TPS3820-50DBVT

Product Overview

Category

The TPS3820-50DBVT belongs to the category of voltage supervisors.

Use

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

Characteristics

• Voltage supervision range: 2.5V to 6V
• Accuracy: ±1%
• Low quiescent current: 10µA (typical)
• Power-on reset delay time: 200ms (typical)
• Watchdog timer: 1.6s (typical)

Package

The TPS3820-50DBVT is available in a small SOT-23 package.

Essence

The essence of the TPS3820-50DBVT lies in its ability to provide reliable voltage monitoring and reset generation in various electronic applications.

Packaging/Quantity

The TPS3820-50DBVT is typically packaged in reels, with 3000 units per reel.

Specifications

• Supply voltage range: 2.5V to 6V
• Operating temperature range: -40°C to +85°C
• Reset threshold voltage: 4.63V (typical)
• Reset timeout period: 50ms to 1400ms (programmable)
• Power supply glitch immunity: 50ns (typical)
• Power-on reset delay time: 200ms (typical)
• Watchdog timer timeout period: 1.6s (typical)
• Quiescent current: 10µA (typical)

Detailed Pin Configuration

The TPS3820-50DBVT has the following pin configuration:

• Pin 1: GND (Ground)
• Pin 2: VDD (Supply Voltage)
• Pin 3: MR (Manual Reset)
• Pin 4: RESET (Reset Output)

Functional Features

1. Voltage Monitoring: The TPS3820-50DBVT continuously monitors the supply voltage and generates a reset signal when it falls below the specified threshold.
2. Power-On Reset: It provides a power-on reset delay to ensure stable operation during power-up.
3. Watchdog Timer: The device includes a watchdog timer that resets the system if it fails to receive a periodic input within the specified timeout period.
4. Manual Reset: The TPS3820-50DBVT allows for manual reset by asserting the MR pin.

Advantages and Disadvantages

Advantages

• Wide operating voltage range
• Low quiescent current consumption
• Accurate voltage monitoring
• Programmable reset timeout period
• Small package size

Disadvantages

• Limited number of programmable options
• Lack of advanced features compared to some alternative models

Working Principles

The TPS3820-50DBVT operates by comparing the supply voltage with a fixed threshold voltage. When the supply voltage drops below the threshold, the reset output is asserted, indicating a power failure or an out-of-range condition. The power-on reset delay ensures that the reset output remains active for a specific period after power-up to allow the system to stabilize. The watchdog timer monitors the system's activity and generates a reset signal if it does not receive a periodic input within the defined timeout period.

Detailed Application Field Plans

The TPS3820-50DBVT finds applications in various electronic systems where reliable voltage monitoring and reset generation are critical. Some potential application fields include:

1. Microcontrollers and Microprocessors: Ensuring proper system initialization and preventing erratic behavior during power-up.
2. Industrial Control Systems: Providing fault detection and recovery mechanisms in industrial automation equipment.
3. Automotive Electronics: Monitoring the vehicle's electrical system to prevent damage due to voltage fluctuations.
4. Power Supply Units: Protecting sensitive electronic components from voltage drops and surges.
5. Battery-Powered Devices: Extending battery life by implementing power-saving strategies based on voltage monitoring.

Detailed and Complete Alternative Models

1. TPS3820-33DBVT: Similar to TPS3820-50DBVT, but with a different reset threshold voltage of 3.3V.
2. TPS3820-25DBVT: Similar to TPS3820-50DBVT, but with a different reset threshold voltage of 2.5V.
3. TPS3839K33DBVR: A voltage supervisor with additional features like adjustable reset timeout period and watchdog timer disable option.

These alternative models offer similar functionality with slight variations in specifications to cater to specific application requirements.

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