PT7M7809TUWF

Series:	--
Part Status:	Obsolete
Type:	Simple Reset/Power-On Reset
Number of Voltages Monitored:	1
Output:	Push-Pull, Totem Pole
Reset:	Active Low
Reset Timeout:	140 ms Minimum
Voltage - Threshold:	3.08V
Operating Temperature:	-40°C ~ 85°C (TA)

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Introduction

PMIC - Supervisors are power management integrated circuits (PMIC) that detect logical input power faults, such as over-current, over-voltage, under-voltage and brownout. Examples include the PT7M7809TUWF, which is a supervisor integrated circuit that combines all the features of a traditional supervisor. It provides over-voltage/under-voltage protection, voltage and current monitoring, programmable delays for power-on reset, and open-drain output. This application note provides an overview of the device\'s application field and working principle, as well as its features and benefits.

Application Field and Working Principle

The PT7M7809TUWF is designed for high-integrity voltage and current monitoring as well as brownout/overvoltage protection of digital power supplies (VCC) in PC, notebook, tablet and portable electronic equipment applications.The PT7M7809TUWF derives its part number from its two main functions—voltage and current monitoring, and over-voltage protection. The PT7M7809TUWF includes voltage range registers, programmable threshold voltage values, and current trip point registers. The voltage and current monitoring feature allows the device to sense when the regulated voltage has exceeded its maximum or minimum threshold limit. The over-voltage protection feature monitors the VCC pin continuously and resets the system along with LED indication in case the voltage has exceeded a preprogrammed limit.

Features and Benefits

The PT7M7809TUWF features several features that help to improve the system-level protection of digital supplies. The most important features are the ability to detect overvoltages, undervoltages and open-drain output.The open-drain output is an active low output signal indicating that the voltage has exceeded a programmable overvoltage trip point. This output is used to alert external controllers during a fault event, allowing the system to take the necessary steps to protect the system. The overvoltage trip point is user-configurable and can be programmed in 5-step increments. The device\'s undervoltage protection features can also detect when the voltage drops below a user-specified level, thus generating a reset signal and/or interrupting the system.The device also has a programmable power-on delay, which allows for a programmable delay of up to 255 milliseconds between the power-on event and the device\'s output going high. This helps to ensure that the system remains stable when power events occur.Finally, the PT7M7809TUWF offers current monitoring, making it an excellent solution for systems where the current must be monitored. The device has an adjustable trip point and can detect a short-to-VCC, short-to-ground and overcurrent condition.

Conclusion

The PT7M7809TUWF PMIC - Supervisors are a high-integrity solution for digital power supplies (VCC), offering overvoltage protection, voltage and current monitoring, programmable delays for power-on reset and open drain output. This application note provided an overview of the device’s application field and working principle, as well as its features and benefits.

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