The bq25708 is a synchronous NVDC battery buck-boost charge controller, offering low component count, high efficiency solution for space-constraint, multi-chemistry battery charging applications.

The NVDC-1 configuration allows the system to be regulated at battery voltage, but not drop below system minimum voltage. The system keeps operating even when the battery is completely discharged or removed. When load power exceeds input source rating, the battery goes into supplement mode and prevents the system from crashing.

The bq25708 charges battery from a wide range of input sources including USB adapter, high voltage USB PD sources and traditional adapters.

During power up, the charger sets converter to buck, boost or buck-boost configuration based on input source and battery conditions. The charger automatically transits among buck, boost and buck-boost configuration without host control.

The bq25708 monitors adapter current, battery current and system power. The flexibly programmed PROCHOT output goes directly to CPU for throttle back when needed.

• Charge 1- to 4-Cell Battery From Wide Range of Input Sources
  • 3.5-V to 24-V Input Operating Voltage
  • Supports USB2.0, USB 3.0, USB 3.1 (Type C), and USB_PD Input Current Settings
  • Seamless Transition Between Buck and Boost Operation
  • Input current and Voltage Regulation (IDPM and VDPM) Against Source Overload
• Power/Current Monitor for CPU Throttling
  • Comprehensive PROCHOT Profile, IMVP8 Compliant
  • Input and Battery Current Monitor
  • System Power Monitor, IMVP8 Compliant
• Narrow-VDC (NVDC) Power Path Management
  • Instant-On With No Battery or Deeply Discharged Battery
  • Battery Supplements System When Adapter is Fully-Loaded
  • Ideal Diode Operation in Supplement Mode
• 800-kHz or 1.2-MHz Programmable Switching Frequency for 1-μH to 3.3-μH Inductor
• Host Control Interface for Flexible System Configuration
  • SMBus Port for Optimal System Performance and Status Reporting
  • Hardware Pin to Set Input Current Limit Without EC Control
• Integrated ADC to Monitor Voltage, Current and Power
• High Accuracy Regulation and Monitor
  • ±0.5% Charge Voltage Regulation
  • ±2% Input/Charge Current Regulation
  • ±2% Input/Charge Current Monitor
  • ±5% Power Monitor
• Safety
  • Thermal Shutdown
  • Input, System, Battery Overvoltage Protection
  • MOSFET Inductor Overcurrent Protection
• Low Battery Quiescent Current
• Input Current Optimizer (ICO) to Extract Max Input Power
• Charge any Battery Chemistry: Li+, LiFePO4, NiCd, NiMH, Lead Acid
• Package: 32-Pin 4 × 4 WQFN

• Number of series cells
• 1, 2, 3, 4
• Charge current (Max) (A)
• 8.128
• Operating Vin (Max) (V)
• 24
• Cell chemistry
• Lead Acid, Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4, NiCd, NiMH
• Battery charge voltage (Min) (V)
• 1.024
• Battery charge voltage (Max) (V)
• 19.2
• Absolute Vin (safety rating) (Max) ((V))
• 30
• Control interface
• SMBus
• Features
• BAT temp thermistor monitoring (hot/cold profile), IC thermal regulation, ICO (Input Current Optimization), IINDPM (Input current limit), Input OVP, Integrated ADC, Power Path, VINDPM (Input voltage threshold to maximize adaptor power)
• Operating Vin (Min) (V)
• 3.5
• Rating
• Catalog

BQ25708的完整型号有：BQ25708RSNR、BQ25708RSNT，以下是这些产品的关键参数及官网采购报价：

BQ25708RSNR，工作温度：-40 to 85，封装：QFN (RSN)-32，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BQ25708RSNR的批量USD价格：1.94（1000+）

BQ25708RSNT，工作温度：-40 to 85，封装：QFN (RSN)-32，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BQ25708RSNT的批量USD价格：2.328（1000+）

BQSTUDIO — Battery Management Studio (bqStudio) 软件套件

Battery Management Studio (bqStudio) 提供一整套稳健的工具来帮助您评估、配置、测试 TI 电池管理产品以及利用其进行设计或以其他方式对其加以利用。这包括提供对寄存器和数据内存的完全访问，其中包括支持实时查看、绘制和记录轻松连接以发送命令、控制低级通信和 I/O，以及自动和指导支持配置、校准、执行学习周期以及生成有用的文件以将器件投入生产。此外，Battery Management Studio 还为监测计开发套件 (bq27GDK000EVM) 提供自动化和脚本支持。