3-Series to 5-Series Stackable Ultra-Low-Power Primary Protector With Autonomous Cell Balancing


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 open-in-new Find other Battery protectors

Package | Pins | Size

TSSOP (PW) 24 34 mm² 7.7 x 4.4 open-in-new Find other Battery protectors


  • 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
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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) Sep. 15, 2020
Application note BQ77915 Function Safety Capable Sep. 07, 2020
Application note Stacking Implementations with bq77915 (Rev. A) Aug. 27, 2020
E-book Ein Techniker-Leitfaden für Industrieroboter-Designs Mar. 25, 2020
E-book E-book: An engineer’s guide to industrial robot designs Feb. 12, 2020
User guide bq77915 3-Series to 5-Series Low-Power Protector Evaluation Module User's Guide (Rev. B) Aug. 21, 2018
Application note High Side Charge FET Implementation Jul. 23, 2018
Application note Bq77905 Using Multiple FETs Jul. 15, 2016
Application note bq77905 Separate Current Paths (Rev. A) Jul. 07, 2016

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide

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 (...)

  • 3-series to 5-series lithium-ion protector with full suite of V/I/T protection functions
  • Low power consumption (8 µA typ in normal mode, 2 µA typ in hibernate mode)
  • Autonomous smart cell balancing
  • FETs to demonstrate current control
  • Tested circuit design includes demo and Getting Started guide

Reference designs

Multi-cell buck-boost battery charger system reference design for USB PD PPS
PMP40441 — 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 (...)
document-generic Schematic

CAD/CAE symbols

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