LTC7801EUFD#PBF

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The LTC7801EUFD#PBF is a high-performance, simple to use synchronous step-down DC-DC switching controller for multiple output supply designs. It is part of the family of Linear Technology’s power management integrated circuits (PMICs) designed to deliver a regulated output voltage with fast transient response and high efficiency in a minimum of components. With a single inductor capable of driving up to four independent regulated outputs, the LTC7801EUFD#PBF is ideal for the power supply design of low-cost, high-order multiple output applications. This article will discuss the application field and working principle of LTC7801EUFD#PBF.

Application Field

The LTC7801EUFD#PBF is designed to simplify the power supply design of multiple output applications such as notebook computers, servers, handheld devices, peripheral cards and industrial equipment. By integrating a regulated output voltage with fast transient response and high efficiency in a minimum of components, the LTC7801EUFD#PBF provides a cost-effective solution for multiple output supply designs.

The LTC7801EUFD#PBF also offers a wide working range of 2.7V to 25V, making it ideal for powering various complex system designs from a single source. In addition, it includes protection features such as input under-voltage lockout, over-voltage protection, output under-voltage protection, and an adjustable current-limit protection that helps protect the system from damage caused by power surges. With its low quiescent current, the LTC7801EUFD#PBF is an ideal choice for low power system designs.

Working Principle

The LTC7801EUFD#PBF works by regulating an output voltage by lowering the voltage from the input voltage using a step-down switching controller. This is done by using an external inductor and switching FET to convert the higher input voltage to a lower output voltage. The LTC7801EUFD#PBF regulates the switching frequency of the FETs and also sets the current limit of the device. This helps to protect the system from damage due to power surges.

The LTC7801EUFD#PBF features an adjustable switching frequency and can switch between 1kHz and 2.2MHz, allowing designers to optimize the component size and efficiency of the power supply. The adjustable switching frequency is also combined with an onboard oscillator which helps stabilize the output voltage over a wide temperature range. The LTC7801EUFD#PBF also includes an enable pin which allows the current limit to be adjusted for optimal efficiency, and also for power saving when in use.

The LTC7801EUFD#PBF includes a synchronous rectification feature which reduces power dissipation and improves power efficiency. It also includes a feedback voltage compensation loop which helps to ensure stable operation and fast transient response. The LTC7801EUFD#PBF has built in loop compensation and output correction circuits which help to minimize output voltage ripple. It includes an integrated thermal shutdown feature which helps protect the device from overheating.

The LTC7801EUFD#PBF also features an integrated dual PWM output stage that helps reduce the power dissipation in order to improve efficiency and provide a cost-effective solution for multiple output supply designs. This simplifies the power supply design as the PWM output stages can be designed as a single unit.

In summary, the LTC7801EUFD#PBF is an excellent choice for multiple output supply designs due to its high performance, simple to use synchronous step-down DC-DC switching controller. It features an adjustable switching frequency, low power dissipation, integrated protection features, and adjustable current limit protection. Its integrated dual PWM output stage helps reduce the power dissipation and costs of multiple output supply designs. The LTC7801EUFD#PBF is a cost-effective solution for multiple output supply designs.

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