LTC1760 - Dual Smart Battery System Manager

Features

  • SMBus Charger/Selector for Two Smart Batteries*
  • Voltage and Current Accuracy within 0.2% of Value Reported by Battery
  • Simplifies Construction of “Smart Battery System Manager”
  • Includes All SMBus Charger V1.1 Safety Features
  • Supports Autonomous Operation without a Host
  • Allows Both Batteries to Discharge Simultaneously into Single Load with Low Loss (Ideal Diode)
  • SMBus Switching for Dual Batteries with Alarm Monitoring for Charging Battery at All Times
  • Pin Programmable Limits for Maximum Charge Current and Voltage Improve Safety
  • Fast Autonomous Power Path Switching (<10µs)
  • Low Loss Simultaneous Charging of Two Batteries
  • >95% Efficient Synchronous Buck Charger
  • AC Adapter Current Limiting* Maximizes Charge Rate
  • SMBus Accelerator Improves SMBus Timing**
  • Available in 48-Lead TSSOP Package

Typical Application

LTC1760 Typical Application
LTC1760 Typical Application

Description

The LTC®1760 Smart Battery System Manager is a highlyintegrated SMBus Level 3 battery charger and selector intended for products using dual smart batteries. Three SMBus interfaces allow the LTC1760 to servo to the internal voltage and currents measured by the batteries while allowing an SMBus Host device to monitor either battery’s status. Charging accuracy is determined by the battery’s internal voltage and current measurements, typically better than ±0.2%.

A proprietary PowerPath architecture supports simultaneous charging or discharging of both batteries. Typical battery run times are extended by up to 10%, while charging times are reduced by up to 50%. The LTC1760 automatically switches between power sources in less than 10μs to prevent power interruption upon battery or wall adapter removal.

The LTC1760 implements all elements of a version 1.1 “Smart Battery System Manager” except for the generation of composite battery information. An internal multiplexer cleanly switches the SMBus Host to either of the two attached Smart Batteries without generating partial messages to batteries or SMBus Host. Thermistors on both batteries are automatically monitored for temperature and disconnection information (SafetySignal).

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
LTC1760CFW#PBF TSSOP-48 FW C 05-08-1651 Yes
LTC1760CFW#TRPBF TSSOP-48 FW C 05-08-1651 Yes
LTC1760IFW#PBF TSSOP-48 FW I 05-08-1651 Yes
LTC1760IFW#TRPBF TSSOP-48 FW I 05-08-1651 Yes


LTC1760 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
LTC1760CFW#PBF TSSOP-48 C $11.36 $7.95 Yes
LTC1760CFW#TRPBF TSSOP-48 C $8.07 Yes
LTC1760IFW#PBF TSSOP-48 I $13.07 $9.15 Yes
LTC1760IFW#TRPBF TSSOP-48 I $9.21 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
DC486B LTC1760CFW Demo Board | Dual Li Ion Smart Battery Charger, VIN=12V to 20V, Charge Current = 4A Max $150.00
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Companion Boards

Part Number Description Price Documentation
DC1223A-B USB to SM-Bus/SPI Interface with Monitor $400.00
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Click here to view our complete list of demo boards

Applications

  • Portable Computers and Instruments
  • Standalone Dual Smart Battery Chargers
  • Battery Backup Systems

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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!

Technical Support