MAX1771ESA+ - English Editing Encyclopedia Entry

Product Overview

Category: Integrated Circuits (ICs)

Use: The MAX1771ESA+ is a high-efficiency, step-up DC-DC converter designed for battery-powered applications. It provides a regulated output voltage from a single-cell or dual-cell NiCd/NiMH or alkaline battery pack.

Characteristics: - High efficiency - Low quiescent current - Adjustable output voltage - Overload and short-circuit protection - Thermal shutdown protection

Package: The MAX1771ESA+ is available in an 8-pin SOIC (Small Outline Integrated Circuit) package.

Essence: The MAX1771ESA+ is an essential component in portable electronic devices that require a higher voltage than the battery can provide.

Packaging/Quantity: The MAX1771ESA+ is typically sold in reels of 2500 units.

Specifications

• Input Voltage Range: 0.8V to 12V
• Output Voltage Range: 2.5V to 16V
• Maximum Output Current: 500mA
• Switching Frequency: 100kHz to 600kHz
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The MAX1771ESA+ has the following pin configuration:

1. GND (Ground)
2. SW (Switch)
3. FB (Feedback)
4. VCC (Supply Voltage)
5. EN (Enable)
6. SS/TR (Soft-Start/Tracking)
7. LX (Inductor Connection)
8. COMP (Compensation)

Functional Features

• High Efficiency: The MAX1771ESA+ utilizes a synchronous rectifier to achieve high efficiency, minimizing power loss.
• Low Quiescent Current: The device features a low quiescent current, reducing power consumption during standby or idle periods.
• Adjustable Output Voltage: The output voltage can be adjusted using an external resistor divider, providing flexibility in various applications.
• Overload and Short-Circuit Protection: The MAX1771ESA+ incorporates protection mechanisms to prevent damage from overload or short-circuit conditions.
• Thermal Shutdown Protection: In case of excessive temperature, the device automatically shuts down to prevent overheating.

Advantages and Disadvantages

Advantages: - High efficiency leads to longer battery life. - Adjustable output voltage allows for compatibility with different devices. - Overload and short-circuit protection ensure safety and reliability. - Low quiescent current reduces power consumption during standby.

Disadvantages: - Limited maximum output current (500mA) may not be suitable for high-power applications. - Operating temperature range (-40°C to +85°C) may restrict usage in extreme environments.

Working Principles

The MAX1771ESA+ operates as a step-up DC-DC converter. It uses a pulse-width modulation (PWM) control scheme to regulate the output voltage. The input voltage is boosted by a power switch and stored in an inductor. The energy is then transferred to the output capacitor through a diode, resulting in a higher output voltage.

Detailed Application Field Plans

The MAX1771ESA+ finds applications in various battery-powered devices, including: - Portable electronic devices (e.g., smartphones, tablets) - Handheld gaming consoles - Wireless communication devices - Battery-powered medical equipment - Portable audio players

Detailed and Complete Alternative Models

1. LT1308CS8#PBF - Step-Up DC-DC Converter, 500kHz Switching Frequency, 12V Maximum Input Voltage, 5V to 12V Adjustable Output Voltage.
2. TPS61200DRCT - High-Efficiency Step-Up DC-DC Converter, 1.8V to 5.5V Input Voltage Range, 3.3V Fixed Output Voltage, 400mA Maximum Output Current.

These alternative models offer similar functionality and can be considered as substitutes for the MAX1771ESA+ in specific applications.

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