The BQ2405x series of devices are highly integrated Li-Ion and Li-Pol linear chargers devices targeted at space-limited portable applications. The devices operate from either a USB port or AC adapter. The high-input voltage range with input overvoltage protection supports low-cost unregulated adapters.

The BQ2405x has a single power output that charges the battery. A system load can be placed in parallel with the battery as long as the average system load does not keep the battery from charging fully during the 10-hour safety timer.

The battery is charged in three phases: conditioning, constant current, and constant voltage. In all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge current if an internal temperature threshold is exceeded.

The charger power stage and charge current sense functions are fully integrated. The charger function has high accuracy current and voltage regulation loops, charge status display, and charge termination. The precharge current and termination current threshold are programmed through an external resistor. The fast charge current value is also programmable through an external resistor.

• Charging
  • 1% Charge voltage accuracy
  • 10% Charge current accuracy
  • Pin selectable USB 100-mA and 500-mA maximum input current limit
  • Programmable termination and precharge threshold
• Protection
  • 30-V Input Rating; With 6.6-V input overvoltage protection
  • Input voltage dynamic power management
  • 125 °C Thermal regulation; 150°C thermal shutdown protection
  • OUT Short-circuit protection and ISET short detection
  • Operation over JEITA range through battery NTC - ? fast-charge-current at cold, 4.06 V at hot
  • Fixed 10-hour safety timer
• System
  • Auto input source detection (D+, D– pins)
    • No device transceiver required
    • USB Friendly
  • Automatic termination and timer disable mode (TTDM) for absent battery pack with thermistor
  • Status indication – charging/done
  • Available in small 2-mm × 2-mm package

• Number of series cells
• 1
• Charge current (Max) (A)
• 1
• Operating Vin (Max) (V)
• 6.45
• Cell chemistry
• Li-Ion/Li-Polymer
• Battery charge voltage (Min) (V)
• 4.2
• Battery charge voltage (Max) (V)
• 4.2
• Absolute Vin (safety rating) (Max) ((V))
• 30
• Control interface
• Standalone (RC-Settable)
• Features
• BAT temp thermistor monitoring (JEITA profile), BAT temp thermistor monitoring (hot/cold profile), IC thermal regulation, Input OVP, USB D+/D-/BC1.2 integrated, VINDPM (Input voltage threshold to maximize adaptor power)
• Operating Vin (Min) (V)
• 3.5
• Rating
• Catalog

BQ24050的完整型号有：BQ24050DSQR、BQ24050DSQT，以下是这些产品的关键参数及官网采购报价：

BQ24050DSQR，工作温度：0 to 125，封装：WSON (DSQ)-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：NIPDAUAG，TI官网BQ24050DSQR的批量USD价格：.541（1000+）

BQ24050DSQT，工作温度：0 to 125，封装：WSON (DSQ)-10，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAUAG，TI官网BQ24050DSQT的批量USD价格：.649（1000+）

BQ24050EVM — BQ24050 评估模块：0.8A 单输入单节锂离子电池充电器

0.8A 单输入单节锂离子电池充电器

bq2405x 系列器件是面向空间受限的便携应用的高度集成的锂离子线性充电器器件。该器件由 USB 端口或 AC 适配器供电。bq2405x 具有为电池充电的单电源输出。如果在 10 小时的安全定时器期间内平均系统负载无法让电池充满电，则可以使系统负载与电池并联。bq24050/2/5 具有集成 USB 检测例程，它会查找上电的 USB 连接。如果检测到适配器，它会将充电输入控制初始设置为已编程的 ISET 电平；如果检测到 USB 端口，则将它设置为 USB100 模式。如果电池放电、USB (...)

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此参考设计展示了使用锂离子纽扣电池的完整单芯电池电源解决方案的功能和性能。它可通过外部适配器或 USB 端口供电。此板连接到计算机时，可在 GUI 上监控负载电流、充电状态以及关于电池的更多信息。