JAJSPK3G May   2001  – December 2022 BQ2057C

PRODUCTION DATA  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
  4. 4 Revision History
  5. 5 概要 (続き)
  6. 6 Device Comparison Table
  7. 7 Pin Configuration and Functions
  8. 8 Specifications
    1. 8.1 Absolute Maximum Ratings
    2. 8.2 ESD Ratings
    3. 8.3 Recommended Operating Conditions
    4. 8.4 Thermal Information
    5. 8.5 Electrical Characteristics
    6. 8.6 Typical Characteristics
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Current-Sense Input
      2. 9.3.2 Battery-Voltage Input
      3. 9.3.3 Temperature Sense Input
      4. 9.3.4 Charge-status Output
      5. 9.3.5 Charge-Control Output
      6. 9.3.6 Charge-Rate Compensation Input
      7. 9.3.7 Supply Voltage Input
  10. 10Application and Implementation
    1. 10.1 Application Information
      1. 10.1.1  Functional Description
      2. 10.1.2  Qualification and Precharge
      3. 10.1.3  Current Regulation Phase
      4. 10.1.4  Voltage Regulation Phase
      5. 10.1.5  Charge Termination and Recharge
      6. 10.1.6  Battery Temperature Monitoring
      7. 10.1.7  Charge Inhibit Function
      8. 10.1.8  Charge Status Indication
      9. 10.1.9  Low-power Sleep Mode
      10. 10.1.10 Selecting an External Pass-Transistor
      11. 10.1.11 Selecting Input Capacitor
      12. 10.1.12 Selecting Output Capacitor
      13. 10.1.13 Automatic Charge-rate Compensation
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
      3. 10.2.3 Application Curves
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
      1. 12.1.1 Power FET
      2. 12.1.2 Current Sense
      3. 12.1.3 Voltage Sense
      4. 12.1.4 Enable (TS)
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Device Support
      1. 13.1.1 サード・パーティ製品に関する免責事項
    2. 13.2 ドキュメントの更新通知を受け取る方法
    3. 13.3 サポート・リソース
    4. 13.4 Trademarks
    5. 13.5 静電気放電に関する注意事項
    6. 13.6 用語集
  14. 14Mechanical, Packaging, and Orderable Information

パッケージ・オプション

デバイスごとのパッケージ図は、PDF版データシートをご参照ください。

メカニカル・データ（パッケージ｜ピン）
  • D|8
  • DGK|8
  • PW|8
サーマルパッド・メカニカル・データ
発注情報

10.1.6 Battery Temperature Monitoring

The BQ2057 continuously monitors temperature by measuring the voltage between the TS and VSS pins. A negative- or a positive-temperature coefficient thermistor (NTC, PTC) and an external voltage divider typically develop this voltage. (See Figure 10-9.) The BQ2057 compares this voltage against its internal V(TS1) and V(TS2) thresholds to determine if charging is allowed. (See Figure 10-10.) The temperature sensing circuit is immune to any fluctuation in VCC, since both the external voltage divider and the internal thresholds (V(TS1) and V(TS2)) are referenced to VCC.

The resistor values of R(T1) and R(T2) are calculated by the following equations:

For NTC Thermistors

Equation 3. GUID-8DBD91FE-A01F-413A-9F13-1084600153E4-low.gif
Equation 4. GUID-8DBD91FE-A01F-413A-9F13-1084600153E4-low.gif

For PTC Thermistors

Equation 5. GUID-B966243B-F3D5-4B2E-8542-03857F8EBC7C-low.gif
Equation 6. GUID-B118CCFC-9A26-4ABA-8A9F-3E214B708D8C-low.gif

Where R(TC) is the cold temperature resistance and R(TH) is the hot temperature resistance of thermistor, as specified by the thermistor manufacturer.

RT1 or RT2 can be omitted If only one temperature (hot or cold) setting is required. Applying a voltage between the V(TS1) and V(TS2) thresholds to pin TS disables the temperature-sensing feature.

GUID-20220527-SS0I-9CM3-HGSD-180FL1VPX3KP-low.gif Figure 10-9 Temperature Sensing Circuits
GUID-20220527-SS0I-H2SR-9HCS-WQV6MKDCS0L4-low.gif Figure 10-10 BQ2057 TS Input Thresholds