MAX1674EUA+ - English Editing Encyclopedia Entry

Product Overview

Category: Integrated Circuits (ICs)

Use: The MAX1674EUA+ is a step-up DC-DC converter designed for low-power applications. It provides a regulated output voltage from a single lithium-ion (Li+) cell, or two NiCd/NiMH cells.

Characteristics: - Input Voltage Range: 0.7V to 5.5V - Output Voltage Range: 2.7V to 5.5V - Maximum Output Current: 100mA - Efficiency: Up to 90% - Shutdown Current: <1µA - Operating Temperature Range: -40°C to +85°C

Package: The MAX1674EUA+ is available in a small 8-pin µMAX package, which is ideal for space-constrained applications.

Essence: This IC is specifically designed to efficiently boost low input voltages to higher output voltages, making it suitable for battery-powered devices that require stable power supply.

Packaging/Quantity: The MAX1674EUA+ is typically sold in reels of 2500 units.

Specifications

The specifications of the MAX1674EUA+ are as follows:

• Input Voltage Range: 0.7V to 5.5V
• Output Voltage Range: 2.7V to 5.5V
• Maximum Output Current: 100mA
• Quiescent Current: 30µA (typical)
• Switching Frequency: 1MHz (typical)
• Shutdown Current: <1µA
• Operating Temperature Range: -40°C to +85°C
• Package Type: 8-pin µMAX

Detailed Pin Configuration

The MAX1674EUA+ has the following pin configuration:

1. SHDN - Shutdown Pin (Active Low)
2. GND - Ground
3. SW - Switching Node
4. FB - Feedback Pin
5. VOUT - Output Voltage
6. VIN - Input Voltage
7. NC - No Connection
8. VCC - Supply Voltage

Functional Features

The MAX1674EUA+ offers the following functional features:

• Step-up DC-DC conversion from low input voltage to higher output voltage.
• High efficiency, up to 90%, ensuring minimal power loss.
• Low quiescent current, reducing power consumption during standby or idle modes.
• Shutdown mode for further power savings when the device is not in use.
• Overcurrent and thermal protection for safe operation.

Advantages and Disadvantages

Advantages: - Wide input voltage range allows compatibility with various power sources. - Small package size enables space-saving integration into compact designs. - High efficiency minimizes wasted energy and extends battery life. - Shutdown mode reduces power consumption during periods of inactivity. - Overcurrent and thermal protection ensure safe operation.

Disadvantages: - Limited maximum output current may restrict its use in high-power applications. - The 8-pin µMAX package may require additional external components for certain circuit configurations.

Working Principles

The MAX1674EUA+ operates as a step-up DC-DC converter using a pulse-width modulation (PWM) control scheme. It utilizes an internal switch to regulate the output voltage based on the feedback received from the FB pin. When the input voltage is lower than the desired output voltage, the internal switch rapidly turns on and off, stepping up the voltage to the required level. The switching frequency is typically set at 1MHz, allowing for efficient power conversion.

Detailed Application Field Plans

The MAX1674EUA+ finds applications in various low-power electronic devices, including but not limited to: - Portable audio players - Handheld gaming consoles - Wireless communication devices - Battery-powered sensors - Wearable devices

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the MAX1674EUA+ are: - MAX1673EUA+: Similar specifications and pin configuration, but with a lower maximum output current of 50mA. - MAX1675EUA+: Higher maximum output current of 200mA, suitable for slightly higher power applications. - MAX1676EUA+: Adjustable output voltage range, allowing for greater flexibility in different applications.

These alternative models can be considered based on specific requirements and desired performance characteristics.

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