The bq2423x series of devices are highly integrated Li-ion linear chargers and system power-path management devices targeted at space-limited portable applications. The devices operate from either a USB port or ac adapter and support charge currents between 25 mA and 500 mA. The high-input-voltage range with input overvoltage protection supports low-cost, unregulated adapters. The USB input current limit accuracy and start-up sequence allow the bq2423x to meet USB-IF inrush current specification. Additionally, the input dynamic power management (V_IN-DPM) prevents the charger from crashing poorly designed or incorrectly configured USB sources.

The bq2423x features dynamic power-path management (DPPM) that powers the system while simultaneously and independently charging the battery. The DPPM circuit reduces the charge current when the input current limit causes the system output to fall to the DPPM threshold, thus supplying the system load at all times while monitoring the charge current separately. This feature reduces the number of charge and discharge cycles on the battery, allows for proper charge termination, and enables the system to run with a defective or absent battery pack. Additionally, this enables instant system turn-on even with a totally discharged battery. The power-path management architecture also permits the battery to supplement the system current requirements when the adapter cannot deliver the peak system currents, enabling the use of a smaller adapter.

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 the 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 input current limit and charge current are programmable using external resistors.

• Fully Compliant USB Charger
  • Selectable 100-mA and 500-mA Maximum Input Current
  • 100-mA Maximum Current Limit Ensures Compliance to USB-IF Standard
  • Input-based Dynamic Power Management (VIN- DPM) for Protection Against Poor USB Sources
• 28-V Input Rating With Overvoltage Protection
• Integrated Dynamic Power-Path Management (DPPM) Function Simultaneously and Independently Powers the System and Charges the Battery
• Supports up to 500-mA Charge Current With Current Monitoring Output (ISET)
• Programmable Input Current Limit up to 500?mA for Wall Adapters
• Programmable Termination Current (bq24232)
• Programmable Precharge and Fast-Charge Safety Timers
• Reverse Current, Short-Circuit, and Thermal Protection
• NTC Thermistor Input
• Proprietary Start-Up Sequence Limits Inrush Current
• Status Indication – Charging/Done, Power Good
• Small 3 mm × 3 mm 16-Lead QFN Package

• Number of series cells
• 1
• Charge current (Max) (A)
• 0.5
• Operating Vin (Max) (V)
• 6.4
• 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))
• 28
• Control interface
• Standalone (RC-Settable)
• Features
• BAT temp thermistor monitoring (hot/cold profile), Input OVP, Power Path, VINDPM (Input voltage threshold to maximize adaptor power)
• Operating Vin (Min) (V)
• 4.35
• Rating
• Catalog

BQ24230的完整型号有：BQ24230RGTR、BQ24230RGTT，以下是这些产品的关键参数及官网采购报价：

BQ24230RGTR，工作温度：-40 to 85，封装：VQFN (RGT)-16，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BQ24230RGTR的批量USD价格：0.735（1000+）

BQ24230RGTT，工作温度：-40 to 85，封装：VQFN (RGT)-16，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：NIPDAU，TI官网BQ24230RGTT的批量USD价格：0.882（1000+）

BQ24230EVM — BQ24230 评估模块

本用户指南介绍了 bq24072/3/4/5 和 bq24320/2 (bqTiny-III™) 评估模块 (EVM)。该 EVM 为使用 bq24072/3/4/5 和 bq24320/2 产品系列的便携式应用的充电管理和系统电源解决方案的性能评估提供了便捷方法。现已推出经过完整设计和测试的模块。该充电器旨在为使用直流电源的单节锂离子或锂聚合物应用（查看数据表以选择合适器件）的系统或充电器提供 1.5A 的连续电流。该充电器出厂设计为提供 0.9A 的充电电流。虽然该 EVM 被设计成独立的评估模块，但也可以通过连接器和接头与系统和主机相连。

Linear Charger NTC Calculator

TIDA-00600 的主要目的是为同时需要可充电电池和直流连接器电源的 ZigBee 系统提供一个成本优化的小型电源管理解决方案。TIDA-00600 设计为电源管理部门提供测试数据、设计指南和光绘文件。

此参考设计采用 LP5907（具有高 PSRR 和低噪声的超小型 LDO）和 BQ24230（独立式电池充电器）。