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Product details

Parameters

Function Protection Number of series cells (Min) 3 Number of series cells (Max) 5 Communication interface No Communication Features Analog current sense, Low-Side NCH CHG/DSG FET Drive, Programmable EEPROM or EPROM, Stackable (built-in interface), Temperature sense, Open wire detection, Over-current in Discharge (OCD), Over-temperature (OT), Over-voltage (OV), Short-circuit Discharge (SCD), Under-temperature (UT), Under-voltage (UV), Cell Balancing Typical operating current (Typ) (uA) 8 Rating Catalog Vin (Max) (V) 25 Approx. price (US$) 0.62 | 1ku 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

Features

  • 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

All trademarks are the property of their respective owners.

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Description

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 device achieves pack protection via the integrated independent CHG and DSG low-side NMOS FET drivers, which may be disabled through two control pins. These control pins may also be used to achieve cell protection solutions for higher series (6 series and beyond) in a simple and economical manner. To do this, simply cascade a higher device CHG and DSG outputs to the immediate lower device control pins. For added flexibility, discharge overcurrent protection delays can be programmed using a resistor connected from the OCDP pin to VSS.

The BQ77915 protector achieves a smart passive cell-balancing algorithm via integrated FETs for cell balancing currents up to 50 mA. For higher cell-balancing current requirements, external FETs can be connected. A HIBERNATE mode intended for shipping and storage of the battery packs enables ultra-low power operation.

The BQ77915 protector is intended for battery packs where no host monitoring is required.

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Technical documentation

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Type Title Date
* Datasheet BQ77915 3-Series to 5-Series Stackable Ultra-Low Power Primary Protector with Autonomous Cell Balancing and HIBERNATE Mode datasheet (Rev. G) Dec. 30, 2019
More literature Ein Techniker-Leitfaden für Industrieroboter-Designs Mar. 25, 2020
User guides bq77915 3-Series to 5-Series Low-Power Protector Evaluation Module User's Guide (Rev. B) Aug. 21, 2018
Application notes High Side Charge FET Implementation Jul. 23, 2018
Application notes Stacking Implementations with bq77915 Jul. 16, 2018
Application notes Bq77905 Using Multiple FETs Jul. 15, 2016
Application notes 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

EVALUATION BOARDS Download
document-generic User guide
$149.00
Description

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 (...)

Features
  • 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

REFERENCE DESIGNS Download
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 document-generic User guide

CAD/CAE symbols

Package Pins Download
TSSOP (PW) 24 View options

Ordering & quality

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