SLUSBU9D March 2014  – May 2016

UNLESS OTHERWISE NOTED, this document contains PRODUCTION DATA. 

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Device Configurations
  6. Pin Configuration and Functions
    1. 6.1Pin Descriptions
      1. 6.1.1Supply Input: BAT
      2. 6.1.2Cell Negative Connection: VSS
      3. 6.1.3Voltage Sense Node: V-
      4. 6.1.4Discharge FET Gate Drive Output: DOUT
      5. 6.1.5Charge FET Gate Drive Output: COUT
  7. Specifications
    1. 7.1Absolute Maximum Ratings
    2. 7.2ESD Ratings
    3. 7.3Recommended Operating Conditions
    4. 7.4Thermal Information
    5. 7.5DC Characteristics
    6. 7.6Programmable Fault Detection Thresholds
    7. 7.7Programmable Fault Detection Timer Ranges
    8. 7.8Typical Characteristics
  8. Parameter Measurement Information
    1. 8.1Timing Charts
    2. 8.2Test Circuits
    3. 8.3Test Circuit Diagrams
  9. Detailed Description
    1. 9.1Overview
    2. 9.2Functional Block Diagram
    3. 9.3Feature Description
    4. 9.4Device Functional Modes
      1. 9.4.1Normal Operation
      2. 9.4.2Overcharge Status
      3. 9.4.3Over-Discharge Status
      4. 9.4.4Discharge Overcurrent Status (Discharge Overcurrent, Load Short-Circuit)
      5. 9.4.5Charge Overcurrent Status
      6. 9.4.60-V Charging Function (Available)
      7. 9.4.70-V Charging Function (Unavailable)
      8. 9.4.8Delay Circuit
  10. 10Applications and Implementation
    1. 10.1Application Information
    2. 10.2Typical Application
      1. 10.2.1Design Requirements
      2. 10.2.2Detailed Design Procedure
      3. 10.2.3Application Performance Plots
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1Layout Guidelines
    2. 12.2Layout Example
  13. 13Device and Documentation Support
    1. 13.1Related Links
    2. 13.2Community Resources
    3. 13.3Trademarks
    4. 13.4Electrostatic Discharge Caution
    5. 13.5Glossary
  14. 14Mechanical, Packaging, and Orderable Information

1 Features

  • Input Voltage Range Pack+: VSS – 0.3 V to 12 V
  • FET Drive:
    • CHG and DSG FET Drive Output
  • Voltage Sensing Across External FETs for Overcurrent Protection (OCP) Is Within ±5 mV (Typical)
  • Fault Detection
    • Overcharge Detection (OVP)
    • Over-Discharge Detection (UVP)
    • Charge Overcurrent Detection (OCC)
    • Discharge Overcurrent Detection (OCD)
    • Load Short-Circuit Detection (SCP)
  • Zero Voltage Charging for Depleted Battery
  • Factory Programmed Fault Protection Thresholds
    • Fault Detection Voltage Thresholds
    • Fault Trigger Timers
    • Fault Recovery Timers
  • Modes of Operation Without Battery Charger Enabled
    • NORMAL Mode ICC = 4 µA
    • Shutdown Iq = 100 nA
  • Operating Temperature Range TA = –40°C to +85°C
  • Package:
    • 6-Pin DSE (1.50 mm × 1.50 mm × 0.75 mm)

2 Applications

  • Tablet PC
  • Mobile Handset
  • Handheld Data Terminals

3 Description

The bq2970 battery cell protection device provides an accurate monitor and trigger threshold for overcurrent protection during high discharge/charge current operation or battery overcharge conditions.

The bq2970 device provides the protection functions for Li-Ion/Li-Polymer cells, and monitors across the external power FETs for protection due to high charge or discharge currents. In addition, there is overcharge and depleted battery monitoring and protection. These features are implemented with low current consumption in NORMAL mode operation.

Device Information(1)

PART NUMBER PACKAGEBODY SIZE (NOM)
bq2970, bq2971, bq2972, bq2973 (2)WSON (6) 1.50 mm × 1.50 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.
  2. For available released devices, see the Released Device Configurations table.

Simplified Schematic

bq2970 bq2971 bq2972 bq2973 SimpSchematic.gif

OCD Detection Accuracy Versus Temperature

bq2970 bq2971 bq2972 bq2973 C012_OCD_DET_ACC_SLUSBU9.png