LTC2931CF#PBF

Product Overview

Category: Integrated Circuit (IC)

Use: Power Supply Monitor and Reset Circuit

Characteristics: - Monitors the power supply voltage and generates a reset signal when the voltage falls below a specified threshold - Ensures proper system initialization and prevents erratic behavior during power-up and power-down - Provides a reliable and stable power-on reset (POR) function

Package: 16-Lead TSSOP

Essence: The LTC2931CF#PBF is an integrated circuit designed to monitor the power supply voltage in electronic systems and generate a reset signal when necessary. It ensures the proper functioning of the system during power transitions.

Packaging/Quantity: The LTC2931CF#PBF is available in a 16-Lead Thin Shrink Small Outline Package (TSSOP). It is typically sold in reels or tubes containing multiple units.

Specifications

• Supply Voltage Range: 2.7V to 5.5V
• Threshold Voltage Accuracy: ±1.5%
• Reset Timeout Period: Adjustable from 100ms to 10s
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The LTC2931CF#PBF has 16 pins arranged as follows:

```

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| | --| VCC GND |-- Power Supply Pins --| MR RST |-- Reset Output Pin --| TH GND |-- Threshold Input Pin --| ... |-- Other Pins |___________| ```

Functional Features

1. Power Supply Monitoring: The LTC2931CF#PBF continuously monitors the input power supply voltage.
2. Threshold Detection: It compares the monitored voltage with a user-defined threshold voltage.
3. Reset Signal Generation: When the monitored voltage falls below the threshold, the LTC2931CF#PBF generates a reset signal.
4. Adjustable Timeout Period: The reset signal remains active for a user-adjustable period to ensure proper system initialization.
5. Low Power Consumption: The IC operates with low power consumption, minimizing its impact on overall system energy efficiency.

Advantages and Disadvantages

Advantages: - Ensures reliable system initialization during power-up - Prevents erratic behavior caused by unstable power supply voltage - Adjustable timeout period allows customization for specific applications - Low power consumption minimizes energy usage

Disadvantages: - Limited to monitoring and resetting functions only - Requires an external power supply for operation

Working Principles

The LTC2931CF#PBF works by continuously monitoring the input power supply voltage using an internal voltage comparator. It compares the monitored voltage with the threshold voltage set by the user. When the monitored voltage falls below the threshold, the IC generates a reset signal. The reset signal remains active for a user-adjustable period, ensuring proper system initialization. The IC operates with low power consumption, making it suitable for battery-powered applications.

Application Field Plans

The LTC2931CF#PBF is commonly used in various electronic systems where reliable power supply monitoring and reset functionality are crucial. Some application fields include:

1. Embedded Systems: Used in microcontroller-based systems to ensure proper initialization and prevent erratic behavior during power transitions.
2. Industrial Automation: Employed in industrial control systems to monitor power supply integrity and provide stable reset signals for critical components.
3. Telecommunications: Integrated into communication equipment to ensure uninterrupted operation and prevent system malfunctions due to power fluctuations.
4. Automotive Electronics: Utilized in automotive applications to monitor the vehicle's power supply and generate reset signals when necessary, enhancing system reliability.

Alternative Models

1. LTC2932CF#PBF: Similar to LTC2931CF#PBF with additional features such as adjustable hysteresis and watchdog timer functionality.
2. MAX823TUK+: Power supply monitor and reset circuit from Maxim Integrated with similar characteristics and package.
3. TPS3808G01DBVR: Texas Instruments' power supply supervisor IC offering comparable functionality in a different package.

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