ZHCSGD7 May 2017

PRODUCTION DATA. 

  1. 特性
  2. 应用
  3. 说明
  4. 修订历史记录
  5. 说明 (续)
  6. Pin Configuration and Functions
  7. Specifications
    1. 7.1Absolute Maximum Ratings
    2. 7.2ESD Ratings
    3. 7.3Recommended Operating Conditions
    4. 7.4Thermal Information
    5. 7.5Electrical Characteristics
    6. 7.6Timing Requirements
    7. 7.7Typical Characteristics
  8. Detailed Description
    1. 8.1Overview
    2. 8.2Functional Block Diagram
    3. 8.3Feature Description
      1. 8.3.1 Power-Up from Battery Without DC Source
      2. 8.3.2Power-Up From DC Source
        1. 8.3.2.1CHRG_OK Indicator
        2. 8.3.2.2 Input Voltage and Current Limit Setup
        3. 8.3.2.3 Battery Cell Configuration
        4. 8.3.2.4Device Hi-Z State
      3. 8.3.3USB On-The-Go (OTG)
      4. 8.3.4 Converter Operation
        1. 8.3.4.1 Inductor Setting through IADPT Pin
        2. 8.3.4.2Continuous Conduction Mode (CCM)
        3. 8.3.4.3Pulse Frequency Modulation (PFM)
      5. 8.3.5Current and Power Monitor
        1. 8.3.5.1High-Accuracy Current Sense Amplifier (IADPT and IBAT)
        2. 8.3.5.2High-Accuracy Power Sense Amplifier (PSYS)
      6. 8.3.6Input Source Dynamic Power Manage
      7. 8.3.7Two-Level Adapter Current Limit (Peak Power Mode)
      8. 8.3.8Processor Hot Indication
        1. 8.3.8.1PROCHOT During Low Power Mode
        2. 8.3.8.2PROCHOT Status
      9. 8.3.9Device Protection
        1. 8.3.9.1 Watchdog Timer
        2. 8.3.9.2 Input Overvoltage Protection (ACOV)
        3. 8.3.9.3 Input Overcurrent Protection (ACOC)
        4. 8.3.9.4System Overvoltage Protection (SYSOVP)
        5. 8.3.9.5 Battery Overvoltage Protection (BATOVP)
        6. 8.3.9.6 Battery Short
        7. 8.3.9.7Thermal Shutdown (TSHUT)
    4. 8.4Device Functional Modes
      1. 8.4.1Forward Mode
        1. 8.4.1.1System Voltage Regulation with Narrow VDC Architecture
        2. 8.4.1.2Battery Charging
      2. 8.4.2USB On-The-Go
    5. 8.5Programming
      1. 8.5.1SMBus Interface
        1. 8.5.1.1SMBus Write-Word and Read-Word Protocols
        2. 8.5.1.2Timing Diagrams
    6. 8.6Register Map
      1. 8.6.1 Setting Charge and PROCHOT Options
        1. 8.6.1.1ChargeOption0 Register (SMBus address = 12h) [reset = E20Eh]
        2. 8.6.1.2ChargeOption1 Register (SMBus address = 30h) [reset = 211h]
        3. 8.6.1.3ChargeOption2 Register (SMBus address = 31h) [reset = 2B7]
        4. 8.6.1.4ChargeOption3 Register (SMBus address = 32h) [reset = 0h]
        5. 8.6.1.5ProchotOption0 Register (SMBus address = 33h) [reset = 04A54h]
        6. 8.6.1.6ProchotOption1 Register (SMBus address = 34h) [reset = 8120h]
        7. 8.6.1.7ADCOption Register (SMBus address = 35h) [reset = 2000h]
      2. 8.6.2 Charge and PROCHOT Status
        1. 8.6.2.1ChargerStatus Register (SMBus address = 20h) [reset = 0000h]
        2. 8.6.2.2ProchotStatus Register (SMBus address = 21h) [reset = 0h]
      3. 8.6.3 ChargeCurrent Register (SMBus address = 14h) [reset = 0h]
        1. 8.6.3.1 Battery Pre-Charge Current Clamp
      4. 8.6.4 MaxChargeVoltage Register (SMBus address = 15h) [reset value based on CELL_BATPRESZ pin setting]
      5. 8.6.5 MinSystemVoltage Register (SMBus address = 3Eh) [reset value based on CELL_BATPRESZ pin setting]
        1. 8.6.5.1System Voltage Regulation
      6. 8.6.6 Input Current and Input Voltage Registers for Dynamic Power Management
        1. 8.6.6.1Input Current Registers
          1. 8.6.6.1.1IIN_HOST Register With 10-mΩ Sense Resistor (SMBus address = 3Fh) [reset = 4000h]
          2. 8.6.6.1.2IIN_DPM Register With 10-mΩ Sense Resistor (SMBus address = 022h) [reset = 0h]
          3. 8.6.6.1.3InputVoltage Register (SMBus address = 3Dh) [reset = VBUS-1.28V]
      7. 8.6.7 OTGVoltage Register (SMBus address = 3Bh) [reset = 0h]
      8. 8.6.8 OTGCurrent Register (SMBus address = 3Ch) [reset = 0h]
      9. 8.6.9 ADCVBUS/PSYS Register (SMBus address = 23h)
      10. 8.6.10ADCIBAT Register (SMBus address = 24h)
      11. 8.6.11ADCIINCMPIN Register (SMBus address = 25h)
      12. 8.6.12ADCVSYSVBAT Register (SMBus address = 26h) (reset = )
      13. 8.6.13ID Registers
        1. 8.6.13.1ManufactureID Register (SMBus address = FEh) [reset = 0040h]
        2. 8.6.13.2Device ID (DeviceAddress) Register (SMBus address = FFh) [reset = 0h]
  9. Application and Implementation
    1. 9.1Application Information
    2. 9.2Typical Application
      1. 9.2.1Design Requirements
      2. 9.2.2Detailed Design Procedure
        1. 9.2.2.1Input Snubber and Filter for Voltage Spike Damping
        2. 9.2.2.2ACP-ACN Input Filter
        3. 9.2.2.3Inductor Selection
        4. 9.2.2.4Input Capacitor
        5. 9.2.2.5Output Capacitor
        6. 9.2.2.6Power MOSFETs Selection
      3. 9.2.3Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1Layout Guidelines
    2. 11.2Layout Example
      1. 11.2.1Layout Consideration of Current Path
      2. 11.2.2Layout Consideration of Short Circuit Protection
  12. 12器件和文档支持
    1. 12.1器件支持
      1. 12.1.1Third-Party Products Disclaimer
    2. 12.2文档支持
      1. 12.2.1相关文档
    3. 12.3接收文档更新通知
    4. 12.4社区资源
    5. 12.5商标
    6. 12.6静电放电警告
    7. 12.7Glossary
  13. 13机械、封装和可订购信息

