BQ77915

BQ77915 SLUSCU0L – MARCH 2018 – REVISED AUGUST 2023 BQ77915 3-Series to 5-Series Stackable Ultra-Low Power Primary Protector with Autonomous Cell Balancing and HIBERNATE Mode 1 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 – Documentation available to aid functional safety system design 2 Applications Power tools, garden tools Robotic cleaners, vacuum cleaners, hoverboards e-bikes 10.8-V to 72-V packs 3 Description ...