LTC3868IUFD-1#TRPBF

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LTC3868IUFD-1#TRPBF is a high performance synchronous step-down DC/DC buck switching controller from Linear Technology Corporation and is marketed under the UltraFET brand. This controller is designed for the purpose of implementing power supplies for desktop, laptop, server and telecom applications which are highly efficient and need very low output ripples and high noise immunity. The UltraFET power supply design family offers a wide variety of features such as an advanced, broadband, high-frequency modulation scheme. The LTC3868IUFD-1#TRPBF is a single-channel buck regulator with an internal oscillator and configurable frequency. By varying the oscillator frequency, the circuit can be efficiently optimized to use the optimum output inductance, capacitance and duty cycle value. This allows a low cost, high performance alternative to traditional switching regulators which require external components in order to adjust the above parameters. Other features of the LTC3868IUFD-1#TRPBF include programmable output voltage, programmable soft-start/stop, low parts count, current foldback during over-current shutdown, forced fixed frequency option, differential amplifier for remote sensing, over-voltage protection and trimable UVLO.

Application Field

The LTC3868IUFD-1#TRPBF is an ideal choice for powering applications such as Point-of-Load (POL) power supplies, high efficiency DC/DC applications, and telecom power supplies that require a precise output voltage with low noise and ripple. It is also suitable for audio and video system power supplies where precise output voltage is necessary. The controller can also be used to provide intermediate voltage in voltage step-down and step-up applications. The wide range of features it offers make it suitable for use in a wide variety of applications.

Working Principle

The LTC3868IUFD-1#TRPBF uses a synchronous step-down DC/DC buck switching controller architecture. The controller is designed to handle a wide input-voltage range of 2.95V to 72V and provides a maximum output current of 7A. It is a boost/buck switching controller consisting of an oscillator, a voltage reference, an error amplifier, logic and high to low side gate drivers along with a current sense resistor. The built in oscillator is adjustable and allows the frequency to be varied between 400kHz to 2.5MHz.

The duty cycle can be adjusted by the feedback signal which uses a differential amplifier and differential R/C filters to provide a low impedance signal to the controller. The input voltage is compared to the reference voltage by the error amplifier. This signal is then fed to the logic circuitry which turns on and off the high and low side MOSFETs. The current sensing resistor is used to provide an accurate output voltage regulation. In addition, the controller also provides protection against over-voltage, under-voltage, over-temperature and reverse current.

The LTC3868IUFD-1#TRPBF also provides a programmable soft-start/stop feature which regulates the output voltage during ramp-up or ramp-down. This feature is useful for saving power during start-up or shut-down of the system. Moreover, the current foldback mode helps to protect the system against overload. It reduces the output current when an overload is detected. The forced fixed frequency mode allows the controller to operate at a fixed frequency even if the feedback signal is not present.

The features of the LTC3868IUFD-1#TRPBF make it ideal for high efficiency, low noise, and high power output voltage applications. Its features make it an ideal choice for various desktop, laptop, server and telecom applications requiring high performance, yet efficient power supply solutions.

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