BQ77915 Texas instruments

BQ77915

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BQ77915

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Описание

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.

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
- Documentation available to aid functional safety system design

Function	Protection
Number of series cells (min)	3, 4, 5
Number of series cells (max)	4, 5
Features	Cell balancing, FET drive, Open wire (OW), Over-temperature (OT), Overcurrent during charge (OCC), Overcurrent during discharge (OCD), Overvoltage, Short-circuit Discharge (SCD), Stackable, Under-temperature (UT), Undervoltage
Operating current (typ) (µA)	8
Rating	Catalog
Vin (max) (V)	25
TI functional safety category	Functional Safety-Capable
Overvoltage protection	3.8, 4.2, 4.25, 4.275
Operating temperature range (°C)	-40 to 85
Battery overvoltage protection (min) (V)	3
Battery overvoltage protection (max) (V)	4.575