBF SC-70 SC6 C 05-08-1638 Yes
LTC4311CSC6#TRPBF SC-70 SC6 C 05-08-1638 Yes
LTC4311IDC#PBF 2x2 DFN-6 DC6 I 05-08-1703 Yes
LTC4311IDC#TRMPBF 2x2 DFN-6 DC6 I 05-08-1703 Yes
LTC4311IDC#TRPBF 2x2 DFN-6 DC6 I 05-08-1703 Yes
LTC4311ISC6#PBF SC-70 SC6 I 05-08-1638 Yes
LTC4311ISC6#TRMPBF SC-70 SC6 I 05-08-1638 Yes
LTC4311ISC6#TRPBF SC-70 SC6 I 05-08-1638 Yes


LTC4311 Package Drawing
LTC4311 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
LTC4311CDC#PBF 2x2 DFN-6 C $2.21 Yes
LTC4311CDC#TRMPBF 2x2 DFN-6 C $2.21 $1.60 Yes
LTC4311CDC#TRPBF 2x2 DFN-6 C $2.21 $1.55 Yes
LTC4311CSC6#PBF SC-70 C $2.21 Yes
LTC4311CSC6#TRMPBF SC-70 C $2.21 $1.60 Yes
LTC4311CSC6#TRPBF SC-70 C $2.21 $1.55 Yes
LTC4311IDC#PBF 2x2 DFN-6 I $2.66 Yes
LTC4311IDC#TRMPBF 2x2 DFN-6 I $2.66 $1.91 Yes
LTC4311IDC#TRPBF 2x2 DFN-6 I $2.66 $1.86 Yes
LTC4311ISC6#PBF SC-70 I $2.66 Yes
LTC4311ISC6#TRMPBF SC-70 I $2.66 $1.91 Yes
LTC4311ISC6#TRPBF SC-70 I $2.66 $1.86 Yes
Buy NowRequest Samples
* 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.

Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

Please contact your local sales representative for more information regarding reliability reports and AEC-Q100 data or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC4311IDC#PBF 2x2 DFN-6 I $2.66 Yes
LTC4311IDC#TRMPBF 2x2 DFN-6 I $2.66 $1.91 Yes
LTC4311IDC#TRPBF 2x2 DFN-6 I $2.66 $1.86 Yes
LTC4311ISC6#PBF SC-70 I $2.66 Yes
LTC4311ISC6#TRMPBF SC-70 I $2.66 $1.91 Yes
LTC4311ISC6#TRPBF SC-70 I $2.66 $1.86 Yes
Buy NowRequest Samples
* 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.

Applications

  • Notebook and Palmtop Computers
  • Portable Instruments
  • Battery Chargers
  • Industrial Controls
  • TV/Video Products
  • ACPI SMBus Interface

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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
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  • 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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