Lithium-Ion Battery Monitor and Secondary Protection IC for Electric and Hybrid Electric Vehicle - BQ76PL536

BQ76PL536 (NRND)

Lithium-Ion Battery Monitor and Secondary Protection IC for Electric and Hybrid Electric Vehicle

Not Recommended for New Designs (NRND)

Replaced By BQ76PL536A – The device has the SAME FUNCTIONALITY and PINOUT as the compared device but is NOT an exact equivalent. The bq76PL536 is not recommended for new designs. The bq76PL536A is an pin and function compatible device which offers improved communications functionality, noise immunity, and ADC performance. TI strongly recommends that design engineers consider the bq76PL536A for all new designs  

TI does not recommend using this part in a new design. This product continues to be in production to support existing customers.

Description

The bq76PL536 is a stackable three to six series cell lithium-ion battery pack protector and analog front end (AFE) that incorporates a precision analog-to-digital converter (ADC); independent cell voltage and temperature protection; cell balancing, and a precision 5-V regulator to power user circuitry.

The bq76PL536 integrates a voltage translation and precision analog-to-digital converter system to measure battery cell voltages with high accuracy and speed.

The bq76PL536 provides full protection (secondary protection) for overvoltage, undervoltage, and overtemperature conditions. When safety thresholds are exceeded, the bq76PL536 sets the FAULT output. No external components are needed to configure or enable the protection features.

Cell voltage and temperature protection functions are independent of the ADC system. Programmable protection thresholds and detection delay times are stored in Error Check/Correct (ECC) OTP EPROM, which increases the flexibility and reliability of the battery management system.

The bq76PL536 is intended to be used with a host controller to maximize the functionality of the battery management system. However, the protection functions do not require a host controller.

The bq76PL536 can be stacked vertically to monitor up to 192 cells without additional isolation components between ICs. A high-speed serial peripheral interface (SPI) bus operates between each bq76PL536 to provide reliable communications through a high-voltage battery cell stack.

The host microcontroller controls cell balancing of individual cells by setting the registers (via SPI) which control the appropriate CBx outputs. These outputs can be turned off via the same control, or automatically by the internal programmable safety timer. The balancing bypass current is set via an external series resistor and FET.

Features

  • 3 to 6 Series Cell Support, All Chemistries
  • Hot-Pluggable
  • High-Speed SPI for Data Communications
  • Stackable Vertical Interface
  • No Isolation Components Required Between ICs
  • Industrial Temperature Range, –40°C to 85°C
  • High-Accuracy Analog-to-Digital Converter (ADC):
    • ±3 mV Typical accuracy
    • 14-Bit Resolution, 6-µs Conversion Time
    • Nine ADC Inputs: 6 Cell Voltages, 1 Six-Cell Brick Voltage,
      2 Temperatures, 1 General-Purpose Input
    • Dedicated Pins for Synchronizing Measurements
  • Configuration Data Stored in ECC-OTP Registers
  • Built-In Comparators (Secondary Protector) for:
    • Over- and Undervoltage Protection
    • Overtemperature Protection
    • Programmable Thresholds and Delay Times
    • Dedicated Fault Output Signals for OV, UV, OT
  • Cell Balancing Control Outputs With Safety Timeout
    • Balance Current Set by External Components
  • Supply Voltage Range from 6 V to 30 V Continuous and 36 V Peak
  • Low Power:
    • Typical 12-µA Sleep, 45-µA Idle
  • Integrated Precision 5-V, 3-mA LDO
  • APPLICATIONS
    • Uninterruptible Power Systems (UPS)
    • E-Bike and E-Scooter
    • Large-Format Battery Systems
    • Electric and Hybrid Electric Vehicles

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Other qualified versions of BQ76PL536

Version Part Number Definition
Automotive BQ76PL536-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects

Companion parts

Part # Name Product Family Comments
ISO7220A   Dual Channel, 2/0, 1Mbps Digital Isolator   ISOLATOR - Digital Isolator    TI recommends design engineers consider the ISO7220A for isolating communication lines from battery  
ISO1050   Isolated 5-V CAN Transceivers   ISOLATOR - Isolated CAN Transceivers    TI recommends design engineers consider the ISO1050 for isolating CAN bus from battery  
INA148   +-200V Common-Mode Voltage Difference Amplifier   AMPLIFIERS AND LINEAR - DIFFERENCE AMPLIFIER    TI recommends design engineers consider the INA148 for measuring current in the battery pack  
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