Overview

The ISL6251, ISL6251A is a highly integrated battery charger controller for Li-Ion/Li-Ion polymer batteries and NiMH batteries. High efficiency is achieved by a synchronous buck topology and the use of a MOSFET, instead of a diode, for selecting power from the adapter or battery. The low side MOSFET emulates a diode at light loads to improve the light load efficiency and prevent system bus boosting. The constant output voltage can be selected for 2, 3 and 4 series Li-Ion cells with 0. 5% accuracy over-temperature. It can be also programmed between 4. 2V+5%/cell and 4. 2V-5%/cell to optimize battery capacity. When supplying the load and battery charger simultaneously, the input current limit for the AC adapter is programmable to within 3% accuracy to avoid overloading the AC adapter, and to allow the system to make efficient use of available adapter power for charging. It also has a wide range of programmable charging current. The ISL6251, ISL6251A provides outputs that are used to monitor the current drawn from the AC adapter, and monitor for the presence of an AC adapter. The ISL6251, ISL6251A automatically transitions from regulating current mode to regulating voltage mode.

ISL6251_ISL6251A Functional Diagram
ISL6251_ISL6251A Functional Diagram
  • ±0.5% Charge Voltage Accuracy (-10°C to +100°C)
  • ±3% Accurate Input Current Limit
  • ±3% Accurate Battery Charge Current Limit
  • ±25% Accurate Battery Trickle Charge Current Limit (ISL6251A)
  • Programmable Charge Current Limit, Adapter Current Limit and Charge Voltage
  • Fixed 300kHz PWM Synchronous Buck Controller with Diode Emulation at Light Load
  • Output for Current Drawn from AC Adapter
  • AC Adapter Present Indicator
  • Fast Input Current Limit Response
  • Input Voltage Range 7V to 25V
  • Supports 2, 3 and 4 Cells Battery Pack
  • Up to 17.64V Battery-Voltage Set Point
  • Thermal Shutdown
  • Support Pulse Charging
  • Less than 10µA Battery Leakage Current
  • Charge Any Battery Chemistry: Li-Ion, NiCd, NiMH, etc.
  • Pb-Free (RoHS Compliant)

Applications

  • Notebook, Desknote and Sub-notebook Computers
  • Personal Digital Assistant

Design & Development

Software & Tools
iSim:PE Offline Simulation Tool
iSim Personal Edition (iSim:PE) speeds the design cycle and reduces risk early in any project, identifying parts that can be used in current as well as next-generation designs.
Downloads
ISL6251 iSim:PE Model
 Simulator Renesas
1 item

Software Downloads
Type Title Date
Software & Tools - Other
ISL6251 Loop Gain Calculator
XLS 1.02 MB
1 item
ISL6251EVAL1Z (QSOP) Battery Charger Controller Eval Board

ISL6251EVAL1Z

Evaluation
Learn More

Low Cost Multi-Chemistry Battery Charger Controller Evaluation Board

The ISL6251EVAL1Z QSOP evaluation board is used to demonstrate the performance of the ISL6251 low cost multi-chemistry battery charger controller.

The ISL6251 is a...

Featured Documents:
ISL6251EVAL1Z User Guide

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
    ISL6251HAZ
    circleObsolete
    memory
    spa
    view_in_ar
    		QSOP Tube 1000
    ISL6251HAZ-T
    circleObsolete
    memory
    spa
    view_in_ar
    		QSOP Reel 2500
    ISL6251HRZ-T
    circleObsolete
    memory
    spa
    view_in_ar
    		QFN Reel 6000
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