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Analog Devices MAX17320 ModelGauge m5 EZ Fuel Gauge is a 38µA IQ stand-alone pack-side fuel gauge IC with protector and battery internal self-discharge detection. It also includes an 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 protect against over/undervoltage, overcurrent, short-circuit, over/under temperature, and overcharge. It also includes 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. ADI MAX17320 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 the ADI ModelGauge™ m5 algorithm that combines the short-term accuracy and linearity of a coulomb counter with the long-term stability of a voltage-based 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 ADI MAX17320 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 MAX17320 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.
