Texas Instruments 2 Series Manual

BQ76905 2-Series to 5-Series High Accuracy Battery Monitor and Protector for Li-Ion,
Li-Polymer, LiFePO
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 delta-
sigma 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
2
• 400-kHz I C 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)
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.
(LFP), and LTO Battery Packs
4
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,
LiFePO (LFP), and LTO battery packs. Each device
4
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 I
communication interface supporting up to 400-kHz
operation with optional CRC. The BQ76905 is
available in a 20-pin QFN package.
PART NUMBER
BQ76905
(1) See the orderable addendum at the end of the data sheet.
+
+
VC3A
VC3B
+
VC2
+
VC1
+
VC0
Figure 3-1. Simplified Schematic
SLUSE97 – NOVEMBER 2023
2
C host
Device Information
(1)
PACKAGE PACKAGE SIZE (NOM)
3.5 mm × 3.5 mm × 0.9
RGR (20-pin QFN)
mm, 0.5-mm pitch
VDD
REGOUT
INTP
ALERT
SDA
SDA
SCL
SCL
VSS
TS
BQ76905
PACK+
MCU
GND
PACK-