The ISL9519 is a highly integrated narrow VDC system voltage regulator and battery charger controller. Operating parameters are programmable over the System Management Bus (SMBus). The ISL9519 is designed for applications where the system power source is either the battery pack or the output of the regulator/charger. This makes the max voltage to the system equal to the max battery voltage instead of the max adapter voltage. The ISL9519 also includes a patented system to control trickle charging deeply discharged batteries while maintaining system voltage at a user-defined minimum. High efficiency is achieved with a DC/DC synchronous-rectifier buck converter, equipped with diode emulation and variable switching frequency for enhanced light load efficiency and AC-adapter boosting prevention. The ISL9519 can charge one, two or three series-connected Lithium-ion cells, at up to 8A charge current. Default settings for 1-, 2- or 3-cell operation at power-up are selected by an external pin. Integrated MOSFET drivers and bootstrap diode result in fewer components and smaller implementation area. Low offset current-sense amplifiers provide high accuracy. The ISL9519 provides an open drain digital output that indicates the presence of the AC-adapter. The ISL9519 also provides an analog output that indicates the adapter current.


  • ±0.5% System Voltage Accuracy (-10 °C to +100 °C)
  • ±3% Accurate Input Current Limit (-10 °C to +100 °C)
  • ±3% Accurate Battery Charge Current Limit
  • Variable Switching Frequency at Light Load Conditions for Higher Efficiency
  • Fixed Frequency Operation at Higher Loads
  • Fixed Frequency Mode can be Forced by an External Pin
  • Trickle Charge System for Deeply Discharged Batteries
  • Automatic Trickle Charge Current (256mA)
  • Holds Minimum Voltage to System
  • SMBus 2-Wire Serial Interface
  • Default System Voltage Values for 1-Cell, 2-Cell or 3-Cell Operation Selected by an External Pin
  • Adapter In-rush FET Control
  • Adapter Isolation FET Control
  • Battery Short Circuit Protection
  • Fast System-Load Transient Response
  • Monitor Outputs
  • Adapter Current (2.5% Accuracy)
  • AC-adapter Present Indicator
  • 11-Bit Max System Voltage Setting
  • 7-Bit Min System Voltage Setting
  • 6-Bit Charge Current Setting
  • Over 8A Battery Charger Current
  • 6-Bit Adapter Current Setting
  • Over 8A Adapter Current
  • +4.5V to +22V Adapter Voltage Range
  • Pb-Free (RoHS Compliant)


  • Notebook Computers
  • Tablet PCs
  • Portable Equipment with Rechargeable Batteries

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active TQFN Tube 75
Active TQFN Reel 6000
Active TQFN Tube 75
Active TQFN Reel 6000

Documentation & Downloads

Title language Type Format File Size Date
Datasheets & Errata
ISL9519 Datasheet Datasheet PDF 1.34 MB
ISL9519 Data Short Short Form Datasheet PDF 161 KB
User Guides & Manuals
ISL9519TQFNEVAL2Z User Guide Manual PDF 1.11 MB
ISL9519EVAL1Z User Guide Manual PDF 1.10 MB
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
PCN14036 - Wafer fabrication Site Change for Listed Intersil Products - Palm Bay, Florida Product Change Notice PDF 294 KB
PCN10055 - Alternate Bond Wire Material for Assembly of the Listed Intersil DFN/QFN Packaged Products - STATS ChipPAC Malaysia Product Change Notice PDF 248 KB
ISL9519 iSim:PE Model Schematic SXSCH 227 KB
ISL9519 Compensation Component Calculator Software & Tools - Others XLS 69 KB
ISL9519 CONTROL Software Installer Library ZIP 163.25 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
ISL9519CEVAL1Z Narrow VDC Regulator/Charger with SMBus Interface Evaluation Board Evaluation Renesas
ISL9519EVAL1Z Narrow VDC Regulator/Charger with SMBus Interface Evaluation Board Evaluation Renesas
ISL9519TQFNEVAL2Z Narrow VDC Regulator/Charger with SMBus Interface Evaluation Board for Input >7V Evaluation Renesas