MAX821TUS+T

Product Overview

• Category: Integrated Circuit
• Use: Voltage Monitor
• Characteristics: Low Power, Precision, Adjustable Threshold
• Package: SOT-23-3
• Essence: Monitors voltage levels and provides a digital output based on the threshold set by the user.
• Packaging/Quantity: Tape & Reel, 3000 units per reel

Specifications

• Supply Voltage Range: 1.8V to 5.5V
• Threshold Voltage Range: Adjustable from 1.2V to VDD-0.6V
• Operating Temperature Range: -40°C to +85°C
• Quiescent Current: 1µA (typical)
• Output Type: Active-Low Open-Drain
• Accuracy: ±1.5% (typical)

Pin Configuration

The MAX821TUS+T has three pins in the SOT-23-3 package:

1. GND: Ground connection
2. IN: Input voltage to be monitored
3. OUT: Digital output indicating the voltage level

Functional Features

• Monitors the input voltage and compares it with the user-adjustable threshold.
• Provides an active-low open-drain output that indicates whether the input voltage is above or below the threshold.
• Low quiescent current makes it suitable for battery-powered applications.
• Adjustable threshold allows flexibility in setting the desired voltage level.

Advantages

• Wide supply voltage range enables compatibility with various systems.
• Low power consumption prolongs battery life in portable devices.
• Precise voltage monitoring ensures accurate system operation.
• Small package size saves board space.
• Adjustable threshold provides customization options.

Disadvantages

• Limited number of pins restricts additional functionality.
• Lack of built-in hysteresis may lead to output oscillations near the threshold voltage.

Working Principles

The MAX821TUS+T operates by comparing the input voltage with the threshold voltage set by the user. When the input voltage exceeds the threshold, the digital output (OUT) is pulled low. Conversely, when the input voltage falls below the threshold, the output remains high impedance. The adjustable threshold allows the user to define the desired voltage level for monitoring.

Detailed Application Field Plans

• Battery-powered devices: Use the MAX821TUS+T to monitor battery voltage and trigger low-battery warnings or shutdowns.
• Power supply systems: Employ the IC to detect overvoltage or undervoltage conditions and activate protective measures.
• Industrial control systems: Utilize the voltage monitor to ensure stable operation of critical components and prevent damage due to voltage fluctuations.

Detailed and Complete Alternative Models

1. MAX823TUS+T: Similar to MAX821TUS+T but with a fixed threshold voltage of 2.5V.
2. MAX822TUS+T: Voltage monitor with a higher accuracy of ±0.5% but without an adjustable threshold.
3. MAX824TUS+T: Provides a push-pull output instead of an open-drain configuration.

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