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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Status Explanations for product status codes

Part Number Status
MAX1781 Active: In Production. See Ordering Information for details.

Description

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.
 

Data Sheet

Request Full Data Sheet

Key Features

  • 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)
 

Applications/Uses

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

Reliability Reports

Reliability Report: MAX1781.pdf
Show FIT data for:

Software/Models

none

Ordering Information

Filters: Part Number: Package: Temperature: Tape and Reel Sample
Part Number Free
Sample		 Buy Status Explanations for product status codes Package:
TYPE PINS FOOTPRINT
DRAWING  CODE/VAR * 		Temp RoHS/Lead-Free?
Materials Analysis
MAX1781ETM     N/A No Longer Available TQFN;48 pin;50.4 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+    
Active: Data sheet on request only TQFN;48 pin;50.4 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+C47    
Active: Data sheet on request only TQFN;48 pin;50.4 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    
Active: Data sheet on request only TQFN;48 pin;50.4 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+C8B    
Active: Data sheet on request only TQFN;48 pin;50.4 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    
Active: Data sheet on request only TQFN;48 pin;50.4 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+TC47    
Active: Data sheet on request only TQFN;48 pin;50.4 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+TGD3    
Active: Data sheet on request only TQFN;48 pin;50.4 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     N/A No Longer Available QFN;48 pin

Land Pattern: Not Available

-40°C to +85°C See data sheet
MAX1781EVKIT     N/A No Longer Available KIT;

Land Pattern: Not Available

See data sheet

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; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product 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.

Similar Products by Function

MAX1782 Advanced Smart Battery-Pack Controller

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New Product Press Release [ 2003-11-05 ]


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

 


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