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BQ77PL900

ACTIVE

5-10 cell Li-ion Battery protection & AFE

Product details

Number of series cells (min) 5 Number of series cells (max) 10 Features Cell balancing, FET drive, I2C support, Integrated ADC, LDO output, Multi-cell support, Overvoltage protection, Separate MCU requirement, Temperature sensing, Undervoltage protection Operating current (typ) (µA) 450 Rating Catalog Vin (max) (V) 50 Operating temperature range (°C) -40 to 100 Battery overvoltage protection (min) (V) 4.15 Battery overvoltage protection (max) (V) 4.5
Number of series cells (min) 5 Number of series cells (max) 10 Features Cell balancing, FET drive, I2C support, Integrated ADC, LDO output, Multi-cell support, Overvoltage protection, Separate MCU requirement, Temperature sensing, Undervoltage protection Operating current (typ) (µA) 450 Rating Catalog Vin (max) (V) 50 Operating temperature range (°C) -40 to 100 Battery overvoltage protection (min) (V) 4.15 Battery overvoltage protection (max) (V) 4.5
SSOP (DL) 48 164.358 mm² 15.88 x 10.35
  • 5, 6, 7, 8, 9, or 10 Series-Cell Primary Protection
  • PMOS FET Drive for Charge and Discharge FETs
  • Capable of Operation with 1-m Sense Resistor
  • Supply Voltage Range from 7 V to 50 V
  • Low Supply Current of 450 µA Typical
  • Integrated 5 V 25-mA LDO
  • Integrated 3.3 V 25-mA LDO
  • Stand-Alone Mode
    • Pack Protection Control and Recovery
    • Individual Cell Monitoring
    • Integrated Cell Balancing
    • Programmable Threshold and Delay Time for OvervoltageUndervoltage Overcurrent in Discharge Short Circuit in Discharge
    • Fixed Overtemperature Protection
  • Host Control Mode
    • I2C Interface to Host Controller
    • Analog Interface for Host Cell Measurement and System Charge/Discharge Current
    • Host-Controlled Protection Recovery
    • Host-Controlled Cell Balancing
  • APPLICATIONS
    • Cordless Power Tools
    • Power Assisted Bicycle/Scooter
    • Uninterruptible Power Supply (UPS) Systems
    • Medical Equipment
    • Portable Test Equipment

  • 5, 6, 7, 8, 9, or 10 Series-Cell Primary Protection
  • PMOS FET Drive for Charge and Discharge FETs
  • Capable of Operation with 1-m Sense Resistor
  • Supply Voltage Range from 7 V to 50 V
  • Low Supply Current of 450 µA Typical
  • Integrated 5 V 25-mA LDO
  • Integrated 3.3 V 25-mA LDO
  • Stand-Alone Mode
    • Pack Protection Control and Recovery
    • Individual Cell Monitoring
    • Integrated Cell Balancing
    • Programmable Threshold and Delay Time for OvervoltageUndervoltage Overcurrent in Discharge Short Circuit in Discharge
    • Fixed Overtemperature Protection
  • Host Control Mode
    • I2C Interface to Host Controller
    • Analog Interface for Host Cell Measurement and System Charge/Discharge Current
    • Host-Controlled Protection Recovery
    • Host-Controlled Cell Balancing
  • APPLICATIONS
    • Cordless Power Tools
    • Power Assisted Bicycle/Scooter
    • Uninterruptible Power Supply (UPS) Systems
    • Medical Equipment
    • Portable Test Equipment

The bq77PL900 is a five to ten series cell lithium-ion battery pack protector. The integrated I2C communications interface allows the bq77PL900 also to be as an analog front end (AFE) for a Host controller. Two LDOs, one 5 V/25 mA and one 3.3 V/25 mA, are also included and may be used to power a host controller or support circuitry.

The bq77PL900 integrates a voltage translation system to extract battery parameters such as individual cell voltages and charge/discharge current. Variables such as voltage protection thresholds and detection delay times can be programmed by using the internal EEPROM.

The bq77PL900 can act as a stand-alone self-contained battery protection system (stand-alone mode). It can alternatively be combined with a host microcontroller to offer fuel gauge or other battery management capabilities to the host system (host-control mode).

The bq77PL900 provides full safety protection for overvoltage, undervoltage, overcurrent in discharge, and short circuit in discharge conditions. When the EEPROM programmable safety thresholds are reached, the bq77PL900 turns off the FET drive autonomously. No external components are needed to configure the protection features.

The analog front end (AFE) outputs allow a host controller to observe individual cell voltages and charge/discharge currents. The host controller's analog-to-digital converter connects to the bq77PL900 to acquire these values.

Cell balancing can be performed autonomously, or the host controller can activate it individually via a cell bypass path integrated into the bq77PL900. Internal control registers accessible via the I2C interface configure this operation. The maximum balancing bypass current is set via an external series resistor and the internal FET-on resistance (typically 400 ). Optionally, external bypass cell balance FETs can be used for increased current capability.

The bq77PL900 is a five to ten series cell lithium-ion battery pack protector. The integrated I2C communications interface allows the bq77PL900 also to be as an analog front end (AFE) for a Host controller. Two LDOs, one 5 V/25 mA and one 3.3 V/25 mA, are also included and may be used to power a host controller or support circuitry.

The bq77PL900 integrates a voltage translation system to extract battery parameters such as individual cell voltages and charge/discharge current. Variables such as voltage protection thresholds and detection delay times can be programmed by using the internal EEPROM.

The bq77PL900 can act as a stand-alone self-contained battery protection system (stand-alone mode). It can alternatively be combined with a host microcontroller to offer fuel gauge or other battery management capabilities to the host system (host-control mode).

The bq77PL900 provides full safety protection for overvoltage, undervoltage, overcurrent in discharge, and short circuit in discharge conditions. When the EEPROM programmable safety thresholds are reached, the bq77PL900 turns off the FET drive autonomously. No external components are needed to configure the protection features.

The analog front end (AFE) outputs allow a host controller to observe individual cell voltages and charge/discharge currents. The host controller's analog-to-digital converter connects to the bq77PL900 to acquire these values.

Cell balancing can be performed autonomously, or the host controller can activate it individually via a cell bypass path integrated into the bq77PL900. Internal control registers accessible via the I2C interface configure this operation. The maximum balancing bypass current is set via an external series resistor and the internal FET-on resistance (typically 400 ). Optionally, external bypass cell balance FETs can be used for increased current capability.

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Technical documentation

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Type Title Date
* Data sheet 5-10 cell Li-ion Battery protection & AFE datasheet (Rev. B) 03 Dec 2008
EVM User's guide bq77PL900EVM-001 (Rev. B) 06 Mar 2018
Analog Design Journal Cell balancing buys extra run time and battery life 11 Mar 2009
Application note Cell Balancing with the bq77PL900 03 Jul 2008

Design & development

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Support software

SLUC103 bq77PL900 EVSW Install v1p0p0

Supported products & hardware

Supported products & hardware

Products
Battery protectors
BQ77PL900 5-10 cell Li-ion Battery protection & AFE
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SSOP (DL) 48 View options

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