Texas Instruments' bq40z60 device is a Battery Pack Manager that integrates battery charging control output, gas gauging, and protection for completely autonomous operation of 2- to 4-series cell Li-Ion and Li-Polymer battery packs. The architecture enables internal communication between the fuel gauging processor and battery charger controller to optimize the charging profile based on the external load conditions and power path source management during load transients and adaptor current limitations in the system. The charging current efficiency is scalable for power transfer based on the external components, such as the NFETs, inductor, and sensing resistor.
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- Fully integrated 2- to 4-series cell Li-Ion or Li-Polymer battery pack manager
- Input voltage range on pack+: 2.5 to 25 V
- Battery charger efficiency > 92%
- Battery charger operation range: 4 to 25 V
- Battery charger, 1 MHz synchronous buck controller for external NFETs
- Soft start to limit in-rush current
- Current limit protection for external switches
- Programmable charging: supports JEITA/enhanced charging modes
- N-FET high-side protection FET drive
- Thermistor inputs for NTC
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- Fuel gauging
- High resolution 16-bit integrator for Coulomb counter
- ADC, 16-bit for precision V, I, and T measurements with 16-channel multiplexer
- Support for simultaneous CC and ADC sampling (power conversion)
- Supports two-wire SMBus v2.0 interface with accelerated 400 kHz programming option
- SHA-1 Hash Message Authentication Code (HMAC) responder for increased battery pack security: split key (2 × 64) stored in secure memory
- Supports field updates
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