LM2677SDX-3.3

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The LM2677SDX-3.3 is a DC-DC switching regulator from Texas Instruments that has many useful applications. It is part of the PMIC – Voltage Regulators – DC DC Switching Regulators category. It is designed to provide a complete power management solution that is low noise with maximum flexibilities, making it ideal for many applications such as synchronous step-down converters, LCD bias, pre-regulators and active clamping. It can also be used in systems requiring multiple voltage rails with just one regulator.

The LM2677SDX-3.3 is capable of delivering up to 3.3 A continuous current and provides fast transient response. It employs a synchronous rectified buck topology, which can be configured for either Pulse Width Modulated (PWM) or Pulse Frequency Modulated (PFM) operation. The device includes controlled on-time, a power good output and a current limit circuit, making it a robust solution for many power management applications.

The LM2677SDX-3.3 can operate in PWM mode to provide a regulated output voltage with excellent line and load regulation. During PWM mode of operation, the output voltage is proportional to the reference voltage and the duty cycle. Furthermore, the device has a low noise output, making it suitable for low noise applications such as powering audio systems or RF circuits.

In PFM mode, the device operates in Burst Mode™, reducing the average current and maximizing system efficiency over light and heavy load current conditions. The device enters and exits the operating state based on a signal from the current-limit comparator and the error amplifier, and it adjusts the pulse width for each output pulse accordingly.

The LM2677SDX-3.3 includes an adjustable soft-start feature that allows the output voltage to slowly ramp up to its steady-state voltage, reducing inrush current and preventing damage to power delivery components during power-up. It also features a power-good circuit which utilizes an output voltage comparator to detect the output voltage. If the output falls below the power-good voltage threshold, the power-good output will go low and notify the system that the output is low and to shut down power management before it gets any worse.

Overall, the LM2677SDX-3.3 is an ideal power management solution for many applications requiring a reliable, low noise, low cost and flexible DC-DC switching regulator. It is capable of delivering up to 3.3A and includes adjustable soft-start and a power-good features, making sure it is a robust solution for many power management applications.

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