BQ77905
Overview
The BQ77904 and BQ77905 devices are low-power battery pack protectors that implement a suite of voltage, current, and temperature protections 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.
- NORMAL mode: 6 µA (BQ77904 and BQ77905)
- Full suite of voltage, current, and temperature protections
- Scalable cell count from 3 series to 20 series or more
- Voltage protection (accuracy ±10 mV) - 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 - Accuracy ±20% for ≤ 20 mV, ±30% for > 20 mV across full temperature
- Temperature protection - Overtemperature charge: 45°C or 50°C - Overtemperature discharge: 65°C or 70°C - Undertemperature charge: -5°C or 0°C - Undertemperature discharge: -20°C or -10°C
- Additional Features - Independent charge (CHG) and discharge (DSG) FET drivers - 36-V absolute maximum rating per cell input - Built-in-self-test functions for high reliability
- SHUTDOWN mode: 0.5-µA maximum
- Functional Safety-Capable - Documentation available to aid functional safety system design
