BQ25171-Q1中文资料适用于 1-2 节锂离子、磷酸铁锂和 1-6 节镍氢电池的汽车类 800mA 线性电池充电器数据手册TI规格书

描述 Description

The BQ25171-Q1 is an automotive rated, 800-mA linear charger for 1-cell and 2-cell Li-Ion, Li-Polymer, and LiFePO4, in addition to 1-cell up to 6-cell NiMH battery applications.The device has a single power output that charges the battery. The system load can be placed in parallel with the battery, as long as the average system load does not prevent the battery from charging fully within the safety timer duration. When the system load is placed in parallel with the battery, the charge current is shared between the system and the battery.

The device has three phases for charging a Li-Ion battery: precharge to recover a fully discharged battery, fast-charge constant current to supply the bulk of the charge, and voltage regulation to reach full capacity.

The device charges a NiMH in constant current mode only, and terminates the charge cycle when the programmable timer expires or the battery voltage exceeds the VOUT_OVP threshold.In all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge current if an internal temperature threshold, TREG, is exceeded.

特性 Features

• AEC-Q100 qualified for automotive applications
• HBM ESD classification level 2
• 40-V load-dump tolerant to support charging back-up battery directly from main battery, 3-V to 18-V operating
• 350-nA battery leakage current
• Support multi-chemistry battery
• 1- to 6-cell NiMH with intermittent-charging support
• External resistor programmable operation
• ISET to set charge current from 10 mA to 800 mA
• High accuracy
• ±10% charge current accuracy
• Charging features
• Termination current 10% of ISET
• CE pin for charging function control
• Integrated fault protection
• VSET based OUT overvoltage protection
• 125°C thermal regulation; 150°C thermal shutdown protection
• VSET, ISET, CHM_TMR pins short/open protection