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MAX1781
Advanced Smart Battery-Pack Controller

Advanced Smart Battery-Pack Controller Integrates a User-Programmable Microcontroller Core, a Coulomb-Counting Fuel Gauge, a Multichannel Data-Acquisition Unit, and an SMBus™ V1.1-Compliant Master/Slave SMBus Interface


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Description
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The MAX1781 smart battery-pack controller integrates a user-programmable microcontroller core, a coulomb-counting fuel gauge, a multi-channel data-acquisition unit, and an SMBus v1.1 compliant master/slave SMBus interface. The 8-bit, RISC microcontroller core has an integrated 12k bytes of user programmable EEPROM, which provides battery-pack designers with complete flexibility in developing fuel gauging and control algorithms. The MAX1781 is equipped with full ICE (in-circuit emulator) capability for efficient firmware development and debugging.

The 16-bit data-acquisition unit measures individual cell voltages, cell stack voltage, chip internal/external temperature, and two general purpose analog inputs. Individual cell voltage measurements with 0.5% accuracy and over-current protection allow the MAX1781 to eliminate a separate 1st level protection IC. Adjustable over-current thresholds and delay timers provide a flexible solution.

The integrating fuel gauge module provides a typical input offset of less than 1µV, and gain accuracy of better than 1% with no trimming required during pack manufacture. The MAX1781 has a wide 4V to 28V operating voltage range. The IC is available in a 7mm x 7mm 48-TQFN package with a maximum thickness of 0.8mm.

Key Features   Applications/Uses
  • Accurate Fuel Gauge Uses V to F Method
    • < 1µV Input Offset Voltage
    • < 1% Gain Accuracy
    • No Calibration Required
  • 8-bit RISC Microcontroller Core
  • 12k Bytes of Program/Data EEPROM
  • 64 Bytes of Byte Writeable EEPROM
  • 264 Bytes of RAM
  • Watchdog Timer
  • ICE for Firmware Debugging
  • Integrated Development Environment (IDE)
    • C Compiler
    • Inline Assembler
  • Eliminates Separate Primary-Protection IC
    • Individual Cell Voltage Measurements with 0.5% accuracy
    • Built-In Protection MOSFET Gate Drivers
    • 8% Accurate Overcurrent Protection
    • Programmable Over-Current Delay Timers
  • SMBus v1.1-Compliant, with Master Capability
  • Typical Operating Current < 120µA
  • Typical Shutdown Current < 10nA
  • Integrated 32kHz Oscillator: No Crystal
  • Fully Integrated LDO (VIN = 4V to 28V)

 
  • Data Acquisition Systems
  • Notebook Battery Packs
  • Proprietary Battery Packs
  • Remote Data Logging

    Evaluation Kits
    none

    Design Guides
  • Low-Power Notebook ICs (PDF)
  • Battery Management (PDF)
  • Power Management for Battery-Powered Equipment (PDF)

    Reliability Reports
  • Show FIT data for:
  • Request Reliability Report for:

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-7 of 7

    MAX1781 Free
    Sample
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    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1781EVKIT    


    Land Pattern: Not Available

    See data sheet
    MAX1781ETM+C8B  
    TQFN;48 pin;50 mm²
    Outline Drawing: 21-0144 (PDF)
    Land Pattern: 90-0132 (PDF)
    Use pkgcode/variation: T4877+6*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1781ETM+C6D  
    TQFN;48 pin;50 mm²
    Outline Drawing: 21-0144 (PDF)
    Land Pattern: 90-0132 (PDF)
    Use pkgcode/variation: T4877+6*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1781ETM  
    TQFN;48 pin;50 mm²
    Outline Drawing: 21-0144 (PDF)
    Land Pattern: 90-0132 (PDF)
    Use pkgcode/variation: T4877-6*
    -40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1781ETM-T  
    TQFN;48 pin;50 mm²
    Outline Drawing: 21-0144 (PDF)
    Land Pattern: 90-0132 (PDF)
    Use pkgcode/variation: T4877-6*
    -40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1781ETM+  
    TQFN;48 pin;50 mm²
    Outline Drawing: 21-0144 (PDF)
    Land Pattern: 90-0132 (PDF)
    Use pkgcode/variation: T4877+6*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1781ETM+T  
    TQFN;48 pin;50 mm²
    Outline Drawing: 21-0144 (PDF)
    Land Pattern: 90-0132 (PDF)
    Use pkgcode/variation: T4877+6*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  • New Product Press Release 2003-11-05 

    Related Products
    MAX1782 Advanced Smart Battery-Pack Controller

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    Document Ref.: xxxx; Rev 0; 2004-03-16
    This page last modified: 2009-03-26


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