APX811-40UG-7

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Power management integrated circuits, or PMICs, are essential components of nearly every electronics device, providing systems with clean, regulated power and helping to extend battery life. Within this type of component, supervised devices typically provide extra levels of safety and protection against overload, short-circuits and other damage. The APX811-40UG-7 is one of these components, a cost effective power supervisor with high current capacity for system power-on reset. This article will look at the application fields and working principles that make the APX811-40UG-7 an attractive choice.

Application field

The APX811-40UG-7 is designed for use within portable electronic devices, particularly with applications where space is a priority. As such, its power management capabilities are useful in scenarios where long-term battery efficiency is necessary, such as cellular phones and other handheld devices. Furthermore, its high current capacity will be of use to users who require reliable power-on reset or where there is an elevated risk of reset undershoot or overshoot.

The component is suitable for use with a range of rechargeable batteries, such as nickel metal hydride and lithium-ion types. It is also a cost-effective solution for applications requiring both 3V and 5V reset. The component is small, with a maximum package size of 1.3mm x 1.3mm x 0.65mm, and its simplicity makes it applicable to a wide range of projects.

Working principle

In order to achieve its high current capacity, the APX811-40UG-7 uses a power transistor integrated circuit, or PTMOS, which allows for current to be switched on or off quickly. This PTMOS is connected to three separate power inputs, so the controller can detect when the voltage of a particular input has exceeded a set value. When this occurs, the PTMOS is triggered and the device is then powered off. The controller will then switch off the current to the input and wait for the voltage to drop below a certain level before resetting the controller.

The APX811-40UG-7 has both external and internal reset thresholds. The external reset threshold is used to set the device’s power-on reset, while the internal reset threshold is used to set the point at which the device will switch itself off. The reset threshold is adjustable—users can choose to set the reset thresholds at any desired voltage, allowing them to tailor the performance of their device according to their requirements.

In addition to its reset capabilities, the APX811-40UG-7 also offers protection against current over-voltage, over-current, and short-circuit faults. The component is designed with a built-in thermal shutdown feature and an internal auto-restart function, which enables users to shut off their device quickly in case of an emergency.

Conclusion

The APX811-40UG-7 is an attractive option for users seeking a cost-effective power supervisor with reliable high current capacity for system power-on reset. Its small size and internal features make it suitable for portable electronics applications, particularly those where long-term battery life is a necessity. Furthermore, the adjustable, external and internal reset thresholds make it an ideal choice for users who need to customize the level of protection their device requires.

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