TPS3837K33DBVT

Overview

Category: Integrated Circuits (ICs)

Use: Voltage Supervisor

Characteristics: - Low Power Consumption - Wide Operating Voltage Range - Adjustable Reset Threshold - Manual Reset Input - Power-On Reset Delay Time - Watchdog Timer - Open Drain Output - Small Package Size

Package: SOT-23-5

Essence: The TPS3837K33DBVT is a voltage supervisor IC that monitors the power supply voltage of a system and provides a reset signal to the microcontroller or other digital devices when the voltage drops below a certain threshold.

Packaging/Quantity: The TPS3837K33DBVT is available in a small SOT-23-5 package. It is typically sold in reels of 3000 units.

Specifications

• Supply Voltage Range: 1.8V to 10V
• Reset Threshold Voltage: Adjustable from 2.93V to 3.08V
• Reset Timeout Period: 200ms (typical)
• Quiescent Current: 1.5µA (typical)
• Operating Temperature Range: -40°C to +125°C

Pin Configuration

The TPS3837K33DBVT has the following pin configuration:

____ VDD| | GND| | RESET| | N/C| | VOUT|____|

• VDD: Supply Voltage
• GND: Ground
• RESET: Reset Output
• N/C: No Connection
• VOUT: Power-On Reset Output

Functional Features

1. Voltage Monitoring: The TPS3837K33DBVT continuously monitors the supply voltage and asserts the reset output when it falls below the set threshold.
2. Adjustable Reset Threshold: The reset threshold voltage can be adjusted within a specific range to suit different system requirements.
3. Manual Reset Input: A manual reset input pin allows for an external signal to force a system reset.
4. Power-On Reset Delay Time: The IC provides a delay time after power-on before asserting the reset output, allowing the system to stabilize.
5. Watchdog Timer: The TPS3837K33DBVT includes a watchdog timer that can be used to monitor the system's operation and generate a reset if necessary.
6. Open Drain Output: The reset output is an open drain configuration, allowing it to be connected to other devices with different supply voltages.
7. Low Power Consumption: The IC has low quiescent current, making it suitable for battery-powered applications.

Advantages and Disadvantages

Advantages: - Wide operating voltage range - Adjustable reset threshold - Low power consumption - Small package size - Manual reset input for flexibility - Power-on reset delay for stability - Watchdog timer for system monitoring

Disadvantages: - Limited number of pins for additional functionality - Not suitable for high-voltage applications

Working Principles

The TPS3837K33DBVT operates by comparing the supply voltage with the set threshold voltage. When the supply voltage drops below the threshold, the reset output is asserted, indicating a power failure or unstable voltage condition. The reset output remains active until the supply voltage rises above the threshold and the reset timeout period elapses.

The adjustable reset threshold allows the IC to be configured for different voltage levels, ensuring compatibility with various systems. The power-on reset delay provides a stable power-up sequence by delaying the assertion of the reset output after power is applied.

The watchdog timer monitors the system's operation by periodically resetting a counter. If the counter is not reset within a specified time, indicating a fault or system hang, the watchdog timer generates a reset signal.

Detailed Application Field Plans

The TPS3837K33DBVT is commonly used in various applications where reliable voltage monitoring and system reset functionality are required. Some of the typical application fields include:

1. Microcontrollers: The IC ensures proper operation of microcontrollers by providing a reset signal when the supply voltage drops below a certain threshold.
2. Embedded Systems: It is widely used in embedded systems to monitor power supply integrity and initiate a system reset if necessary.
3. Battery-Powered Devices: The low power consumption and adjustable threshold make it suitable for battery-powered devices, such as portable electronics and IoT devices.
4. Industrial Control Systems: The IC plays a crucial role in industrial control systems, ensuring stable operation and preventing data corruption during power fluctuations.
5. Automotive Electronics: It is utilized in automotive electronics to monitor the vehicle's electrical system and trigger a reset in case of voltage irregularities.

Detailed and Complete Alternative Models

1. TPS3836: Similar to TPS3837K33DBVT but with a fixed