LTC3455EUF#PBF

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The LTC3455EUF#PBF is a specialized power management integrated circuit (PMIC) from Linear Technology. Specifically, it is a synchronous buck step-down switch-mode voltage regulator. Its topology works similarly to a linear regulator, but with a higher efficiency. The LTC3455EUF#PBF is optimized for use in applications such as portable instrumentation and digital power supplies for low power applications.

The LTC3455EUF#PBF integrates a 2-phase synchronous buck regulator, an adjustable linear regulator, two low quiescent current linear regulators, and two low on resistance pass transistors. It operates over the -40°C to +85°C junction temperature range. The switch mode regulator has a quiescent current of 170uA and an adjustable switching frequency up to 3MHz. Output current capability is 5A (12V/3A), and output voltage range is adjustable down to as low as 0.8V. It also features overvoltage, undervoltage, overcurrent, and overtemperature protection.

The LTC3455EUF#PBF can be used to step down the voltage of a power supply to regulate the voltage output. The topology used operates similarly to a linear regulator, with a few key differences. Rather than just dissipating the extra current in waste heat, the LTC3455EUF#PBF uses a switch mode topology that switches the extra current back and forth between the input and output. This low noise, high efficiency conversion (typically over 90%) makes the LTC3455EUF#PBF ideal for low power applications.

The LTC3455EUF#PBF is designed to be used in conjunction with external components such as pass transistors, filtering caps, and feedback networks. Depending on the application, the linear regulator can be configured to provide a fixed output voltage with either feedback or resistor divider, or to provide adjustable output voltage with voltage feedback. Additionally, while the switch-mode regulators require an external inductor, the LTC3455EUF#PBF can be used without an inductor in single inductor applications.

In summary, the LTC3455EUF#PBF is a specialized power management integrated circuit (PMIC) from Linear Technology, optimized for use in low power applications. It integrates a 2-phase synchronous buck regulator, an adjustable linear regulator, two low quiescent current linear regulators, and two low on resistance pass transistors. The switch mode regulator has a quiescent current of 170uA, and an adjustable switching frequency up to 3MHz. Output current capacity is 5A (12V/3A), and output voltage range is adjustable down to as low as 0.8V. With its adjustable output voltage and high efficiency capability, the LTC3455EUF#PBF is an ideal solution for applications such as portable instrumentation and digital power supplies.

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