Overview

The ISL9211B is an integrated circuit (IC) optimized to provide a redundant safety protection to a Li-ion battery charging system. The IC monitors input voltage, battery voltage, and charge current. When any of these parameters exceeds its limit, the IC turns off an internal N-channel MOSFET to remove power from the charging system to the battery. The IC also monitors its own internal temperature and turns off the N-channel MOSFET when the temperature exceeds +150°C. Together with the battery charger IC and the protection module in a battery pack, the charging system using the ISL9211B has triple-level protection and is two-fault tolerant. The IC is designed to turn on the internal NFET slowly, to avoid in-rush current at power-up. It turns off the NFET quickly when the input is overvoltage, to remove power before damage occurs. The ISL9211B has a logic flag output to indicate a fault condition. The enable input allows the system to cut off the input power, if needed.

ISL9211B Functional Diagram
ISL9211B Functional Diagram
  • 24V Max Input Voltage
  • Supports Up To 2.0A Input Current
  • Fully Integrated Protection Circuit for Three Protected Variables
  • High Accuracy Protection Thresholds
  • User Programmable Overcurrent Protection Threshold
  • Responds to Input Overvoltage in Less Than 1µs
  • High Immunity of False Triggering Under Transients
  • Fault Indication for Various Fault Occurrence
  • Easy to Use
  • Pb-Free (RoHS Compliant)

Applications

  • Cell Phones
  • Digital Still Cameras
  • PDAs and Smart Phones
  • Portable Instruments
  • Desktop Chargers

Documentation

= Featured Documentation
Type Title Date
Datasheet
ISL9211B Datasheet
PDF 639 KB
Other
TB389: PCB Land Pattern Design and Surface Mount Guidelines for QFN Packages
PDF 1.17 MB
Other
TB363: Guidelines for Handling and Processing Moisture Sensitive Surface Mount Devices (SMDs)
PDF 293 KB
Application Note
AN1681: Grounding Techniques
PDF 509 KB
Application Note
AN1684: Nonideality of Ground
PDF 397 KB
Other
TB379: Thermal Characterization of Packaged Semiconductor Devices
PDF 653 KB
6 items

Design & Development

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

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Diagram of ECAD Models

Product Options

    Processing table
    Pkg. Type
    Carrier Type
    MOQ
    Buy / Sample
    Part Number
    ISL9211BIRU58XZ-T
    circleObsolete
    memory
    spa
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    		uTDFN Reel 3000
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