LM809M3-4.63

Product Overview

Category

The LM809M3-4.63 belongs to the category of voltage supervisors.

Use

It is primarily used for monitoring and controlling the voltage levels in electronic circuits.

Characteristics

• Voltage Range: 4.63V
• Package Type: SOT-23
• Low Quiescent Current: 1.5µA (typical)
• Accuracy: ±2%
• Power-On Reset Delay: 200ms (typical)
• Operating Temperature Range: -40°C to +85°C

Package and Quantity

The LM809M3-4.63 is available in a small SOT-23 package. It is typically sold in reels or tubes containing multiple units.

Essence

The essence of the LM809M3-4.63 lies in its ability to provide accurate voltage monitoring and reset functionality, ensuring reliable operation of electronic systems.

Specifications

• Supply Voltage Range: 1.0V to 6.0V
• Threshold Voltage: 4.63V
• Reset Output: Active Low
• Quiescent Current: 1.5µA (typical)
• Power-On Reset Delay: 200ms (typical)
• Reset Timeout Period: Adjustable
• Hysteresis: 50mV (typical)

Pin Configuration

The LM809M3-4.63 has three pins:

1. VDD: Connect this pin to the positive supply voltage.
2. GND: Connect this pin to the ground reference.
3. RESET: This pin provides an active low reset signal when the monitored voltage falls below the threshold.

Functional Features

1. Voltage Monitoring: The LM809M3-4.63 continuously monitors the input voltage and generates a reset signal when it drops below the threshold voltage.
2. Power-On Reset: It provides a power-on reset delay of 200ms to ensure stable operation during power-up.
3. Adjustable Timeout Period: The reset signal remains active for a user-adjustable period after the voltage rises above the threshold, allowing sufficient time for the system to stabilize.
4. Low Quiescent Current: The device consumes minimal current (1.5µA typical) during normal operation, conserving power in battery-powered applications.

Advantages and Disadvantages

Advantages

• Accurate voltage monitoring and reset functionality.
• Low quiescent current consumption.
• Adjustable reset timeout period.
• Wide operating temperature range.

Disadvantages

• Limited voltage range (1.0V to 6.0V).
• Fixed threshold voltage (4.63V).

Working Principles

The LM809M3-4.63 operates by comparing the input voltage with the fixed threshold voltage. When the input voltage falls below the threshold, the reset output becomes active low, indicating a voltage fault condition. The reset signal remains active for a user-defined timeout period after the voltage rises above the threshold, allowing the system to stabilize before resuming normal operation.

Application Field Plans

The LM809M3-4.63 finds applications in various electronic systems where reliable voltage monitoring and reset functionality are crucial. Some potential application fields include:

1. Microcontrollers and Microprocessors: Ensuring proper initialization and safe operation of these devices.
2. Communication Systems: Preventing data corruption or loss due to voltage fluctuations.
3. Industrial Control Systems: Providing fault detection and system reset capabilities.
4. Automotive Electronics: Monitoring critical voltage levels in automotive systems.
5. Battery-Powered Devices: Protecting batteries from over-discharge by initiating a shutdown when the voltage drops below a certain level.

Alternative Models

For those seeking alternative options, the following models can be considered:

1. LM809M3-4.38: Similar to LM809M3-4.63 but with a lower threshold voltage of 4.38V.
2. LM809M3-5.0: A variant with a fixed threshold voltage of 5.0V.
3. LM809M3-3.08: Another option with a lower threshold voltage of 3.08V.

These alternative models provide flexibility in choosing the appropriate voltage supervisor based on specific application requirements.

In conclusion, the LM809M3-4.63 is a voltage supervisor that offers accurate voltage monitoring and reset functionality. With its low quiescent current consumption and adjustable timeout period, it finds applications in various electronic systems. While it has some limitations, alternative models are available to cater to different voltage threshold needs.