TI single-cell fuel gauge product classification and how to select

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TI single-cell fuel gauge product classification and how to select [Copy link]

The models currently promoted by TI are:

BQ27541, BQ27741, BQ27510, BQ27520, BQ27531/530, BQ27421/441, BQ27425.

1. Consider the package BQ27741 BQ27520 BQ27425BQ27530/BQ27531 are CSP packages, which have high process requirements for many applications. BQ27541 BQ27510 BQ27441/BQ27421 (421 is a 9-ball CSP, which does not require via layout) is conducive to improving mass production yield and testing

2. Accuracy and cost requirements, BQ27541 BQ27741 BQ27510 BQ27520 BQ27531/530 design accuracy is 1%, based on Flash, the cost is relatively high, BQ27421/441 BQ27425 design accuracy is 5%, BQ27425 is medium cost, BQ27421/441 storage device is ROM, low cost

3. System side and battery side, BQ27541/BQ27741 is a packside fuel gauge, usually placed in the battery pack, the entire production is completed by the battery manufacturer, the accuracy is also higher, the system user only needs to complete the I2C read and write capacity information command, the development difficulty is very low, and can be used for battery identification, the disadvantage is that the cost of the whole solution will be slightly higher. The other fuel gauges are system side fuel gauges, placed on the motherboard, the system user needs to complete the parameter configuration and other debugging processes, which will be slightly complicated

4. Other factors: BQ27741 is a power meter with protection function, which can set more flexible protection

BQ27530/531 has charger control function, which can realize charging optimization

BQ27425/BQ27421 is a fuel gauge with integrated current sampling resistor, and the maximum long-term discharge current only supports 2A

BQ27421/BQ27441 is a simple and easy-to-use electricity meter with a simple configuration parameter process, suitable for single-chip control occasions

BQ27620 is a voltage-only electricity meter and is relatively complex to use. It is recommended to contact FAE before selecting the model.

MartinFowler

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