LM809M3X-3.08/NOPB

Output:	Push-Pull, Totem Pole
Reset:	Active Low
Reset Timeout:	140 ms Minimum
Voltage - Threshold:	3.08V
Operating Temperature:	-40°C ~ 105°C (TA)
Mounting Type:	Surface Mount
Package / Case:	TO-236-3, SC-59, SOT-23-3
Supplier Device Package:	SOT-23-3
Base Part Number:	LM809
Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Type:	Simple Reset/Power-On Reset
Number of Voltages Monitored:	1

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LM809M3X-3.08/NOPB Supervisors: Application Field and Working Principle

Power Management Integrated Circuits (PMICs) are widely used in advanced electronic systems due to their ability to monitor, manage, and optimize the power supply for various components. PMICs are widely used in communication networks, computer systems, and other electronic systems.PMICs are divided into various categories according to their functionality, one of which is Supervisors. LM809M3X-3.08/NOPB Supervisors is a PMIC with standby operation, which performs the following tasks:

• Monitors and controls the power supply;
• Manages power distribution between different components;
• Detects supply voltage brown-out conditions;
• Provides delay between power up and detection of supply voltage brown-out conditions.

The LM809M3X-3.08/NOPB Supervisors offers the following features:

• 4.5V to 18V operating supply voltage range;
• In-circuit voltage monitoring;
• Factory programmed delay times;
• Protects against under-voltage and over-voltage conditions;
• 4-pin Standard Small Outline Integrated Circuits (SSOP) package;
• Low power consumption;
• Reliable Reset Output transistor.

The LM809M3X-3.08/NOPB Supervisors is widely used in electronic systems such as computers, communication networks and power converters to maintain the supply voltage within a predefined range and to protect the system from over-voltage, under-voltage, short-circuit, and other voltage-related malfunctions. The working principle of the LM809M3X-3.08/NOPB Supervisors is relatively simple; it consists of two parts:

• Voltage Detection Circuit;
• Delay and Reset Output Circuit.

The voltage detection circuit monitors the supply voltage, and when the voltage falls below or rises above the pre-defined threshold, the circuit activates the reset output, which then triggers a delay period. During the delay period, the circuit monitors the voltage again, and if the voltage falls or rises beyond the predefined threshold, the reset output is triggered, which then signals the electronic system to shut down or reset itself.The delay and reset output circuit consists of an internal comparator and a reset timer. The comparator continuously monitors the supply voltage against the internally programmed threshold voltage, and when the voltage detected by the comparator is below or above the threshold, the comparator triggers the reset output to activate the delay timer. The delay timer allows the user to program a delay time ranging from 33ms to 250ms, giving the circuit time to detect any sudden changes in the supply voltage. At the end of the delay time, the reset output is triggered and the reset signal is sent to the electronic system.In conclusion, the LM809M3X-3.08/NOPB Supervisors is an integrated circuit with standby operation and forms part of the PMIC family. The LM809M3X-3.08/NOPB Supervisors provides a reliable and accurate solution for detecting and responding to supply voltage brown-out conditions. With a wide operating voltage range and low power consumption, this Supervisor is suitable for use in a wide range of applications.

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