LTC2900-1IDD#PBF

Product Overview

Category

The LTC2900-1IDD#PBF belongs to the category of integrated circuits (ICs) and specifically falls under the family of supervisory circuits.

Use

This product is primarily used for monitoring and controlling power supply voltages in electronic systems. It ensures proper operation by providing accurate voltage monitoring, power-on reset generation, and watchdog timer functions.

Characteristics

• Accurate voltage monitoring: The LTC2900-1IDD#PBF offers precise monitoring of power supply voltages, ensuring that they remain within specified limits.
• Power-on reset generation: It generates a reset signal upon power-up, ensuring a controlled start-up sequence for the system.
• Watchdog timer function: The device includes a watchdog timer that monitors the system's activity and resets it if necessary.

Package

The LTC2900-1IDD#PBF is available in a small 8-lead DFN (Dual Flat No-Lead) package. This package provides excellent thermal performance and compact size, making it suitable for space-constrained applications.

Essence

The essence of the LTC2900-1IDD#PBF lies in its ability to ensure reliable and stable operation of electronic systems by monitoring power supply voltages and generating appropriate reset signals.

Packaging/Quantity

The product is typically sold in reels or tubes containing a specific quantity of units. The exact packaging and quantity may vary depending on the supplier and customer requirements.

Specifications

• Supply Voltage Range: 2.7V to 6V
• Operating Temperature Range: -40°C to 85°C
• Voltage Monitoring Accuracy: ±1.5%
• Reset Threshold Options: Adjustable or Fixed
• Watchdog Timer Timeout Period: Configurable
• Quiescent Current: 10μA (typical)

Detailed Pin Configuration

The LTC2900-1IDD#PBF features the following pin configuration:

1. GND: Ground connection
2. VCC: Power supply input
3. MR: Manual reset input
4. RESET: Reset output
5. WDI: Watchdog timer input
6. ADJ: Voltage monitor threshold adjustment
7. TH: Voltage monitor threshold selection
8. NC: No connection

Functional Features

Voltage Monitoring

The LTC2900-1IDD#PBF continuously monitors the power supply voltage using the ADJ and TH pins. It compares the monitored voltage with a programmable threshold to determine if it is within acceptable limits.

Power-On Reset Generation

Upon power-up, the LTC2900-1IDD#PBF generates a reset signal that remains active until the power supply voltage stabilizes. This ensures a controlled start-up sequence for the system.

Watchdog Timer

The device includes a watchdog timer that requires periodic activation through the WDI pin. If the watchdog timer is not refreshed within the configured timeout period, it generates a reset signal, preventing system lock-ups.

Advantages and Disadvantages

Advantages

• Accurate voltage monitoring ensures reliable system operation.
• Power-on reset generation prevents erratic behavior during start-up.
• Watchdog timer functionality enhances system reliability by detecting and recovering from software or hardware failures.
• Small package size allows for space-efficient integration into electronic systems.

Disadvantages

• Limited to monitoring power supply voltages only; does not provide additional supervisory functions.
• Requires external components for voltage threshold adjustment and watchdog timer configuration.

Working Principles

The LTC2900-1IDD#PBF operates by comparing the power supply voltage with a user-configurable threshold. If the voltage falls below the threshold, indicating a potential fault condition, the device generates a reset signal. Additionally, the watchdog timer must be periodically refreshed to prevent system lock-ups.

Detailed Application Field Plans

The LTC2900-1IDD#PBF finds applications in various electronic systems where reliable power supply monitoring and control are critical. Some potential application fields include:

1. Industrial Control Systems: Ensuring stable operation of control systems in manufacturing plants and industrial automation.
2. Automotive Electronics: Monitoring power supply voltages in automotive ECUs (Electronic Control Units) to prevent malfunctions.
3. Medical Devices: Providing voltage supervision in medical equipment to ensure patient safety and proper functioning.
4. Telecommunications: Monitoring power supplies in communication infrastructure to maintain uninterrupted service.
5. Consumer Electronics: Enhancing the reliability of consumer electronic devices by monitoring power supply voltages.

Detailed and Complete Alternative Models

1. LTC2900-2IDD#PBF: Similar to LTC2900-1IDD#PBF, but with two voltage monitor inputs for monitoring multiple power supply voltages simultaneously.
2. MAX809: An alternative supervisory circuit from Maxim Integrated, offering similar functionality and features.
3. TPS3839: Texas Instruments' supervisory circuit with adjustable reset threshold and watchdog timer capabilities.

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