The ISL6255 and ISL6255A are highly integrated battery charger controllers for Li-Ion/Li-Ion polymer 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 also be 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 ISL6255 and ISL6255A provide outputs that are used to monitor the current drawn from the AC adapter, and monitor for the presence of an AC adapter. The ISL6255 and ISL6255A automatically transition from regulating current mode to regulating voltage mode. ISL6255 and ISL6255A have a feature for automatic power source selection by switching to the battery when the AC adapter is removed or switching to the AC adapter when the AC adapter is available. It also provides a DC adapter monitor to support aircraft power applications with the option of no battery charging.


  • ±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 (ISL6255A)
  • 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
  • Support 2, 3 and 4 Cells Battery Pack
  • Up to 17.64V Battery-Voltage Set Point
  • Control Adapter Power Source Select MOSFET
  • Thermal Shutdown
  • Aircraft Power Capable
  • DC Adapter Present Indicator
  • Battery Discharge MOSFET Control
  • Less than 10µA Battery Leakage Current
  • Support Pulse Charging
  • Charge Any Battery Chemistry: Li-Ion, NiCd, NiMH, etc.
  • Pb-Free Plus Anneal Available (RoHS Compliant)


  • Notebook, Desknote, and Sub-notebook Computers
  • Personal Digital Assistants (PDAs)

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active QSOP Tube 480
Active QSOP Reel 2500

Documentation & Downloads

Title language Type Format File Size Date
Datasheets & Errata
ISL6255, ISL6255A Datasheet Datasheet PDF 1.10 MB
User Guides & Manuals
ISL6255EVAL2Z User Guide Manual PDF 1.43 MB
ISL6255EVAL1Z User Guide Manual PDF 968 KB
Application Notes & White Papers
Five Easy Steps to Create a Multi-Load Power Solution White Paper PDF 846 KB
AN1681: Grounding Techniques Application Note PDF 509 KB
AN1684: Nonideality of Ground Application Note PDF 397 KB
PCN13037 - Alternate Bond Wire Material for Assembly of the Listed Intersil QSOP Packaged Product Product Change Notice PDF 268 KB
ISL6255 iSim:PE Model Schematic SXSCH 290 KB
ISL6255 Loop Gain Calculator Software & Tools - Others XLS 1.04 MB

Software & Tool Pages

Title Type Description Company
iSim:PE Offline Simulation Tool Simulator 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. Renesas

Boards & Kits

Part Number Title Type Company
ISL6255EVAL1Z Highly Integrated Battery Charger with Automatic Power Source Selector Evaluation Board Evaluation Renesas
ISL6255EVAL2Z Highly Integrated Battery Charger with Automatic Power Source Selector Evaluation Board Evaluation Renesas