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Substrate control technology of charge control chip

Substrate control of charge control chip is a technology that relates to the substrate connection of the power tube inside the chip, which is particularly important for high-input withstand voltage charge management chips. The following is a brief introduction to the substrate control functions:

Main component

Substrate control function

Substrate control mainly refers to the charge management chip, through a specific circuit design to control the substrate connection of the power tube, in order to achieve anti-backdown function and improve the voltage resistance of the chip.

Anti-backdown function

In the high input voltage withstand charge management chip, the substrate control can be achieved through the "back-to-back" NMOS power tube design to achieve anti-backdown function. This design turns the power tube off by controlling the gate, while ensuring that the substrate diode operates in a reverse cut-off state, thereby preventing current from flowing from the battery (BAT) to the input (VIN) or ground (GND), preventing the battery from backing up current.

Improve voltage resistance

Substrate control technology can help the charge management chip work under high input voltage, through a specific substrate connection, improve the voltage resistance of the chip, so that it can work safely under the input voltage of up to 28V.

Substrate connection of the power tube

In the design of some charge management chips, the substrate of the NMOS power tube is connected to the source, which helps to achieve low on-resistance characteristics. Substrate control technology can manage the substrate connections of these power tubes to optimize chip performance and safety.

Substrate selection circuit

In some charge management chips, there will be a substrate selection circuit designed to connect to the VIN or BAT through the substrate controlling the power tube to achieve different functions, such as preventing backflow current or improving the input voltage withstand of the chip.

In summary, substrate control plays an important role in the charge control chip, which not only helps to improve the voltage resistance of the chip, but also plays a key role in preventing battery backflow, protecting the battery and extending the battery life. Through this technology, charge management chips can provide safer and more reliable charging solutions for electronic devices.

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