LTC3864MPMSE#TRPBF

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LTC3864MPMSE#TRPBF Application Field and Working Principle

LTC3864MPMSE#TRPBF is a dual-output synchronous step-down DC/DC converter controller with integrated high-side and synchronous FET drivers that combines high efficiency and dynamic performance with a minimum of parts. By using external MOSFETS, it can operate from input supply voltages up to 60V. Advanced features such as off-time control, Burst Mode operation, hiccup-mode overload protection, and thermal shutdown provide robust operation and easy implementation of intermediate bus supplies between the main input and multiple outputs with excellent dynamic response.

The purpose of the LTC3864MPMSE#TRPBF device is to control the step-down conversion of a voltage from an input power source to a regulated output. It operates in a synchronous model and uses two external N-channel MOSFETs to achieve good efficiency. This device is a compact, dual-output synchronous step-down power supply controller solution, suitable for wide input voltage range applications in buses, datacom, imaging, peripherals, and general embedded systems.

The LTC3864MPMSE#TRPBF DC-DC controller is designed to deliver high power and high efficiency with simple design. It utilizes current-mode PWM control with synchronous rectification to minimize internal losses, minimize temperature rise, and lower output voltage ripple. Its main features include a wide 4.5V to 60V input voltage range, current-mode PWM control with direct inductor current sensing, a 600kHz switching frequency, an adjustable output voltage and over-voltage protection, and low shutdown current.

The LTC3864MPMSE#TRPBF device is based on a synchronous current-mode PWM control architecture. When the chip is first powered up, the PWM control loop takes over and adjusts the delay angle of the synchronous MOSFET switches to maintain a constant output voltage. This control loop also responds to changes in the output load. When the load decreases, the synchronous MOSFETs reduce their duty cycle which reduces the output voltage, allowing the device to maintain tight regulation.

The LTC3864MPMSE#TRPBF is designed with user-programmable features to optimize efficiency and performance, including over-voltage protection and external frequency synchronization. It has a built-in pulse-skipping mode for no-load and light-load operation, reducing current consumption to as low as 25%. The device also includes a hiccup-mode overload protection that triggers a restart when the current exceeds a user-defined threshold.

In addition to its high performance features, the LTC3864MPMSE#TRPBF is highly integrated and requires very few external components. This helps to simplify board layout as well as reduce cost and design time. The device is designed to meet the needs of a wide range of industrial, communications, computer and consumer applications.

The LTC3864MPMSE#TRPBF is an ideal solution for entry-level, intermediate bus applications. Its wide input voltage range, excellent efficiency, and low standby current make it an excellent choice for powering devices that require a wide range of input voltages. The integrated features make it an easy-to-implement solution that helps to reduce board footprint while maintaining high efficiency and low output voltage ripple.

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