Narrow VDC Regulator/Charger with SMBus Interface Evaluation Board for Input >7V


The ISL9519TQFNEVAL2Z board evaluates the ISL9519 narrow VDC regulator/charger with SMBus interface. The ISL9519 is a highly integrated battery charger controller for Li-ion/Li-ion polymer batteries with SMBus interface controlling system voltage, charge current and input current limiting. The evaluation board includes a USB to SMBus interface to allow users to control the ISL9519 from a personal computer.

ISL9519TQFNEVAL2Z is designed for input voltage below 7V (i.e., 5V input) but has protection from input voltage up to 22V. It differs from the design for input voltage >7V (ISL9519EVAL1Z) in 3 ways. ISL9519TQFNEVAL2Z drives both input PFETs with AGATE to turn both ON when adapter voltage is high. ISL9519EVAL1Z drives SGATE ON only when input current is >300mA. ISL9519TQFNEVAL2Z has a circuit that connects input voltage to VDD when the input is less than 5.2V to bypass the internal LDO. ISL9519TQFNEVAL2Z has a zener to protect ADET from voltages >7V absolute maximum if the input voltage is >9.5V.

ISL9519 Key Features

  • ±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
  • Trickle Charge System for Deeply Discharged Batteries
  • 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
  • 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


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

ISL9519TQFNEVAL2Z Narrow VDC Regulator/Charger Eval Board

ISL9519TQFNEVAL2Z Narrow VDC Regulator/Charger Eval Board


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