LTC2909IDDB-2.5#TRM

Overview

Product Category: Integrated Circuit (IC)

Use: The LTC2909IDDB-2.5#TRM is a voltage supervisor and watchdog timer IC designed for monitoring the power supply voltage in various electronic systems.

Characteristics: - Voltage Monitoring: The LTC2909IDDB-2.5#TRM can monitor a wide range of input voltages, making it suitable for different applications. - Watchdog Timer: It includes a built-in watchdog timer that can reset the system if a fault or malfunction occurs. - Low Power Consumption: This IC operates with low power consumption, making it ideal for battery-powered devices. - Small Package Size: The LTC2909IDDB-2.5#TRM comes in a small DFN package, allowing for space-efficient integration into electronic circuits. - High Accuracy: It provides accurate voltage monitoring and precise timing functions.

Package: The LTC2909IDDB-2.5#TRM is available in a 6-pin DFN package.

Essence: The essence of the LTC2909IDDB-2.5#TRM is to ensure the stability and reliability of electronic systems by monitoring the power supply voltage and providing a watchdog timer function.

Packaging/Quantity: The LTC2909IDDB-2.5#TRM is typically sold in reels containing a quantity of 2500 units per reel.

Specifications

• Input Voltage Range: 1.5V to 6V
• Threshold Voltage Accuracy: ±1.5%
• Watchdog Timer Timeout Period: Adjustable from 10ms to 640ms
• Operating Temperature Range: -40°C to +85°C
• Supply Current: 20µA (typical)
• Output Type: Active Low

Pin Configuration

The LTC2909IDDB-2.5#TRM has the following pin configuration:

1. GND: Ground connection
2. VIN: Input voltage to be monitored
3. VCC: Power supply for the IC
4. RESET: Active low reset output
5. WDI: Watchdog input
6. GATE: Gate control input

Functional Features

The LTC2909IDDB-2.5#TRM offers the following functional features:

1. Voltage Monitoring: Monitors the input voltage and generates a reset signal if it falls below or exceeds the specified threshold.
2. Watchdog Timer: Provides a watchdog timer function to detect system malfunctions or failures. If the watchdog input is not toggled within the set timeout period, a reset signal is generated.
3. Adjustable Timeout Period: The watchdog timer's timeout period can be adjusted according to the specific requirements of the application.
4. Manual Reset: The IC includes a manual reset input that allows for an external reset signal to be applied.
5. Power-On Reset: Generates a reset signal upon power-up to ensure proper initialization of the system.

Advantages and Disadvantages

Advantages: - Wide input voltage range allows for versatile applications. - Accurate voltage monitoring ensures system stability. - Low power consumption prolongs battery life in portable devices. - Small package size enables space-efficient integration. - Adjustable watchdog timer timeout period provides flexibility.

Disadvantages: - Limited number of pins may restrict the functionality in complex systems. - Lack of built-in protection features against voltage spikes or transients.

Working Principles

The LTC2909IDDB-2.5#TRM operates by continuously monitoring the input voltage using an internal voltage reference. It compares the input voltage with the programmable threshold voltage. If the input voltage falls below or exceeds the threshold, a reset signal is generated. Additionally, the watchdog timer monitors the WDI input for toggling within the set timeout period. If no toggling occurs, a reset signal is generated to prevent system malfunctions.

Application Field Plans

The LTC2909IDDB-2.5#TRM finds applications in various electronic systems where voltage monitoring and watchdog timer functions are crucial. Some potential application fields include:

1. Power Supply Monitoring: Ensuring stable power supply voltages in computer systems, servers, and telecommunications equipment.
2. Industrial Control Systems: Monitoring voltage levels in control panels, motor drives, and PLCs to prevent damage due to voltage fluctuations.
3. Automotive Electronics: Monitoring battery voltage and protecting sensitive electronic components from overvoltage or undervoltage conditions.
4. Medical Devices: Ensuring reliable power supply voltages in medical equipment to avoid malfunctions that could compromise patient safety.
5. Consumer Electronics: Protecting sensitive circuits in smartphones, tablets, and gaming consoles from voltage-related issues.

Alternative Models

Some alternative models to the LTC2909IDDB-2.5#TRM with similar functionalities include: - MAX809: Voltage supervisor and watchdog timer IC from Maxim Integrated