BQ77904

BQ77904, BQ77905 SLUSCM3K – JUNE 2016 – REVISED JULY 2020 BQ77904, BQ77905 3-Series to 20-Series Ultra Low-Power Voltage, Current, Temperature, and Open-Wire Stackable Lithium-Ion Battery Protector 1 Features 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 2 Applications Power tools, garden tools Start-stop battery packs Lead-acid (PbA) replacement batteries Light electric vehicles Energy storage systems, uninterruptible power supplies (UPS) 10.8-V to 72-V packs 3 Description The BQ77904 and BQ77905 devices are...