The BQ25672 is a fully integrated switch-mode buck charger for 1-4 cell Li-ion batteries and Li-polymer batteries. The BQ25672 is also capable of producing a buck-boost, 5 V to 12 V, output voltage on VBUS when operating in OTG Mode. The integration includes the switching MOSFETs, input and charging current sensing circuits, the battery FET and all the loop compensation of the converter. It uses NVDC power path management, regulating the system not dropping below a configurable minimum system voltage. When system power exceeds the input source rating, battery supplement mode supports the system without overloading the input source. It also maximizes power from photovoltaic panels using its built-in V_OC scaling MPPT algorithm.

The charger supports the NVDC power path management, in which the system is regulated at a voltage slightly higher than the battery voltage, but not drop below the minimum system voltage. The system keeps operating even when the battery is completely discharged or removed. When load power exceeds input source rating, the battery gets into supplement mode and prevents the input source from being overloaded and the system from crashing.

The input current optimizer (ICO) allows the detection of maximum power point of an unknown input source.

Besides the I²C host controlled charging mode, this charger also supports autonomous charging mode. After power up, the charging is enabled with default register settings. The device can complete a charging cycle without any software engagements. It detects battery voltage and charges the battery in different phases: trickle charging, pre-charging, constant current (CC) charging and constant voltage (CV) charging. At the end of the charging cycle, the charger automatically terminates when the charge current is below a pre-set limit (termination current) in the constant voltage phase. When the full battery falls below the recharge threshold, the charger will automatically start another charging cycle.

In the absence of input sources, this device supports USB On-the-Go (OTG) functionality by discharging the battery to generate an adjustable, buck-boost, 5-V to 12-V output voltage on VBUS with 10mV step size.

The charger provides various safety features for battery charging and system operations, including battery temperature negative thermistor monitoring, trickle charge, pre-charge and fast charge timers and over-voltage/over-current protections on battery and input. The thermal regulation reduces charge current when the junction temperature exceeds a programmable threshold. The STAT output of the device reports the charging status and any fault conditions. The INT pin immediately notifies host when fault occurs.

The device also provides a 16-bit analog-to-digital converter (ADC) for monitoring charge current and input/battery/system (VAC, VBUS, BAT, SYS, TS) voltages.

It is available in a 29-pin 4mm × 4mm QFN package.

• High power density, high integration buck charger for 1-4 cell batteries
  • Integrates switching MOSFETs, BATFET
  • Integrates input and charging current sensing
• Highly efficient
  • 750-kHz or 1.5-MHz switching frequencies
  • 3-A charging current with 10-mA resolution
    • 96.5% efficient: 16-V battery at 3A from 20V
• Supports a wide range of input sources
  • Autonomously sampled VOC maximum power point tracking (MPPT) for charging from a photovoltaic panel
  • 3.6-V to 24-V wide input operating voltage range with 30-V absolute maximum rating
  • Maximum power tracking with input voltage dynamic power management (VINDPM) up to 22 V and input current dynamic power management (IINDPM) up to 3.3 A
  • Detects USB BC1.2, HVDCP and non-standard adapters
• Dual-input power mux controller (optional) for source selection
• Narrow voltage DC (NVDC) power path
• Powers USB port from battery (USB OTG)
  • 5-V to 12-V OTG buck-boost output voltage with 10-mV resolution
  • OTG output current regulation up to 2 A with 40-mA resolution
• Flexible autonomous and I2C mode for optimal system performance
• Integrated 16-bit ADC for voltage, current, and temperature monitoring
• Low battery quiescent current
  • 17 μA for battery only operation
  • 500 nA in Charger Shutdown Mode
• High accuracy
  • -0.25% to +0.65% charge voltage regulation for 2S batteries
  • ±5% charge current regulation
  • ±5% input current regulation
• Safety
  • Thermal regulation and thermal shutdown
  • Input/battery OVP and OCP
  • Converter MOSFETs OCP
  • Charging safety timer
• Package
  • 29-Pin 4 mm × 4 mm QFN

• Number of series cells
• 1, 2, 3, 4
• Charge current (Max) (A)
• 3
• Operating Vin (Max) (V)
• 24
• Cell chemistry
• Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4
• Battery charge voltage (Min) (V)
• 3
• Battery charge voltage (Max) (V)
• 18.8
• Absolute Vin (safety rating) (Max) ((V))
• 30
• Control interface
• I2C
• Features
• BAT temp thermistor monitoring (JEITA profile), IC thermal regulation, ICO (Input Current Optimization), IINDPM (Input current limit), Input OVP, Integrated ADC, Power Path, Solar input/MPPT, USB D+/D-/BC1.2 integrated, USB OTG integrated, VINDPM (Input voltage threshold to maximize adaptor power)
• Operating Vin (Min) (V)
• 6
• Rating
• Catalog

BQ25672的完整型号有：BQ25672RQMR，以下是这些产品的关键参数及官网采购报价：

BQ25672RQMR，工作温度：-40 to 85，封装：VQFN-HR (RQM)-29，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BQ25672RQMR的批量USD价格：1.6（1000+）

BQ25672EVM — 用于具有双输入和 MPPT 的 I2C 控制型 1-4 节、3A 降压充电器的 BQ25672 评估模块

BQ25672EVM 评估模块 (EVM) 用于评估 BQ25672 器件。BQ25672 是一款采用 HOTROD (QFN) 封装的集成式开关模式降压电池充电管理器件，适用于 1 节至 4 节串联锂离子和锂聚合物电池，输入电压为 6V 至 24V，具有可编程的 750KHz 和 1500KHz 开关频率。具有充电和系统设置的 I2C 串行接口使得此器件成为真正的灵活解决方案。

TI-CHARGER-GUI — 用于 USB2ANY 和电池充电评估模块的 GUI 软件

TI-CHARGER-GUI 提供基于网络的或独立的图形用户界面，可辅助评估、设计、配置或测试电池充电器产品。该软件可实现对寄存器的全面访问，并提供一个简单接口用于发送时序命令。