The ISL9204 is a cost-effective, fully integrated high input
voltage single-cell Li-ion battery charger. This charger
performs the CC/CV charge function required by Li-ion
batteries. The charger accepts an input voltage up to 28V
but is disabled when the input voltage exceeds the OVP
threshold, minimum 10V, to prevent excessive power
dissipation. The 28V rating eliminates the overvoltage
protection circuit required in a low input voltage charger.
The charge current and the end-of-charge (EOC) current are
programmable with external resistors. When the battery
voltage is lower than a typical value of 2.8V, the charger
preconditions the battery with typically 17% of the
programmed charge current. When the charge current
reduces to the programmable EOC current level during the
CV charge phase, an EOC indication is provided by the CHG
pin, which is an open-drain output. An internal thermal
foldback function protects the charger from any thermal
failure.
Two indication pins (PPR and CHG) allow simple interface to
a microprocessor or LEDs. When no adapter is attached or
when disabled, the charger draws less than 1µA leakage
current from the battery.

Features
• 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
• 1% Voltage Accuracy
• Programmable Charge Current
• Programmable End-of-Charge Current
• Charge Current Thermal Foldback for Thermal
Protection
• Trickle Charge for Fully Discharged Batteries
• 28V Maximum Voltage for the Power Input
• Power Presence and Charge Indications
• Less than 1µA Leakage Current Off the Battery when No
Input Power Attached or Charger Disabled
• Ambient Temperature Range: -40°C to 85°C
• 2x3 DFN 8 Ld Packages
• Pb-Free Plus Anneal Available (RoHS Compliant)

Applications
• Mobile Phones
• Blue-Tooth Devices
• PDAs
• MP3 Players
• Stand-alone Chargers
• Other Handheld Devices