LTC3869EUFD#TRPBF Integrated Circuits (ICs)

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The LTC3869EUFD#TRPBF is part of the PMIC – Voltage Regulators – DC DC Switching Controllers family. It is a low-cost controller designed to regulate a wide range of current and input voltages. It acts as a PWM controller and provides phase-shift current mode control without relying on external components. This makes it easy to implement and enhance system efficiency. It is suitable for a variety of applications, such as powering server, telecom and industrial systems, as well as electric vehicles.

Overview

The LTC3869EUFD#TRPBF is a 2-phase synchronous Buck controller. It integrates efficient and reliable power-conversion circuitry and features a wide operating frequency range of 300 kHz to 1.3 MHz. It has an input voltage range of 0.8V to 8.5V which makes it compatible with a wide range of power sources. The controller is capable of delivering up to 25A of output current. In addition, it features a peak current mode control architecture, which ensures fast transient response, better load regulation and improved EMI performance. It also offers a wide variety of integrated features, such as pre-bias start-up, external compensation, cycle-by-cycle current limit, and adjustable soft-start/soft-stop.

Working Principle

The LTC3869EUFD#TRPBF is based on peak current-mode control. This architecture eliminates the need for an external compensation network, allowing it to regulate supply rail voltages accurately with minimal component count. It also offers the advantage of extended frequency range and improved dynamic performance, allowing fast transient response to changes in load and input voltage. The device uses a Pulse Width Modulated (PWM) switching control method at a wide frequency range. It works by using a pair of driver outputs to control two external power switches that simultaneously switch on and off in opposite directions. This process creates a current-mode sine wave that is sampled by an internal comparator and adjusted to ensure output regulation. The device uses an internal current-sense circuit that produces a differential pulse-width modulation (PWM) signal, which is compared against a voltage reference to regulate the output voltage. Additionally, the device features an over-temperature protection, adjustable current limit, fast transient response and programmable features via an I2C-bus.

Applications

The LTC3869EUFD#TRPBF is ideal for powering a variety of applications, such as enterprise, telecom and industrial systems, as well as electric vehicles. It is designed to deliver a clean, regulated output over a wide range of voltages and currents. Its integrated features and wide input and output range make it suitable for a variety of power conversion applications. It can be used in battery-operated or isolated power supplies, point-of-load (POL) applications and wide-input range power systems, making it a reliable and economical solution for many electronic systems. Moreover, its high-frequency operation helps minimize component size, while its current-mode control ensures fast protective action and improved EMI performance.

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