ZHCSFK5 October   2016

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 修订历史记录
  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. 7 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
      1. 8.1.1 Device Protection Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Device Power Up
      2. 8.3.2 Battery Switch (Q1 + Q2)
      3. 8.3.3 Integrated 10-bit ADC for Monitoring
      4. 8.3.4 Linear Regulation Mode (LDO)
      5. 8.3.5 Protection Features
        1. 8.3.5.1 Reverse Current Protection (RCP)
        2. 8.3.5.2 Internal Thermal Shutdown
        3. 8.3.5.3 Input Overvoltage Protection
          1. 8.3.5.3.1 OVPSET pin
        4. 8.3.5.4 IBUS and VBUS Protection
        5. 8.3.5.5 IBAT and VBAT Protection
        6. 8.3.5.6 VOUT Protection
        7. 8.3.5.7 VDROP Protection
        8. 8.3.5.8 VBUS Temperature (TS_BUS_FLT) and Battery Temperature (TS_BAT_FLT)
      6. 8.3.6 I2C Serial Interface
        1. 8.3.6.1 Data Validity
        2. 8.3.6.2 START and STOP Conditions
        3. 8.3.6.3 Byte Format
        4. 8.3.6.4 Acknowledge (ACK) and Not Acknowledge (NACK)
        5. 8.3.6.5 Slave Address and Data Direction bit
        6. 8.3.6.6 Multi-Read and Multi-Write
    4. 8.4 Device Functional Modes
    5. 8.5 I2C Register Maps
      1. 8.5.1  I2C Register Summary Table
      2. 8.5.2  REG00 (DEVICE_INFO)
      3. 8.5.3  REG01 (EVENT_1_MASK)
      4. 8.5.4  REG02 (EVENT_2_MASK)
      5. 8.5.5  REG03 (EVENT_1)
      6. 8.5.6  REG04 (EVENT_2)
      7. 8.5.7  REG05 (EVENT_1_EN)
      8. 8.5.8  REG06 (CONTROL)
      9. 8.5.9  REG07 (ADC_CONTROL)
      10. 8.5.10 REG08 (ADC_EN)
      11. 8.5.11 REG09 (PROTECTION)
      12. 8.5.12 REG0A (VBUS_OVP)
      13. 8.5.13 REG0B (VOUT_REG)
      14. 8.5.14 REG0C (VDROP_OVP)
      15. 8.5.15 REG0D (VDROP_ALM)
      16. 8.5.16 REG0E (VBAT_REG)
      17. 8.5.17 REG0F (IBAT_REG)
      18. 8.5.18 REG10 (IBUS_REG)
      19. 8.5.19 REG11 (TS_BUS_FLT)
      20. 8.5.20 REG12 (TS_BAT_FLT)
      21. 8.5.21 REG 13 and REG 14 (VBUS_ADC)
      22. 8.5.22 REG15 and REG16 (IBUS_ADC)
      23. 8.5.23 REG17 and REG18 (VOUT_ADC)
      24. 8.5.24 REG19 and REG1A (VDROP_ADC)
      25. 8.5.25 REG1B and REG1C (VBAT_ADC)
      26. 8.5.26 REG1D and REG1E (IBAT_ADC)
      27. 8.5.27 REG1F and REG20 (TS_BUS_ADC)
      28. 8.5.28 REG21 and REG22 (TS_BAT_ADC)
      29. 8.5.29 REG 23 (TDIE_ADC)
      30. 8.5.30 REG 24 (EVENT_2_EN)
      31. 8.5.31 REG 25 (EVENT_3_MASK)
      32. 8.5.32 REG 26 (EVENT_3)
      33. 8.5.33 REG27 and REG28 (VUSB_ADC)
      34. 8.5.34 REG 29 (CONTROL_2)
      35. 8.5.35 REG 40 (DIE_TEMP_FLT)
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12器件和文档支持
    1. 12.1 接收文档更新通知
    2. 12.2 社区资源
    3. 12.3 商标
    4. 12.4 静电放电警告
    5. 12.5 Glossary
  13. 13机械、封装和可订购信息

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

9 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.

9.1 Application Information

A typical application consists of the device configured as an I2C controlled device and another switch mode charger for Li-Ion and Li-polymer batteries used in a wide range of smart phones and other portable devices. A host controls which charger is enabled during the charging process.

9.2 Typical Application

bq25872 tyapp_luscn1_872.gif Figure 55. bq25872 Typical Application

9.2.1 Design Requirements

Table 37. Design Requirement

PARAMETER VALUE
Input voltage range 3 V to 6 V
Input current limit 0.1 A to 7.5 A
Output voltage range 3 V to 4.975 V

9.2.2 Detailed Design Procedure

The bq25872 continuously monitors battery and adaptor connector temperature by measuring the voltage between TS_BAT pin and TS_BUS pins and ground, typically determined by a negative temperature coefficient thermistor and an external voltage divider. The device compares this voltage against its internal thresholds to determine if charging is allowed. To initiate a charging cycle, both battery and connector temperatures must be lower than the temperature threshold, else the device suspends charging and waits until both temperatures are blow the threshold.

Assuming a 103 AT NTC thermistor is used on the battery pack, the values RT1 (connected between TS_X pin to VREF) and RT2 (connected between TS_X and ground) can be determined by using the following equations.

Equation 1. bq25872 qu1_new_luscn1.gif

where

  • RTHcold and VLTF are the resistance of NTC under the cold temperature and the corresponding TS_X pin voltage when charge is allowed, RTHhot and VTCOare the resistance of NTC under the hot temperature and the corresponding TS_X pin voltage when charge is allowed.

9.2.3 Application Curves

bq25872 apc1_luscn1.gif
Figure 56. Power Up with IBUS_REG = 1 A
bq25872 apc3_luscn1.gif
1.
Figure 58. VBAT Regulation During Load Step Down
bq25872 apc5_luscn1.gif
1.
Figure 60. TS BUS OTP
bq25872 apc_pu_872_luscn1.gif
Figure 62. Power Up of bq25872
bq25872 apc2_luscn1.gif
Figure 57. IBAT Regulation During Load Step Down
bq25872 apc4_luscn1.gif
1.
Figure 59. IBUS OCP During Load Transient
bq25872 apc6_luscn1.gif
1.
Figure 61. VBUS OVP with IBUS Regulation