ISL9222A
High Input Voltage Charger

Key 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
• Charge Current Thermal Foldback for Thermal Protection
• Trickle Charge for Fully Discharged Batteries
• 28V Maximum Voltage for the Power Input
• Power Presence Indication
• Less Than 1µA Leakage Current off the Battery When No Input Power Attached or Charger Disabled
• Ambient Temperature Range: -40°C to +85°C
• 8 Ld 2x3 TDFN Package
• Auxiliary OR-gate For System Booting Logic
• Pb-Free (RoHS Compliant)

Description

The ISL9222A is a cost-effective, fully integrated high input voltage single-cell Li-ion battery charger. The charger uses a CC/CV charge profile 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, typically 7.2V, to prevent excessive power dissipation. The 28V rating eliminates the overvoltage protection circuit required in a low input voltage charger.

The charge current is user programmable with an external resistor. When the battery voltage is lower than typically 2.55V, the charger preconditions the battery with typically 20% of the programmed charge current. An internal thermal foldback function protects the charger from any thermal failure.

AN indication pin PPR allows simple interface to a microprocessor or LED. When no adapter is attached or when disabled, the charger draws less than 1µA leakage current from the battery.

Applications

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