SLUSFQ8B December   2024  – June 2025 BQ2969T

PRODMIX  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 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 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Pin Details
        1. 7.3.1.1 Input Sense Voltage, Vx
        2. 7.3.1.2 Output Drive, OUT
        3. 7.3.1.3 Supply Input, VDD
        4. 7.3.1.4 Control / PTC Input Pin, CTL
        5. 7.3.1.5 Regulated Supply Output, REG
      2. 7.3.2 Overvoltage Sensing for OUT
      3. 7.3.3 Regulator Output Voltage
    4. 7.4 Device Functional Modes
      1. 7.4.1 NORMAL Mode
      2. 7.4.2 OVERVOLTAGE Mode
      3. 7.4.3 UNDERVOLTAGE Mode
      4. 7.4.4 CTL / OVERTEMPERATURE Mode
      5. 7.4.5 CUSTOMER TEST MODE
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
      4. 8.2.4 CTL for PTC Thermistor Protection
      5. 8.2.5 CTL for External OUT Overdrive
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Third-Party Products Disclaimer
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

3 Description

The BQ2969T family is a high-accuracy, low-power overvoltage protector with a 3mA regulated output supply and control / PTC input for Li-ion and LiFePO4 (LFP) battery pack applications.

Each cell in a 2-series to 4-series cell stack is individually monitored for an overvoltage condition. An internal fixed-delay timer is initiated upon detection of an overvoltage condition on any cell. Upon expiration of the delay timer, the output pin is triggered into an active state to indicate that an overvoltage condition has occurred.

The regulated output supply delivers up to 3mA output current to drive always-on circuits, such as a real-time clock (RTC) oscillator. The BQ2969T family has a self-disable function to turn off the regulated output if any cell voltage falls below a programmable undervoltage threshold, thereby preventing drain on the battery.

The BQ2969T family includes a CTL pin which can be used to assert the OUT pin upon demand. The device also supports overtemperature (OT) protection when a PTC thermistor is attached between the CTL and VDD pins on the device.

The BQ2969T family provides exceptionally low power operation, drawing only 1.23μA during normal operation (excluding regulator load current), and dropping to 0.25uA when in an undervoltage condition. Even when in the undervoltage state, the device can still detect an overvoltage condition on any other cell (which can occur in an imbalanced pack) and can assert the output pin.

Package Information
PART NUMBER(1)PACKAGE(2)PACKAGE SIZE(3)
BQ2969xxTDSG (WSON, 8)2.00mm × 2.00mm
(2) For more information, see Section 11.
(3) The package size (length × width) is a nominal value and includes pins, where applicable.
BQ2969T Simplified DiagramSimplified Diagram