Texas Instruments BQ76922 Manual

BQ76922 3-Series to 5-Series High Accuracy Battery Monitor and Protector for Li-Ion,

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 I
HDQ one-wire interface
• Programmable LDO for external system usage
• 32-pin QFN package (RSN)
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
Li-Polymer, and LiFePO
2
C, and
SLUSE86A – APRIL 2022 – REVISED APRIL 2024
Battery Packs
4

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, Li-
polymer, and LiFePO
4
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
2
400kHz I C and HDQ one-wire standards. The
BQ76922 device is available in a 32-pin 4 × 4 mm
QFN package.
Device Information
(1)
PART NUMBER PACKAGE
BQ76922 RSN (32-pin)
(1) See the Device Comparison Table
device family. For all available devices, see the orderable
addendum at the end of the data sheet.
CHG
BAT
1
VC5
2
+
VC4A
3
+ VC4B
RST_SHUT
4
VC3A
5
+
VC3B
6
VC2
7
+
VC1
8
+
Simplified Schematic
BQ76922
battery packs. The device
BODY SIZE (NOM)
4mm × 4mm
for information on the
PACK+
DSG
BREG
24
REGIN
23
VDD
REG1
22
21
DFETOFF
20
MCU
CFETOFF
19
SDA
18
SCL
17
GND
PACK-