PT7M7803SC3EX

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Power management integrated circuits (PMICs) are essential components used in a wide range of applications, such as industrial and consumer electronics, telecom systems, medical equipment, automotive and other transportation systems. Among the variety of PMICs, Supervisors (also known as System Reset Circuits) are important for providing reliable protection for the system. Onchip system Reset Supervisors, in particular, are highly desirable as they could minimize system hardware, costs, and complexity. An example of PMIC Supervisors is the PT7M7803SC3EX from Richtek Technology. In this article, we’ll look at the application field and working principle of the PT7M7803SC3EX.

PT7M7803SC3EX is a Power System Reset IC for Mobile Device Applications. It is designed for use in applications that require reliable, high-accuracy system reset during voltage transients. Its features include a wide operating supply voltage range, excessive current protection, adjustable reset time delay, and low supply current. The device is offered in a compact 6-pin USON package.

The operating supply voltage range of PT7M7803SC3EX is between 0.65V with the minimum supply voltage of 0.6V and maximum supply voltage of 6.2V with maximum voltage tolerance of ±1V. It provides a maximum 4ms reset time delay with a minimum 0.5ms reset time delay. It also offers reset threshold voltage of 0.48V with ±3% accuracy. The device supports an excessive current protection option of 8mA with an adjustable over-current threshold. Lastly, it has a maximum 2µA supply current for small size and compact applications.

In terms of application field, PT7M7803SC3EX, as mentioned, is designed for use in mobile device applications. The reset circuit is especially important for these applications as it ensures system reliability and integrity during voltage transitions. Other applications include high-voltage systems, low-voltage systems, battery-powered systems, industrial systems, communication systems, automotive systems, power supply and other portable equipment.

Finally, let’s discuss the working principle of the PT7M7803SC3EX. In short, the device is used to provide a reset signal when the supply voltage reaches a certain threshold level, allowing the system to reboot safely. The reset signal is generated by an integrated voltage detector that monitors the system voltage. When the system voltage drops below the preset threshold voltage (typically 0.5V), the voltage detector detects the voltage drop and asserts a reset signal. The reset signal remains asserted for a certain duration (adjustable by an external capacitor) and reset to logic low once the supply voltage is back to normal. This ensures that the system always starts from a clean and safe state.

In conclusion, PT7M7803SC3EX from Richtek Technology is a PMIC supervisor designed for mobile device applications. It provides reliable protection for the system from voltage transients by detecting and responding to sudden voltage drops. It has a wide operating supply voltage range, adjustable reset time delay, and low supply current, all of which makes it a great choice for compact system designs.

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