Product details

Function Protection Number of series cells (Min) 3, 4, 5 Number of series cells (Max) 4, 5 Features Overvoltage, Undervoltage, Overcurrent during charge (OCC), Overcurrent during discharge (OCD), Short-circuit Discharge (SCD), Open wire (OW), Over-temperature (OT), Under-temperature (UT), Stackable, Cell balancing, FET drive Typical operating current (Typ) (uA) 8 Rating Catalog Vin (Max) (V) 25 TI functional safety category Functional Safety-Capable
Function Protection Number of series cells (Min) 3, 4, 5 Number of series cells (Max) 4, 5 Features Overvoltage, Undervoltage, Overcurrent during charge (OCC), Overcurrent during discharge (OCD), Short-circuit Discharge (SCD), Open wire (OW), Over-temperature (OT), Under-temperature (UT), Stackable, Cell balancing, FET drive Typical operating current (Typ) (uA) 8 Rating Catalog Vin (Max) (V) 25 TI functional safety category Functional Safety-Capable
TSSOP (PW) 24 34 mm² 7.7 x 4.4
  • Ultra-low quiescent current: 8 µA typ. (NORMAL mode), 2 µA (HIBERNATE mode)
  • Full suite of voltage, current, and temperature protections
  • Smart passive cell balancing removes cell-to-cell imbalance
  • Scalable cell count from 3 series to 20 series or more
  • Voltage protection (accuracy ±10 mV for OV, ±18 mV for UV)
    • Overvoltage: 3 V to 4.575 V
    • Undervoltage: 1.2 V to 3 V
  • Open cell and open-wire detection (OW)
  • Current protection
    • Overcurrent discharge 1: –10 mV to –85 mV
    • Overcurrent discharge 2: –20 mV to –170 mV
    • Short-circuit discharge: –40 mV to –340 mV
  • Temperature protection
    • Overtemperature charge: 45°C or 50°C
    • Overtemperature discharge: 65°C or 70°C
  • Additional features:
    • Independent charge (CHG) and discharge (DSG) FET drivers
    • Smart cell balancing algorithm with integrated FETs (up to 50-mA balancing current), also supports external FETs for higher cell-balancing current
    • Ultra-low power HIBERNATE mode
    • High 36-V absolute maximum rating per cell input
    • Resistor programmable overcurrent (OCD1/2) delay
  • SHUTDOWN mode: 0.5-µA maximum
  • Functional Safety-Capable
  • Ultra-low quiescent current: 8 µA typ. (NORMAL mode), 2 µA (HIBERNATE mode)
  • Full suite of voltage, current, and temperature protections
  • Smart passive cell balancing removes cell-to-cell imbalance
  • Scalable cell count from 3 series to 20 series or more
  • Voltage protection (accuracy ±10 mV for OV, ±18 mV for UV)
    • Overvoltage: 3 V to 4.575 V
    • Undervoltage: 1.2 V to 3 V
  • Open cell and open-wire detection (OW)
  • Current protection
    • Overcurrent discharge 1: –10 mV to –85 mV
    • Overcurrent discharge 2: –20 mV to –170 mV
    • Short-circuit discharge: –40 mV to –340 mV
  • Temperature protection
    • Overtemperature charge: 45°C or 50°C
    • Overtemperature discharge: 65°C or 70°C
  • Additional features:
    • Independent charge (CHG) and discharge (DSG) FET drivers
    • Smart cell balancing algorithm with integrated FETs (up to 50-mA balancing current), also supports external FETs for higher cell-balancing current
    • Ultra-low power HIBERNATE mode
    • High 36-V absolute maximum rating per cell input
    • Resistor programmable overcurrent (OCD1/2) delay
  • SHUTDOWN mode: 0.5-µA maximum
  • Functional Safety-Capable

The BQ77915 device is a low-power battery pack protector that implements a suite of voltage, current, and temperature protections and a smart cell balancing algorithm without microcontroller (MCU) control. The device’s stackable interface provides simple scaling to support battery cell applications from 3 series to 20 series or more. Protection thresholds and delays are factory-programmed and available in a variety of configurations. Separate overtemperature and undertemperature thresholds for discharge (OTD and UTD) and charge (OTC and UTC) are provided for added flexibility.

The BQ77915 device is a low-power battery pack protector that implements a suite of voltage, current, and temperature protections and a smart cell balancing algorithm without microcontroller (MCU) control. The device’s stackable interface provides simple scaling to support battery cell applications from 3 series to 20 series or more. Protection thresholds and delays are factory-programmed and available in a variety of configurations. Separate overtemperature and undertemperature thresholds for discharge (OTD and UTD) and charge (OTC and UTC) are provided for added flexibility.

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Technical documentation

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Type Title Date
* Data sheet BQ77915 3-Series to 5-Series Stackable Ultra-Low Power Primary Protector with Autonomous Cell Balancing and HIBERNATE Mode datasheet (Rev. I) 15 Sep 2020
Application note BQ77915 Function Safety Capable 07 Sep 2020
Application note Stacking Implementations with bq77915 (Rev. A) 27 Aug 2020
E-book Ein Techniker-Leitfaden für Industrieroboter-Designs 25 Mar 2020
E-book E-book: An engineer’s guide to industrial robot designs 12 Feb 2020
User guide bq77915 3-Series to 5-Series Low-Power Protector Evaluation Module User's Guide (Rev. B) 21 Aug 2018
Application note High Side Charge FET Implementation 23 Jul 2018
Application note Bq77905 Using Multiple FETs 15 Jul 2016
Application note bq77905 Separate Current Paths (Rev. A) 07 Jul 2016

Design & development

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Evaluation board

BQ77915EVM-014 — BQ77915 3-series to 5-series stackable ultra-low-power primary protector evaluation module

The BQ77915EVM-014 evaluation module (EVM) is a complete evaluation system for the BQ77915 3-series to 5-series low-power protector for lithium-ion cells. The EVM includes one BQ77915 and FETs to control current in a configuration typical for switching current in a lithium-ion battery pack. The (...)

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Reference designs

PMP40441 — Multi-cell buck-boost battery charger system reference design for USB PD PPS

This reference design is for USB Power Delivery (PD) battery charging applications, such as power banks or other portable devices. It employs the Buck-Boost charger BQ25713 for a wide input and output range for USB PD charging. The USB PD controller card (PMP40442) can configure the charger to run (...)
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