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, T_REG, is exceeded.

• AEC-Q100 qualified for automotive applications
  • Temperature grade 1: –40°C ≤ TA ≤ 125°C
  • HBM ESD classification level 2
  • CDM ESD classification level C4B
• 40-V load-dump tolerant to support charging back-up battery directly from main battery, 3-V to 18-V operating
• Automatic Sleep Mode for low power consumption
  • 350-nA battery leakage current
  • 2-μA input leakage current when charge disabled
• Support multi-chemistry battery
  • 1- to 2-cell Li-Ion, Li-Poly, and LiFePO4
  • 1- to 6-cell NiMH with intermittent-charging support
• External resistor programmable operation
  • VSET to set battery regulation voltage from 3.5 V to 8.4 V for Li-Ion, or 1- to 6-cell for NiMH
  • ISET to set charge current from 10 mA to 800 mA
  • CHM_TMR to set battery chemistry as Li+ or NiMH, and charge timer duration
• High accuracy
  • ±0.5% charge voltage accuracy
  • ±10% charge current accuracy
• Charging features
  • Precharge current 20% of ISET
  • Termination current 10% of ISET
  • NTC thermistor input to monitor battery temperature
  • CE pin for charging function control
  • Two Open-drain output for status and fault indication
• Integrated fault protection
  • 18-V IN overvoltage protection
  • VSET based OUT overvoltage protection
  • 1000-mA overcurrent protection
  • 125°C thermal regulation; 150°C thermal shutdown protection
  • OUT short-circuit protection
  • VSET, ISET, CHM_TMR pins short/open protection

• Number of series cells
• 1, 2, 3, 4, 5, 6
• Charge current (Max) (A)
• 0.8
• Operating Vin (Max) (V)
• 18
• Cell chemistry
• Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4, NiMH
• Battery charge voltage (Min) (V)
• 3.5
• Battery charge voltage (Max) (V)
• 8.4
• Absolute Vin (safety rating) (Max) ((V))
• 40
• Control interface
• Standalone (RC-Settable)
• Features
• BAT temp thermistor monitoring (hot/cold profile), IC thermal regulation, Input OVP
• Operating Vin (Min) (V)
• 3
• Rating
• Automotive

BQ25171-Q1的完整型号有：BQ25171QWDRCRQ1，以下是这些产品的关键参数及官网采购报价：

BQ25171QWDRCRQ1，工作温度：-40 to 125，封装：VSON (DRC)-10，包装数量MPQ：3000个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网BQ25171QWDRCRQ1的批量USD价格：.683（1000+）

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BQ25171EVM 评估模块 (EVM) 旨在帮助用户评估和测试 BQ25171 器件的各种工作模式。

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此设计展示了使用 1 节锂电池进行应急供电的汽车备用电池。主电源输入额定值为 6V 至 18V 标称电压（2.7V 至 36V 峰值），以便符合 12V 汽车要求。辅助电源输入配有一个电量监测计，用于监测单节锂电池，并支持 2V 至 4.35V 的输入电压。板载学习负载可实现备用电池的寿命终止检测。