特性

  • 从各种输入源为 1 至 4 节电池充电
    • 3.5V 至 24V 输入工作电压
    • 支持 USB 2.0、USB 3.0、USB 3.1 (Type-C) 和 USB_PD 输入电流设置
    • 在降压和升压操作之间进行无缝转换
    • 提供输入电流和电压调节(IDPM 和 VDPM)以防电源过载
  • 用于 CPU 节流的功率/电流监控器
    • 综合 PROCHOT 设置,符合 IMVP8
    • 输入和电池电流监控器
    • 系统功率监控器,符合 IMVP8
  • 窄 VDC (NVDC) 电源路径管理
    • 无需电池或使用深度放电的电池亦可瞬时启动
    • 适配器满载时,电池可为系统补充电量
    • 补电模式下理想的二极管操作
  • 从电池给 USB 端口加电 (USB OTG)
    • 输出 4.48V 至 20.8V 与 USB PD 兼容
    • 输出电流限制高达 6.35A
  • 用于 1µH 至 2.2µH 低剖面电感器的 800kHz 或 1.2MHz 可编程开关频率
  • 柔性系统配置的主机控制接口
    • SMBus (bq25700A) 端口用于优化系统性能和状态报告
    • 硬件引脚设置输入电流限制,无需 EC 控制
  • 高精度调节和监控
    • ±0.5% 充电电压调节
    • ±2% 输入/充电电流调节
    • ±2% 输入/充电电流监控
    • ±5% 功率监控器
  • 安全性
    • 过热保护
    • 输入、系统、电池过电压保护
    • MOSFET 电感过流保护
  • 低电池静态电流
  • 输入电流优化器 (ICO) 可获取最大输入功率
  • 为任意化学电池充电:Li+、LiFePO4、镍镉、镍氢、铅酸
  • 封装:32 引脚 4 x 4 WQFN

应用

  • 超极本、笔记本、可拆卸电脑、平板电脑和移动电源
  • 工业用和医疗用设备
  • 带可充电电池的便携式设备

说明

bq25700A 是一种同步 NVDC 电池降压/升压充电控制器,为空间受限的多种化学电池充电应用提供了组件数量少的高效解决方案 。

NVDC-1 配置可将系统电压稳定在电池电压范围内,但不会低于系统最小电压。即便在电池完全放电或被取出时系统仍继续工作。当负载功率超过输入源额定值时,电池会进入补电模式并防止输入源过载。

bq25700A 从 USB 适配器、高电压 USB PD 源和传统适配器等各种输入源为电池充电。

器件信息 (1)

部件号封装封装尺寸(标称值)
bq25700AWQFN (32) 4.00mm x 4.00mm
  1. 要了解所有可用封装,请参阅数据表末尾的可订购产品附录。

应用图表

bq25700A Simp_schem_SLUSCQ8.gif