1 Features

• Fully integrated 2-series, 3-series, and 4-series

cell Li-ion, LiPO, or LiFePO4 battery pack manager

and protection

• Ultra-low power 32-bit RISC processor

• TI Dynamic Z-Track™ algorithm

• Up to 40V tolerant power supply pins

• High side N-CH protection FET drive with

configurable drive strength

• Precision analog front-end with two independent

16-bit ADCs:

– Support for simultaneous current and voltage

sampling

– Support for up to four external thermistor

measurements and an internal temperature

sensor

• Primary and secondary levels of protection

– Overvoltage and undervoltage

– Overcurrent in charge and discharge

– Short circuit in discharge

– Overtemperature

– Charge timeout

– CHG and DSG FET drivers

• Sophisticated charge algorithms

– JEITA

– Adaptive charging based on cycle time, run

time, and SOH

– Cell balancing

• Integrated cell balancing while charging or at rest

• Supports TURBO mode

• Diagnostic lifetime data monitor and black box

recorder

• Optional up to three LED display support

• Supports Elliptic Curve Cryptography (ECC),

SHA-2, and SHA-1 authentication

• Up to 1MHz SMBus v3.2 host communication

support

• Compact package: 32-lead WQFN (RSN)

2 Applications

• Notebooks/netbook PCs

• Tablets

• Drones

• Handheld vacuum cleaners and vacuum robots

• Medical and test equipment

• Portable Electronics

3 Description

The BQ41Z50 device, incorporating Dynamic ZTrack

™ technology, is a fully integrated, singlechip,

pack-based solution that provides a rich

array of features for gas gauging, protection, and

authentication for 2-series, 3-series, and 4-series cell

Li-ion, LiPO, and LiFePO4 battery packs.

Using its integrated high-performance analog

peripherals and ultra-low power 32-bit RISC

processor, the BQ41Z50 device measures and

maintains an accurate record of available cell

capacity, voltage, current, temperature, and other

critical battery parameters and reports them to

the system host controller over an SMBus v3.2

compatible interface.

The BQ41Z50 device utilizes Dynamic Z-Track™

technology to report highly accurate state of

charge even under dynamic loading conditions. This

technology also improves the accuracy of TURBO

mode by providing the available max power and max

current to the host system.

The BQ41Z50 device provides an array of

battery safety functions including overvoltage,

overtemperature, overcurrent in discharge,

overcurrent in charge, and short circuit in discharge

protections. System safety functions incorporate FET

protection for the N-CH FETs and cell disconnection

detection. The device firmware provides softwarebased

1st- and 2nd-level safety protection against

overvoltage, undervoltage, overcurrent, short circuit

current overtemperature conditions. Pack- and cellrelated

faults are also handled by firmware-based

protections.