MAX17320G22+

The MAX17320 is a 38μA IQ stand-alone pack-side fuel
gauge IC with protector, battery internal self-discharge detection, and optional SHA-256 authentication for 2 to 4 series lithium-ion/polymer batteries.
The IC monitors the voltage, current, temperature and
state of the battery to provide protection against over/undervoltage, overcurrent, short-circuit, over/undertemperature, overcharge, and internal self-discharge conditions
using external high-side N-FETs, and provides charging
prescription to ensure that the battery operates under safe
conditions, thereby prolonging the life of the battery. The
IC balances the cells using internal FETs. During prequal
charging, the IC uses the CHGFET to linearly control
charging.
To prevent battery pack cloning, the IC integrates
SHA-256 authentication with a 160-bit secret key. Each IC
incorporates a unique 64-bit ID.
The fuel gauge uses Maxim ModelGaugeTM m5 algorithm
that combines the short-term accuracy and linearity of a
coulomb counter with the long-term stability of a voltagebased fuel gauge to provide industry-leading fuel gauge
accuracy. The IC automatically compensates for cell aging, temperature, and discharge rate, and provides accurate state-of-charge (SOC) in milliampere-hours (mAh) or
percentage (%) over a wide range of operating conditions.
The IC provides a configurable always-on LDO that can
power small critical loads on the system side without overloading the cells even under fault conditions. Dynamic
power functionality provides the instantaneous maximum
battery output power which can be delivered to the system
without violating the minimum system input voltage.
A Maxim 1-Wire® or 2-wire I2C/SMBus interface provides
access to data and control registers. The IC is available in
a lead-free, 2.4mm x 2.6mm 30-bump 0.4mm pitch WLP
and 4mm x 4mm 24-pin TQFN packages.