BQ24155中文资料I2C 单节 1.25A 降压电池充电器数据手册TI规格书

描述 Description

The bq24155 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 bq24155 integrates a synchronous PWM controller, power FETs, input current sensing, high-accuracy current and voltage regulation, and charge termination, into a small WCSP package. The bq24155 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 user-selectable minimum current level. A safety timer with reset control provides a safety backup for I2C interface. During normal operation, bq24155 automatically restarts the charge cycle if the battery voltage falls below an internal threshold and automatically enters sleep mode or high impedance mode when the input supply is removed. The charge status is reported to the host using the I2C compatible interface.During the charging process, the bq24155 monitors its junction temperature (TJ) and reduces the charge current once TJ increases to approximately 125°C. The bq24155 is available in 14-pin QFN package.

特性 Features

• Charge Faster than Linear Chargers
• Input Current Regulation Accuracy: ±5% (100 mA and 500 mA)
• Charge Current Regulation Accuracy: ±5%
• High-Efficiency Mini-USB/AC Battery Charger for Single-Cell Li-Ion and Li-Polymer Battery Packs
• 6-V Maximum Operating Input Voltage
• Integrated Power FETs for Up To 1.25-A Charge Rate
• Input Current
• Charge Voltage (3.5 V to 4.44 V)
• Termination Enable
• Synchronous Fixed-Frequency PWM Controller Operating at 3 MHz with 0% to 99.5% Duty Cycle
• Robust Protection
• Thermal Regulation and Protection
• Status Output for Charging and Faults
• Automatic Charging
• 3.5 mm x 3.5 mm 14-Pin QFN Package
• Mobile and Smart Phones
• Handheld Devices