MAX8891EXK18+T

Product Overview

• Category: Integrated Circuit (IC)
• Use: Power Management
• Characteristics: High Efficiency, Low Dropout Voltage, Small Package Size
• Package: 4mm x 4mm Thin QFN
• Essence: Voltage Regulator
• Packaging/Quantity: Tape and Reel, 3000 pieces per reel

Specifications

• Input Voltage Range: 2.7V to 5.5V
• Output Voltage Range: 1.8V
• Output Current: Up to 500mA
• Dropout Voltage: 120mV at 500mA
• Quiescent Current: 45µA
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The MAX8891EXK18+T has the following pin configuration:

1. VIN: Input Voltage
2. GND: Ground
3. EN: Enable Pin
4. FB: Feedback Pin
5. VOUT: Output Voltage
6. BYP: Bypass Capacitor Pin

Functional Features

• High efficiency voltage regulation
• Low dropout voltage for improved power efficiency
• Thermal shutdown protection
• Short-circuit current limiting
• Low quiescent current for power-saving operation
• Enable pin for easy on/off control

Advantages and Disadvantages

Advantages: - High efficiency results in reduced power consumption - Low dropout voltage ensures stable output even with low input voltage - Small package size allows for space-saving designs - Thermal shutdown protection prevents damage from overheating - Short-circuit current limiting protects the circuit from excessive current

Disadvantages: - Limited output current of up to 500mA may not be sufficient for high-power applications - Input voltage range is limited to 2.7V to 5.5V

Working Principles

The MAX8891EXK18+T is a voltage regulator IC that takes an input voltage within the specified range and provides a stable output voltage of 1.8V. It achieves high efficiency by minimizing the dropout voltage, which is the difference between the input and output voltages.

The device uses a feedback mechanism to regulate the output voltage. The FB pin is connected to a resistive voltage divider network, which compares the output voltage with a reference voltage. Any deviation from the desired output voltage is corrected by adjusting the internal circuitry.

The enable pin (EN) allows for easy on/off control of the regulator. When the EN pin is low, the regulator is disabled, reducing power consumption to a minimum.

Detailed Application Field Plans

The MAX8891EXK18+T is commonly used in various applications where a stable 1.8V voltage supply is required. Some typical application fields include:

1. Mobile Devices: Smartphones, tablets, portable media players
2. Wearable Electronics: Fitness trackers, smartwatches
3. IoT Devices: Sensors, wireless modules
4. Battery-Powered Systems: Portable medical devices, handheld instruments
5. Automotive Electronics: Infotainment systems, navigation devices

Detailed and Complete Alternative Models

1. MAX8890: Similar voltage regulator with adjustable output voltage
2. MAX8892: Higher output current version with up to 1A capability
3. MAX8893: Dual-output voltage regulator for powering multiple components
4. MAX8894: Low quiescent current variant for ultra-low power applications
5. MAX8895: Step-down converter with integrated power switches

These alternative models offer different features and capabilities to suit specific requirements in various applications.

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