ZHCSMW0 October   2021 BQ25170J

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Timing Requirements
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Device Power Up from Input Source
        1. 7.3.1.1 ISET Pin Detection
        2. 7.3.1.2 VSET Pin Detection
        3. 7.3.1.3 Charger Power Up
      2. 7.3.2 Battery Charging Features
        1. 7.3.2.1 Lithium-Ion Battery Charging Profile
        2. 7.3.2.2 Charge Termination and Battery Recharge
        3. 7.3.2.3 Charging Safety Timers
        4. 7.3.2.4 Battery Temperature Qualification (TS Pin)
      3. 7.3.3 Status Outputs ( PG, STAT)
        1. 7.3.3.1 Power Good Indicator (PG Pin)
        2. 7.3.3.2 Charging Status Indicator (STAT)
      4. 7.3.4 Protection Features
        1. 7.3.4.1 Input Overvoltage Protection (VIN OVP)
        2. 7.3.4.2 Output Overvoltage Protection (BAT OVP)
        3. 7.3.4.3 Output Overcurrent Protection (BAT OCP)
        4. 7.3.4.4 Thermal Regulation and Thermal Shutdown (TREG and TSHUT)
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown or Undervoltage Lockout (UVLO)
      2. 7.4.2 Sleep Mode
      3. 7.4.3 Active Mode
        1. 7.4.3.1 Standby Mode
      4. 7.4.4 Fault Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Li-Ion Charger Design Example
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 第三方产品免责声明
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 支持资源
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 术语表
  12. 12Mechanical, Packaging, and Orderable Information

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

7.3.2.4 Battery Temperature Qualification (TS Pin)

While charging, the device continuously monitors battery temperature by sensing the voltage at the TS pin. A negative temperature coefficient (NTC) thermistor should be connected between the TS and GND pins (recommend: 103AT-2). If temperature sensing is not required in the application, connect a fixed 10-kΩ resistor from TS to GND to allow normal operation.

The TS function for BQ25170J is designed to follow the JEITA temperature standard for Li-Ion and Li-Poly batteries; charge current (ISET) and regulation voltage (VREG) are reduced based on battery temp (TS). There are four thresholds, Hot-55C, Warm-45C, Cool-10C and Cold-0C.

Normal operation occurs between 10C and 45C, charge current and voltage will be the normal values. When battery is in the Cool temperature range, between 0C and 10C, the charger current level is 20% of ISET value and regulation voltage is not changed. When the battery is in the Warm temperature range, between 45C and 55C, ISET is reduced by 50% and regulation voltage is reduced to 4.1V for VSET settings greater than 4.1V. Regulation voltage is not reduced during the Warm region for VSET settings less than or equal to 4.1V. Charge is suspended below Cold temp of 0C and above Hot temp of 55C. When charge is suspended device enters the STANDBY state, and blinks the STAT pin. Once battery temperature returns to normal conditions, charging resumes automatically. See Figure 7-3.

When charge current is reduced during Cool or Warm temp the safety timer runs at half the clock rate.

GUID-20210930-SS0I-DJBS-WQN5-2TJ91WSMS9P9-low.pngFigure 7-3 Standard JEITA Profile figure

In addition to battery temperature sensing, the TS pin can be used to disable the charger at any time by pulling TS voltage below VTS_ENZ. The device disables the charger and consumes ISD_IN_TS from the input supply. In order to minimize quiescent current, the TS current source (ITS_BIAS) is duty-cycled, with an on-time of tTS_DUTY_ON and an off time of tTS_DUTY_OFF. After the TS pin pull-down is released, the device may take up to tTS_DUTY_OFF to turn the ITS_BIAS back on. After the source is turned on, the TS pin voltage will go above VTS_EN, and re-enable the charger operation. The device treats this TS pin toggle as an input supply toggle, triggering Device Power Up From Input Source (Section 7.3.1).