Overview
The BQ7791502PWR device, manufactured by Texas Instruments, is a low-power battery pack protector designed to implement a comprehensive suite of voltage, current, and temperature protections. It also features a smart cell balancing algorithm, all of which operate without the need for microcontroller (MCU) control. This device is particularly suited for battery pack applications requiring robust protection and balancing, especially in scenarios where no host monitoring is necessary. The BQ77915 series supports battery cell configurations from 3 series to 20 series or more, thanks to its stackable interface, making it highly scalable and flexible for various battery pack designs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | TSSOP-24 | - |
| Pins | 24 | - |
| Operating Temperature Range | -40 to 85 | °C |
| Quiescent Current (NORMAL mode) | 8 µA (typ.) | µA |
| Quiescent Current (HIBERNATE mode) | 2 µA | µA |
| Overvoltage Protection Range | 3 V to 4.575 V | V |
| Undervoltage Protection Range | 1.2 V to 3 V | V |
| Overtemperature Charge Threshold | 45°C or 50°C | °C |
| Overtemperature Discharge Threshold | 65°C or 70°C | °C |
| Absolute Maximum Rating per Cell Input | 36 V | V |
Key Features
- Ultra-low quiescent current: 8 µA (typ.) in NORMAL mode and 2 µA in HIBERNATE mode.
- Full suite of voltage, current, and temperature protections, including overvoltage, undervoltage, overcurrent, short-circuit, and overtemperature protections.
- Smart passive cell balancing algorithm that removes cell-to-cell imbalance, with integrated FETs supporting up to 50-mA balancing current and the option to use external FETs for higher balancing currents.
- Scalable cell count from 3 series to 20 series or more, thanks to a stackable interface.
- Independent charge (CHG) and discharge (DSG) FET drivers.
- Ultra-low power HIBERNATE mode for shipping and storing battery packs.
- Resistor programmable overcurrent delay and SHUTDOWN mode with 0.5-µA maximum current.
- Functional Safety-Capable with documentation available to aid in functional safety system design.
Applications
- Power tools and garden tools
- Robotic cleaners, vacuum cleaners, and hoverboards
- e-bikes
- Battery packs ranging from 10.8 V to 72 V
Q & A
- What is the primary function of the BQ7791502PWR device?
The BQ7791502PWR is a low-power battery pack protector that implements voltage, current, and temperature protections along with a smart cell balancing algorithm without MCU control.
- What is the quiescent current in NORMAL and HIBERNATE modes?
The quiescent current is 8 µA (typ.) in NORMAL mode and 2 µA in HIBERNATE mode.
- What is the range for overvoltage and undervoltage protection?
The overvoltage protection range is 3 V to 4.575 V, and the undervoltage protection range is 1.2 V to 3 V.
- What are the overtemperature thresholds for charge and discharge?
The overtemperature charge threshold is 45°C or 50°C, and the overtemperature discharge threshold is 65°C or 70°C.
- How does the cell balancing work?
The device features a smart passive cell balancing algorithm with integrated FETs supporting up to 50-mA balancing current. It also supports external FETs for higher balancing currents.
- What is the maximum absolute rating per cell input?
The maximum absolute rating per cell input is 36 V.
- Can the BQ7791502PWR be used in stacked configurations?
Yes, the device has a stackable interface that supports battery cell applications from 3 series to 20 series or more.
- What are some typical applications for the BQ7791502PWR?
Typical applications include power tools, garden tools, robotic cleaners, vacuum cleaners, hoverboards, and e-bikes.
- Is the BQ7791502PWR functional safety-capable?
Yes, the device is functional safety-capable, with documentation available to aid in functional safety system design.
- What is the SHUTDOWN mode current?
The SHUTDOWN mode current is 0.5 µA maximum.
