ISL9301
High Input Voltage Charger With Power Path Management

Key Features

• Complete Charger for Single-Cell Li-ion/Polymer Batteries
• Power Path Management Optimize Charge and System Currents
• Intelligent Timeout Interval Based on Actual Charge Current
• Integrated Disconnect Switch to Disconnect the Battery
• 1% Charger Output 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 at VIN pin
• Power Presence and Charge Indications
• Ambient Temperature Range: -40°C to +85°C
• 10 Ld 3x3 DFN Package
• Pb-Free (RoHS Compliant)

Description

The ISL9301 is a fully integrated high input voltage single-cell Li-ion battery charger with power path management function. 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 10.5V OVP threshold. The 28V rating eliminates the overvoltage protection circuit required in a low-voltage charger. The charge current and the end-of-charge (EOC) current are programmable with external resistors. When the battery voltage is lower than 2.8V, the charger preconditions the battery with 16% of the programmed charge current. When the charge current reduces to the programmable EOC current level during the CV charge phase, the EOC indicator (CHG) will toggle to logic HIGH to indicate the end-of-charge condition. The charger will continue to charge until the user programmed timeout interval has elapsed, then the charger is terminated.

The ISL9301 uses separate power paths to supply the system load and charge the battery. This feature allows the system to immediately operate with a completely discharged battery. This feature also allows the charge to terminate when the battery is full while continuing to supply the system with the input source, thus minimizing unnecessary charge/discharge cycles and improving the battery life.

Two indication pins (PPR and CHG) allow simple interface to a microprocessor or LEDs.

Applications

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