BQ27Z855
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- Fully integrated battery fuel gauge, linear battery charger, protector, and authenticator
- Battery chemistries supported include Li-ion with LCO, NMC, or LFP cathodes
- Battery fuel gauging based on patented Dynamic Z-Track technology
- Automatically adjusts for aging, temperature, and rate-induced effects on the battery
- Fully featured battery linear charger
- CC/CV charging up to 2A with JEITA-compliant integrated Advanced Charge Algorithm (ACA)
- Dynamic Power Path Management
- MINSYS mode to ensure system voltage does not drop below target threshold while charging with a weak input
- SUPPLEMENT mode with ultra fast switching time to ensure system does not brown out during loads while charging
- Ideal diode (ID) mode during discharge to prevent voltage drop to system load
- PACK+ terminal voltage tolerance of +24V with 1kΩ RPACK value
- High-accuracy analog front end with two independent ADCs:
- 18-bit low offset delta-sigma ADC for Coulomb counting with ±100mV input range
- 16-bit delta-sigma ADC for cell voltage and internal and external temperature sensors
- Programmable safety and protection:
- Hardware-level protections
- Over Voltage Protection (OVP)
- Under Voltage Protection (UVP)
- Over Current Charging (OCC)
- Over Current Discharging (OCD)
- Short Circuit Discharging (SCD)
- Firmware-level protections
- OVP, UVP, OCC, and OCD
- Under Temperature (UT)
- Over Temperature (OT)
- FET Failure (FETF)
- Charge Timeout (CTO)
- Hardware-level protections
- ECC ECDSA authentication support with secure memory
- True zero-volt charging to support dead battery charging
- Integrated RTC with calendar and time of day
- Ultra-compact, 15-ball DSBGA package (YAH)
The Texas Instruments BQ27Z855 Dynamic Z-Trackgas gauge solution is a fully integrated, accurate 1-series cell gas gauge, JEITA-compliant linear battery charger, protection, and authentication solution.
The BQ27Z855 gas gauge communicates through an I2C compatible interface and combines an ultra-low power ARM M0 RISC processor, high accuracy analog measurement capabilities, integrated flash memory, high-side NMOS FET drivers, and ECC ECDSA authentication to provide a complete, high-performance battery management solution.
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| 重要文件 | 類型 | 標題 | 格式選項 | 下載最新的英文版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 使用指南 | BQ27Z855 Technical Reference Manual (Rev. A) | PDF | HTML | 2026/7/21 | ||
| 應用說明 | Dynamic Z-Track™ Technology: An Advanced Battery Gauging Algorithm for Dynamic Load Applications (Rev. A) | PDF | HTML | 2025/7/15 | |||
| 應用說明 | Implementation of Elliptic Curve Cryptography Authentication on TI Battery Fuel Gauges | PDF | HTML | 2025/5/28 | |||
| 應用說明 | How to Create and Program Authentication Keys into TI Battery Fuel Gauges | PDF | HTML | 2025/3/5 | |||
| 應用說明 | Battery Gauging Algorithm Comparison | PDF | HTML | 2023/12/4 |