LTC3814IFE-5#TRPBF

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The LTC3814IFE-5#TRPBF is a DC-DC switching controller based on PMIC voltage regulators. This device combines a high accuracy on-time generator and two current-mode pulse-width-modulated (PWM) controllers with 0.5mA minimum on-time, making it ideal for narrow duty cycle applications such as automotive, communications, and industrial applications. As a switching controller, the LTC3814IFE-5#TRPBF regulates the input and output voltages in the DC-to-DC conversion process to produce a desired output voltage. Furthermore, it maintains a galvanically isolated voltage regulation loop needed for safe operation.

The main application fields for the LTC3814IFE-5#TRPBF include power over Ethernet (PoE), automotive engine control, battery charging and voltage regulation, industrial programmable logic controllers (PLCs), communications equipment, LEDs, and many more. It is specifically suited for low power, high efficiency Point of Load (PoL) in applications where space for thermal management is constrained, as it requires a minimal 4mm x 4mm package size for SOIC and QFN packages.

The working principle of the LTC3814IFE-5#TRPBF is based, at its core, on error correction. This is accomplished through current-mode pulse-width-modulated (PWM) control, a form of Pulse Width Modulation (PWM) that is used to accurately regulate output voltage in response to an input signal. The device uses an integrated 0.5mA minimum on-time generator to generate a current ramp waveform proportional to a signal signal applied to the on-time control pin. It also uses an on-time signal error correction technique, which compares the on-time to a fractional reference from the on-time control pin and adjusts the on-time accordingly. It is this error correction technique that makes the LTC3814IFE-5#TRPBF particularly suited for applications requiring high efficiency and very transient response.

The device is comprised of two main components: a regulator and a controller. The regulator is responsible for sensing and regulating the input voltage, while the controller adjusts the output voltage on the fly, by varying the pulse-width of the output. The device is self-contained and requires minimal external components, such as a resistor and capacitor. Furthermore, it features an adjustable voltage tracker, which senses the output voltage and adjusts the step-up or step-down switching ratio to maintain a consistent output voltage.

In summary, the LTC3814IFE-5#TRPBF is a versatile switching controller based on PMIC voltage regulators. It is designed for low power, high efficiency applications in telecom, automotive, industrial, battery charging and PoE, among many others. The device features an adjustable voltage tracker, extremely low minimum on-time, and signal error correction, making it ideal for highly accurate and low noise applications.

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