P9028AC-0AWGI

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PMIC, short for Power Management integrated Circuit, is a type of integrated circuit that serves the purpose of managing a power system. Among the different types of PMICs, the specialized type can be used for more specific power management tasks, such as ensuring that the load voltage and current remain in a certain range under varying loads, providing over-temperature protection, and so on. In this article, we will explore one such specialized type of power management integrated circuit – the P9028AC-0AWGI.

The P9028AC-0AWGI PMIC from the former Chipcon company is a Low-Dropout (LDO) voltage regulator for low-voltage loads. It has an output voltage accuracy of ±2% and comes in a tiny 2x2mm² package. A voltage defined as “Low-Voltage” is usually defined as 2 volts and below, and in this case the P9028AC-0AWGI is designed to regulate typical voltages of 1.8V and 0.9V.

The P9028AC-0AWGI is suitable for a number of applications, ranging from battery-powered portable electronics like digital cameras and mobile phones to embedded systems like microcontrollers and memory chips, and medical devices. In the following sections, we will discuss the working principle and application areas of the P9028AC-0AWGI PMIC in more detail.

Working Principle

The P9028AC-0AWGI is a Low Drop-Out (LDO) Regulator, a type of linear regulator. Its integrated circuit includes a power transistor connected in series with a shunt regulator. It works in the following manner:

The power transistor rejects any voltage from the main power game exceeding its drop-out voltage, providing cleaner and more stable output voltage. The shunt regulator then compares the output voltage of the power transistor against an internal voltage reference, and regulates it depending on the difference. If the output voltage is higher than the internal reference, the shunt regulator reduces the current through the power transistor. If the output voltage is lower than the internal reference, then the current is increased. This mechanism ensures that the output voltage stays within specified range at all times.

Applications

As mentioned earlier, the P9028AC-0AWGI is ideal for portable electronic devices, embedded electronics, and medical devices. Low-Voltage loads usually draw a comparatively high amount of current, and the P9028AC-0AWGI is well-suited for regulating them, as it has a very low drop-out voltage and a high peak current of up to 1.5A.

The P9028AC-0AWGI can also be used for powering memory chips, microcontrollers, LCD displays, touchpads and similar peripherals. Its low quiescent current ensures that it does not draw too much current when it is not actively regulating, thus saving power and extending the battery life of the device.

It also offers a range of other features like over-temperature protection, over-voltage protection, short-circuit protection, and so on. This makes it ideal for applications where safety is critical and failure must be avoided at all costs.

Conclusion

The P9028AC-0AWGI from Chipcon is an LDO Regulator suitable for a range of low-voltage applications like portable electronics, embedded systems and medical devices. Its low quiescent current and high peak current allows for energy efficient and safe operation, and its over-temperature protection and other safety features make it ideal for safety-critical applications.

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