1 Features

? Battery monitoring capability for 2-series to 5-

series cells

? Integrated low-side drivers for NFET protection

with optional autonomous recovery

? Extensive protection suite including voltage,

temperature, current, and internal diagnostics

? 16-bit delta-sigma voltage ADC

– High-accuracy cell voltage measurement of 4

mV (typical)

? A dedicated simultaneous 16- and 24-bit deltasigma

coulomb counter ADC

? – High-accuracy current measurement with low

input offset error

– Wide-range current applications (±200-mV

measurement range across sense resistor)

– 48-bit accumulated charge integrator with timer

? Host-controlled cell balancing

? Multiple power modes (typical battery pack

operating range conditions)

– NORMAL mode: 32 μA to 175 μA

– SLEEP mode: 6 μA

– DEEPSLEEP mode: 2.7 μA

– SHUTDOWN Mode: <1 μA

? High voltage tolerance of 45 V on cell connect and

select additional pins

? Support for temperature sensing using an internal

sensor and external thermistor

? Integrated one-time-programmable (OTP) memory

for device settings, programmed by TI

? 400-kHz I2C serial communications with optional

CRC support

? Programmable LDO for external system usage

? 20-pin QFN (RGR) package

2 Applications

? Cordless power tools and garden tools

? Vacuum cleaners

? Non-military drones

? Other industrial battery pack (2 series to 5 series)

3 Description

The Texas Instruments BQ76905 provides a

highly integrated, high-accuracy battery monitor and

protector for 2-series to 5-series Li-ion, Li-polymer,

LiFePO4 (LFP), and LTO battery packs. Each device

includes a high-accuracy monitoring system, a highly

configurable protection subsystem, and support for

host-controlled cell balancing. Integration includes

low-side protection NFET drivers, a programmable

LDO for external system use, and an I2C host

communication interface supporting up to 400-kHz

operation with optional CRC. The BQ76905 is

available in a 20-pin QFN package.