BQ2057CTSTR

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BQ2057CTSTR application field and working principle

PMIC - Battery Chargers is an important area in power management integrated circuit, and BQ2057CTSTR (BQ2057) is one of the key components of Battery Chargers. In this article, the application field of BQ2057CTSTR and its working principle will be discussed in detail.

Application field of BQ2057CTSTR

BQ2057CTSTR (BQ2057) is a smart power management integrated circuit (PMIC) developed by Texas Instruments. It is a single-cell Li-ion/lithium polymer Battery Chargers with reverse current protection. BQ2057 has wide operating temperature range (-40°C to +85°C) and low power consumption (2W max.).

BQ2057CTSTR is mainly used in portable electronic devices, such as digital cameras, cell phones and portable video players. In these applications, BQ2057CTSTR can provide a constant voltage and current to charge the battery and regulated output voltage to drive the load.

Working principle of BQ2057CTSTR

BQ2057CTSTR has an internal charge-pump function which allows it to generate 3.2V output from the battery. The charging current is set by an external resistor between charge-pump VREF and ground. A comparator monitors the voltage at the end of the battery to determine when the battery is fully charged.

The BQ2057CTSTR also contains an enumerate circuit which detects the current being drawn by the device. The enumerate circuit samples the voltage at the charging terminals and compares it to the reference voltage. If the voltage is greater than the reference voltage, the BQ2057CTSTR will limit the charge current.

Finally, the BQ2057CTSTR also contains a low-side power switch to disconnect the load when the battery is fully charged or when the battery voltage is too low. This is a useful feature for applications that require the device to shut down when the battery is no longer capable of providing enough power.

Conclusion

In conclusion, BQ2057CTSTR is a smart PMIC designed for charging single-cell Li-ion/lithium polymer batteries. BQ2057CTSTR has wide operating temperature range and low power consumption, and its application field is mainly in portable electronic devices. Besides, the working principle of BQ2057CTSTR includes charge-pump, enumerate circuit and a low-side power switch.

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