LM2677SX-5.0/NOPB Integrated Circuits (ICs)

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The LM2677SX-5.0/NOPB is a member of TI\'s switching regulator family, and it is a versatile DC to DC converter. Its internal short-circuit protection and thermal shutdown circuit make it ideal for use in fixed-frequency and multiple-output step up applications.

Features

• High Efficiency Synchronous Step Up: Up to 97% efficiency
• Adaptive Current Mode Control: Fast transient response and low noise operation
• Output Voltage Range: Adjustable from 3.3 V to 36 V
• Maximum Output Current: Up to 5 A
• Selectable Switching Frequency: Up to 2.2 MHz
• Over Current and Thermal Shut Down: Provides protection against output overloads and thermal runaway conditions
• Internal Power MOSFET: Provides up to 5 A output current

Applications

• Portable electronic devices, such as cell phones and PDAs.
• DC - DC Converters, as well as Battery Chargers.
• Automotive electronics, such as audio and infotainment systems.
• Power management for industrial, telecom, and instrumentation systems.
• Home automation and home theatre systems.
• Any other system that requires efficient DC-DC power conversion.

Working Principle

The LM2677SX-5.0/NOPB uses a current-mode control topology, which is ideal for tracking rapid load changes. In this method of control, the output voltage of the converter is regulated and kept at a constant level by controlling the current through the power MOSFET and varying the switching frequency.

The LM2677SX-5.0/NOPB has an adjustable output voltage range of 3.3V to 36V and can provide up to 5A of output current at a switching frequency of up to 2.2MHz. The output can be easily adjusted by adjusting the resistive divider, which places the feedback voltage at the negative input of the error amplifier, thereby controlling the output voltage. The device also features internal protection circuits such as over-current, over-temperature and short-circuit protection.

In summary, the LM2677SX-5.0/NOPB is an efficient, high performance DC-DC converter that is suitable for use in a variety of applications. Its adjustable output voltage, high switching frequency and internal protection circuits make it an ideal candidate for any application requiring step up conversion.

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