MAX8940EXK28+T

Product Overview

• Category: Integrated Circuit (IC)
• Use: Power Management
• Characteristics: High Efficiency, Low Power Consumption
• Package: 28-Pin Exposed Pad TQFN
• Essence: Voltage Regulator
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Input Voltage Range: 2.7V to 5.5V
• Output Voltage Range: 0.6V to 3.3V
• Maximum Output Current: 1.5A
• Quiescent Current: 30µA
• Switching Frequency: 2MHz
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The MAX8940EXK28+T has a total of 28 pins. The pin configuration is as follows:

1. VIN: Input Voltage
2. GND: Ground
3. EN: Enable Pin
4. FB: Feedback Pin
5. SS/TR: Soft-Start/Tracking Pin
6. PGND: Power Ground
7. LX: Switch Node
8. BST: Boost Capacitor Connection
9. VOUT: Output Voltage
10. AGND: Analog Ground
11. COMP: Compensation Pin
12. SS/TR: Soft-Start/Tracking Pin
13. PGND: Power Ground
14. LX: Switch Node
15. BST: Boost Capacitor Connection
16. VOUT: Output Voltage
17. AGND: Analog Ground
18. COMP: Compensation Pin
19. SS/TR: Soft-Start/Tracking Pin
20. PGND: Power Ground
21. LX: Switch Node
22. BST: Boost Capacitor Connection
23. VOUT: Output Voltage
24. AGND: Analog Ground
25. COMP: Compensation Pin
26. SS/TR: Soft-Start/Tracking Pin
27. PGND: Power Ground
28. LX: Switch Node

Functional Features

The MAX8940EXK28+T is a high-efficiency voltage regulator IC designed for power management applications. It offers the following functional features:

1. Wide input voltage range allows for versatile use in various electronic devices.
2. High output current capability of 1.5A enables it to power multiple components simultaneously.
3. Low quiescent current ensures minimal power consumption during standby or idle modes.
4. Switching frequency of 2MHz provides fast response and efficient power conversion.
5. Enable pin allows for easy control of the regulator's operation.
6. Soft-start/tracking pin enables smooth startup and tracking of the output voltage.
7. Integrated compensation circuitry simplifies external component requirements.

Advantages and Disadvantages

Advantages: - High efficiency leads to reduced power dissipation and longer battery life. - Wide input voltage range enhances compatibility with different power sources. - Compact package size saves board space in electronic designs. - Integrated compensation circuitry simplifies external component selection and reduces design complexity.

Disadvantages: - Limited maximum output current may not be suitable for high-power applications. - Operating temperature range may restrict usage in extreme environmental conditions. - Lack of built-in protection features may require additional external circuitry for overcurrent or overvoltage protection.

Working Principles

The MAX8940EXK28+T operates as a step-down (buck) voltage regulator. It takes an input voltage within the specified range and efficiently converts it to a lower, regulated output voltage. The internal switching circuitry controls the flow of current through the inductor, which stores and releases energy to maintain a stable output voltage. The feedback mechanism adjusts the duty cycle of the switching circuit to regulate the output voltage within the desired range.

Detailed Application Field Plans

The MAX8940EXK28+T finds applications in various electronic devices and systems, including but not limited to:

1. Portable electronic devices: Smartphones, tablets, portable media players.
2. Wearable devices: Smartwatches, fitness trackers, wireless earbuds.
3. IoT devices: Home automation systems, smart sensors, connected appliances.
4. Industrial equipment: Data loggers, measurement instruments, control systems.
5. Automotive electronics: Infotainment systems, navigation units, lighting controls.

Detailed and Complete Alternative Models

1. MAX8940EXK28+T-ND: Same specifications and features as MAX8940EXK28+T.
2. MAX8940EXK28+T-TR: Tape and reel packaging with 3000 units per reel.
3. MAX8940EXK28+T-GP: General purpose version with wider temperature range (-40°C to +125°C).

These alternative models offer similar functionality and characteristics, providing flexibility for different application requirements.

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