LTC3878EGN#TRPBF

The LTC3878EGN#TRPBF is an advanced current mode DC/DC controller that regulates the power supply voltage. Its adjustable switching frequency, current and voltage mode control, fast transient response and external compensation capability, allow the device to be used in a wide range of applications, including microprocessor systems, communications systems and distributed power architectures.

Application Field

The LTC3878EGN#TRPBF can be used in a variety of applications, including microprocessor systems, communications systems, distributed power architectures and industrial power supplies. It is suitable for use in high current applications, where the device’s switching frequency is adjustable from 20kHz to 1MHz. The part is designed to operate from a 4.5V to 28V input voltage range, providing an ultra-low standby current for energy efficient operation. Additionally, the device provides the necessary circuitry for efficient management of large output capacitors and is capable of handling transient loads and inrush current.

Working Principle

The LTC3878EGN#TRPBF is a current-mode switching controller that operates in two modes: voltage-mode control and current-mode control. In voltage-mode operation, the voltage is regulated to a specific setpoint, typically using an external feedback pin. In current-mode control, the output current is monitored and maintained at a specific level. This mode is most suitable for applications where the load exceeds the available drive voltage.

The part provides an adjustable switching frequency and external compensation capabilities allowing it to be used in applications where fast dynamic response is required. It also features a dynamic slope control feature that reduces the voltage ringback caused by output capacitors before the device enters into a new cycle. Additionally, it takes advantage of an internal foldback current limit to protect the FETs and output inductors from short circuit or overload conditions.

The combination of its adjustable switching frequency, current and voltage mode control, external compensation feature, and fast transient response capability makes the LTC3878EGN#TRPBF an ideal choice for a wide range of applications.