MAX6381XR39D2+T

Series:	--
Packaging:	Strip
Part Status:	Active
Type:	Simple Reset/Power-On Reset
Number of Voltages Monitored:	1
Output:	Push-Pull, Totem Pole
Reset:	Active Low
Reset Timeout:	20 ms Minimum
Voltage - Threshold:	3.9V
Operating Temperature:	-40°C ~ 125°C (TA)
Mounting Type:	Surface Mount
Package / Case:	SC-70, SOT-323
Supplier Device Package:	SC-70-3
Base Part Number:	MAX6381

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Introduction

The MAX6381XR39D2+T is a power management integrated circuit (PMIC) targeting those applications that require always-on monitoring. This PMIC supervisory device provides overvoltage, undervoltage, and reset sequencing protection on systems with multiple voltage rails. The device includes an on-chip voltage monitor with adjustable regulation threshold. By adding a small number of external components, the MAX6381XR39D2+T can be used as a primary supervisor, generate system reset signals, and provide power-fail/brown-out detection.

Application field

The MAX6381XR39D2+T is widely used in industrial computers, communications, IoT systems, medical instrumentation, desktop and notebook computers, instrumentation, military electronics, automotive systems, and any other application requiring precision power management. This PMIC supervisor device can be used to monitor and respond to faults by switching off external supplies, generating a system reset, or setting an interrupt indicator.

Features

The MAX6381XR39D2+T series features an adjustable threshold detector to detect overvoltage, undervoltage, or plug-in/unplug events. The detection threshold has an adjustable range of 0.8V to 6.25V and can be programmed using external resistors. The device also provides output logic levels that are configurable to either active high or low, resulting in easily configurable reset and interrupt outputs. An additional input pin provides a power-on/ramp reset mode, with a programmable reset time of up to 500ms. The device also includes a watchdog timer functionality, which prevents logic lockup due to software malfunction by resetting the system based on user-defined periods of time. By adding a capacitor to the timer pin, the MAX6381XR39D2+T can be configured to generate a watchdog-generated system reset after a programmable interval.

Working Principle

When the voltage at the monitoring pin (VIN) exceeds a set threshold, the MAX6381XR39D2+T generates a reset or an interrupt signal depending on the settings. Similarly, when the input voltage drops below the preset threshold, the MAX6381XR39D2+T will also generate a reset or an interrupt signal.When the device is operated in power-on/ramp reset mode, the output is activated to reset all components in the system after a programmable delay. This feature is triggered by the rising of the reset input voltage (VIN). The timer pin is used to define an upper time limit in which the reset activity must take place. The duration of the reset delay can be adjusted via an external capacitor, enabling the system to reboot or reset within a user specified range.The MAX6381XR39D2+T supervisor also features a watchdog timer, which will trigger a system reset if no reset signal is received from the processor in the system within a user-defined span of time, thus preventing system lockup which might otherwise occur as a result of a hardware/software issue.

Conclusion

The MAX6381XR39D2+T PMIC supervisor device is suitable for overvoltage, undervoltage, and reset sequencing protection in applications that require always-on monitoring. The device provides an adjustable threshold detector, configurable reset and interrupt outputs, and power-on/ramp reset mode, along with watchdog timer functionality that helps to prevent logic lockup due to software malfunction.

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