1 Features

• Battery monitoring capability for 3-series to 5-

series cells

• Integrated charge pump for high-side NFET

protection with optional autonomous recovery

• Extensive protection suite including voltage,

temperature, current, and internal diagnostics

• Two independent ADCs

– Support for simultaneous current and voltage

sampling

– High-accuracy coulomb counter with input

offset error < 1μV (typical)

– High accuracy cell voltage measurement <

10mV (typical)

• Wide-range current applications (±200mV

measurement range across sense resistor)

• Integrated secondary chemical fuse drive

protection

• Autonomous or host-controlled cell balancing

• Multiple power modes (typical battery pack

operating range conditions)

– NORMAL mode: 286μA

– Multiple SLEEP mode options: 24μA to 41μA

– Multiple DEEPSLEEP mode options: 9μA to

10μA

– SHUTDOWN mode: 1μA

• High-voltage tolerance of 60V on cell connect and

select additional pins

• Tolerant of random cell attach sequence on

production line

• Support for temperature sensing using internal

sensor and up to five external thermistors

• Integrated one-time-programmable (OTP) memory

programmable by customers on production line

• Communication options include 400kHz I2C, and

HDQ one-wire interface

• Programmable LDO for external system usage

• 32-pin QFN package (RSN)

2 Applications

• Cordless power tools and garden tools

• Vacuum cleaners

• Vacuum robots

• Non-military drones

• Other industrial battery pack (3-series–5-series)

3 Description

The Texas Instruments BQ76922 device is a

highly integrated, high-accuracy battery monitor

and protector for 3-series to 5-series Li-ion, Lipolymer,

and LiFePO4 battery packs. The device

includes a high-accuracy monitoring system, a

highly configurable protection subsystem, and support

for autonomous or host controlled cell balancing.

Integration includes high-side charge-pump NFET

drivers, a programmable LDO for external system

use, and a host communication peripheral supporting

400kHz I2C and HDQ one-wire standards. The

BQ76922 device is available in a 32-pin 4 × 4 mm

QFN package.