The MAX17320 is a 38μA IQ stand-alone pack-side fuel gauge IC with a protector, a battery internal self-discharge detection and an optional SHA-256 authentication supporting 2- to 4-cell battery packs of lithium-ion/polymer batteries.
The IC monitors the voltage, the current, the temperature and the battery state to prevent over- or undervoltage, overcurrent, short-circuit, over/under-temperature, overcharge, and internal self-discharge conditions. Further, it provides charging prescription to ensure that the battery operates under safe conditions and cell balancing using internal FETs.
To prevent battery pack cloning, some options of the MAX17320 come with a SHA-256 authentication including 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 voltage-based fuel gauge to provide industry-leading fuel gauge accuracy. It automatically compensates for cell aging, temperature, and discharge rate, and provides an accurate state-of-charge (SOC) in milliampere-hours (mAh) or percentage (%) over a wide range of operating conditions.
The MAX17320 also has a configurable always-on LDO that can power small critical loads on the system side without overloading the cells even under fault conditions.
The IC is available in various options with 2 types of communication interface (1-Wire® or I2C/SMBus) and 2 package types (30-bump WLP 2.4mm x 2.6mm and 24-pin TQFN 4mm x 4mm).
- Smartphones, laptops, tablets
- Medical devices, health and fitness monitors
- Digital Still, Video and Action Cameras
- Handheld Computers, Radios and Terminals
- Power Tools, Wireless Speakers, Drones
- Smart Batteries and Battery Backup
For customer evaluation, Maxim Integrated offers 4 different options of Evaluation Kits with/without SHA-256 and I2C/1-Wire communication interface in accordance to customer preferences. The Evaluation Kit includes Windows-based GUI.