EL7551CUZ

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The EL7551CUZ is a dual configurable synchronous step-down controller, which is able to provide two independent buck supplies with single inductors. It is primarily used in Low-Noise, Low EMI DC-DC voltage regulation applications. This device is ideal for applications such as notebook battery power supplies and telecom power systems.

The EL7551CUZ has various features, such as its overvoltage, short circuit, and over-temperature protections. Additionally, it has a maximum supply input range of 4.5-42V, providing a total output range of 0.8V to 12V, with adjustable switching frequency.

The input voltage is regulated down to a desired output voltage through a process called Pulse Width Modulation (PWM), which is a type of switching regulator. This requires the use of an inductor, and the nature of the switching regulator enables power conversion with low loss and high efficiency.

The EL7551CUZ consists of two phases, which are responsible for controlling the power output. The phases are driven by the 2-Phase Pulse Width Modulation, which regulates the output in a two-step manner. The two-phase modulation design uses two separate inductors, providing a total output current of up to 2A each.

The Pulse-Width Modulation voltage control also allows for precise voltage control and active slope compensation. This results in precise output voltage regulation, as well as improved transient performance, eliminating the need for oversized passives.

The EL7551CUZ has several other features designed to increase efficiency and simplify layout considerations. It uses a high-speed adaptive on-time control scheme, which adjusts the on-time pulses according to the load and input voltage. This not only increases efficiency, but also eliminates the need for a compensation network.

The EL7551CUZ also has a sleep-mode feature to reduce power consumption when the output load is low. This feature enables the device to enter a low-power state, while still providing the necessary regulation.

Overall, the EL7551CUZ is an excellent choice for low-noise, high-efficiency DC-DC voltage regulation applications. Its wide input voltage range and precise voltage control make it ideal for applications such as notebook battery power supplies, in combination with its low external component count and easy layout.

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