Full USB-Compliance Battery Charger

The bq24153A/6A/8/9 is a compact, flexible, high-efficiency, USB-friendly switch-mode charge management device for single-cell Li-ion and Li-polymer batteries used in a wide range of portable applications. The charge parameters can be programmed through an I2C interface. The IC integrates a synchronous PWM controller, power MOSFETs, input current sensing, high-accuracy current and voltage regulation, and charge termination, into a small WCSP package.

The IC charges the battery in three phases: conditioning, constant current and constant voltage. The input current is automatically limited to the value set by the host. Charge is terminated based on battery voltage and user-selectable minimum current level. A safety timer with reset control provides a safety backup for I2C interface.

Features

• Charge Faster than Linear Chargers
• High-Accuracy Voltage and Current Regulation
• Input Current Regulation Accuracy: ±5% (100 mA and 500 mA)
• Charge Voltage Regulation Accuracy: ±0.5% (25°C), ±1% (0°C to 125°C)
• Charge Current Regulation Accuracy: ±5%
• Input Voltage Based Dynamic Power Management (VIN DPM)
• Bad Adaptor Detection and Rejection
• Safety Limit Register for Maximum Charge Voltage and Current Limiting
• High-Efficiency Mini-USB/AC Battery Charger for Single-Cell Li-Ion and Li-Polymer Battery Packs
• 20-V Absolute Maximum Input Voltage Rating
• 9-V Maximum Operating Input Voltage-bq24156A/9
• 6-V Maximum Operating Input Voltage-bq24153A/8
• Built-In Input Current Sensing and Limiting
• Integrated Power FETs for Up To 1.5-A Charge Rate-bq24156A/9, 1.25A-bq24153A/8
• Programmable Charge Parameters through I2C Compatible Interface (up to 3.4 Mbps):
• Input Current Limit
• VIN DPM Threshold
• Fast-Charge/Termination Current
• Charge Regulation Voltage (3.5 V to 4.44 V)
• Low Charge Current Mode Enable/Disable