3-Series to 5-Series Stackable Ultra-Low-Power Primary Protector With Autonomous Cell Balancing
Product details
Parameters
Package | Pins | Size
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
- Functional Safety-Capable
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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 devices 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.
Technical documentation
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. 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
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
Design files
-
download PMP40441 BOM.pdf (305KB) -
download PMP40441 Assembly Drawing.pdf (361KB) -
download PMP40441 PCB.pdf (2156KB) -
download PMP40441 CAD Files.zip (1669KB) -
download PMP40441 Gerber.zip (1529KB)
CAD/CAE symbols
Package | Pins | Download |
---|---|---|
TSSOP (PW) | 24 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
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