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BQ77915 Stackable Ultra-Low-Power Primary Protector
Texas Instruments' 3-series to 20-series stackable protector features autonomous cell balancing and HIBERNATE mode
Texas Instruments' BQ77915 is a low-power battery pack protector that features 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 thresholds for overtemperature discharge (OTD), undertemperature discharge (UTD), overtemperature charge (OTC), and undertemperature charge (UTC) are provided for added flexibility.
The device achieves pack protection via the integrated independent charge (CHG) and discharge (DSG) low-side NMOS FET drivers which can be disabled through two control pins. These control pins offer cell protection solutions for higher series (6-series and beyond) in a simple and economical manner. To do this, cascade a higher device CHG and DSG outputs to the immediate lower device control pins. The discharge overcurrent protection delays provide flexibility and 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. The HIBERNATE mode intended for shipping and storage enables ultra-low-power operation. The BQ77915 protector is designed for battery packs where no host monitoring is required.
- Ultra-low quiescent current: 8 µA typ. (NORMAL mode), and 2 µA (HIBERNATE mode)
- 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 overvoltage (OV) and ±18 mV for undervoltage (UV)):
- OV: 3 V to 4.575 V
- UV: 1.2 V to 3 V
- Open-cell and open-wire detection (OW)
- SHUTDOWN mode: 0.5 µA
- High 36 V absolute max. rating per cell input
- Independent CHG and DSG FET drivers
- Current protection:
- OCD 1: -10 mV to -85 mV
- OCD 2: -20 mV to -170 mV
- Short-circuit discharge: -40 mV to -340 mV
- Temperature protection:
- OTC: +45°C or +50°C
- OTD: +65°C or +70°C
- Smart cell-balancing algorithm with integrated FETs (up to 50 mA balancing current), supports external FETs for higher cell-balancing current
- Ultra-low-power HIBERNATE mode
- Resistor programmable overcurrent (OCD1/2) delay
- Power tools and garden tools
- Robotic cleaners, vacuum cleaners, and hoverboards
- eBikes
- 10.8 V to 72 V packs
BQ77915 Ultra-Low-Power Protective Pack
| Image | Manufacturer Part Number | Description | Available Quantity | Price | View Details | |
|---|---|---|---|---|---|---|
 |  | BQ7791504PW | IC BATT PROT LI-ION 3-5C 24TSSOP | 694 - Immediate | $2.15 | View Details |
Evaluation Board
| Image | Manufacturer Part Number | Description | Function | Embedded | Primary Attributes | Available Quantity | Price | View Details | |
|---|---|---|---|---|---|---|---|---|---|
|  | BQ77915EVM-014 | EVAL BOARD FOR BQ77915 | Battery Protection | - | - | 3 - Immediate | $178.80 | View Details |
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