The ISL9205, ISL9205A, ISL9205B, ISL9205C, and ISL9205D are integrated single-cell Li-ion or Li-polymer chargers capable of operating at an input voltage as low as 2. 5V. The low operating voltage allows the charger to work with a variety of AC adapters.

The ISL9205 family operates as a linear charger when the AC adapter is a voltage source. The battery is charged in a standard Li-ion charge profile, that is, a Constant Current phase followed by a Constant Voltage phase (CC/CV). The charge current during the Constant Current phase is determined by the external resistor connected to the IREF pin. When the adapter output is a current-limited voltage source and the current limit is smaller than the programmed constant current of the IC, the ISL9205 operates as a pulse charger where the charge current is determined by the current limit of the AC adapter during the Constant Current phase. The ISL9205 operates in a linear mode during the constant voltage phase in both adapter cases.

The ISL9205 family incorporates Thermaguard, which protects the IC against over-temperature. If the die temperature rises above a typical value of +100°C, the thermal foldback function reduces the charge current to prevent further temperature rise. The ISL9205 includes an external temperature monitoring function (not available in some package options). A Negative Temperature Coefficient (NTC) thermistor is connected between the TEMP pin and GND to monitor the battery or ambient temperature. The ISL9205 also includes a timer to set the time reference for various charge time limits. The timer is programmable with an external capacitor. Two logic inputs and two open-drain logic outputs are available for controlling the charger and indicating the charger status. The EN pin enables the charger. The TOEN pin (available in the ISL9205) enables the timeout function so that the charge is terminated when the preset time limits have been reached. The FAULT pin is an open-drain output that turns on when a fault condition is encountered. The STATUS pin is also an open-drain output that turns on when the charger is delivering current.


  • Complete charger for single-cell Li-ion/polymer batteries
  • Integrated pass element and current sensor
  • No external blocking diode required
  • Low component count and cost
  • 25mV voltage accuracy over-temperature and input voltage range
  • 15mV voltage accuracy at room temperature
  • Programmable charge current
  • Programmable end-of-charge current (ISL9205)
  • Charge current thermal foldback for thermal protection (Thermaguard)
  • Trickle charge for fully discharged batteries
  • Power presence and charge indications
  • NTC interface (not available in some package options)
  • Less than 3μA leakage current off the battery when no input power attached or charger disabled
  • Ambient temperature range: -40°C to +85°C
  • DFN, QFN packages
  • Pb-free (RoHS compliant)


  • Mobile Phones
  • Blue-Tooth Devices
  • PDAs
  • MP3 Players
  • Stand-Alone Cradle or Travel Chargers
  • Other Handheld Devices


Title language Type Format File Size Date
star ISL9205, ISL9205A, ISL9205B, ISL9205C, ISL9205D Datasheet Datasheet PDF 791 KB
AN1681: Grounding Techniques Application Note PDF 509 KB
AN1684: Nonideality of Ground Application Note PDF 397 KB
PCN21016 - Correction of Moisture Sensitivity Level and Alternate bond wire material of the listed Renesas DFN, QFN, TDFN, TQFN packaged products Product Change Notice PDF 202 KB
PCN20029A - Alternate bond wire material and assembly facility of the listed Renesas QFN packaged products Product Change Notice PDF 326 KB
Five Easy Steps to Create a Multi-Load Power Solution White Paper PDF 846 KB


memoryBoards & Kits

Part Number Title Type Company
ISL9205DEVAL1Z Li-Ion Battery Charger Evaluation Board Evaluation Renesas