Texas Instruments BQ76972 Manual

BQ76972 3-Series to 16-Series High Accuracy Battery Monitor and Protector for

1 Features

• Battery monitoring capability for 3-series to 16-
series cells
• High accuracy cell voltage measurement of ±3.0
mV
• 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 < 1 µV (typical)
• Wide-range current applications (±200-mV
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: 286 µA
– Multiple SLEEP mode options: 24 µA to 41 µA
– Multiple DEEPSLEEP mode options: 9 µA to 10
µA
– SHUTDOWN mode: 1 µA
• High-voltage tolerance of 85 V 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 nine external thermistors
• Integrated one-time-programmable (OTP) memory
programmable by customers on production line
• Communication options include 400-kHz I
and HDQ one-wire interface
• Dual-programmable LDOs for external system
usage
• 48-pin TQFP package (PFB)
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-Ion, Li-Polymer, and LiFePO
2
C, SPI,
Battery Packs
4

2 Applications

• Energy storage systems
• Battery backup unit (BBU)
• E-bike, e-scooter, and LEV
• Cordless power tools and garden tools
• Non-military drones
• Other industrial battery pack (≥10series)

3 Description

The Texas Instruments BQ76972 device is a
highly integrated, high-accuracy battery monitor
and protector for 3-series to 16-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, dual programmable LDOs for external system
use, and a host communication peripheral supporting
2
400-kHz I C, SPI, and HDQ one-wire standards.
The BQ76972 device is available in a 48-pin TQFP
package.
Device Information
(1)
PART NUMBER PACKAGE
BQ76972xy PFB (48-pin)
(1) See the Device Comparison Table
device family. For all available devices, see the orderable
addendum at the end of the data sheet.
+
VC15
+
VC14
+
VC13
+
VC12
+
VC11
+
+ VC10
VC9
+
+ VC8
+ VC7
VC6
+
+ VC5
VC4
+
+
+
+
Simplified Schematic
BQ76972
SLUSFC9 – DECEMBER 2023
battery packs. The device
BODY SIZE (NOM)
7 mm × 7 mm
for information on the
PACK+
CHG DSG
COMM TO
SYSTEM
COMMUNICATIONS
5 V
TRANSCEIVER
COMM
REGIN
REG1
VDD
REG2
3.3 V
RST_SHUT
DDSG
MCU
DCHG
DFETOFF
CFETOFF
HDQ
SDA
SCL
ALERT
GND
PACK–