SG2845DM

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The SG2845 is a current-mode, step-up/step-down DC/DC switcher controller. It uses advanced circuit design, such as synchronous rectification, to achieve high efficiency operation, low EMI signature, and high-precision current limiting, even at light load. SG2845 not only simplifies the design process, but also reduces the number of external components, making it suitable for applications that require low cost and small form factors.

Application Field

The SG2845 is primarily used in electronic devices such as notebook computers, set-top boxes, tablets, Smartphones, and other portable consumer electronics. It can be used for both step-up and step-down applications and is capable of driving a wide range of loads, from LEDs to high power CPUs. It also features high efficiency and low EMI, making it a great choice for applications that require small form factors, low cost, and high performance.

The SG2845 is also a great choice for industrial, medical, and industrial control applications, where small size and robust design are required. The small form factor and low cost make it an ideal choice for battery powered devices such as hand-held devices and medical instruments, such as hearing aids. Its robust design and flexible control options, such as frequency and duty ratio, make it a great choice for challenging industrial control applications, such as motor control.

Working Principle

The SG2845 is a current mode switching controller. It works by monitoring the load current of the load it is connected to and then adjusts its internal clock frequency to keep the load current constant. This allows the SG2845 to provide a constant output voltage, even at light loads. The SG2845 is also able to regulate the output current precisely using its internal current sensing / current limiter circuit.

The SG2845 features a high efficiency synchronous rectification that can reduce the output ripple and noise. When used in a step-down application, this rectification can boost the efficiency of the system, allowing it to deliver the same output voltage with less power than a standard step-down controller. To further improve efficiency in a step-down application, the SG2845 can utilize its integrated two-stage power conversion topology, allowing it to deliver a high output power with a low power loss.

The SG2845 can also be used in step-up applications, where it can deliver a high output voltage with low power loss. To further improve efficiency, the SG2845 can also utilize its discrete buck-boost controller, allowing it to increase the output voltage while keeping the power loss low.

The SG2845 has a wide input voltage range, from 1.5 V to 5.5 V. It is capable of driving a wide range of loads, from LEDs to high power CPUs. It also features internal protection features, such as over-temperature protection and short-circuit protection, ensuring reliable operation. The SG2845 also features an adjustable soft-start to reduce inrush current.

The SG2845 is a versatile and reliable controller that can be used in a variety of applications. Its high efficiency, low EMI, and small form factor make it a great choice for many applications, from battery powered hand-held devices to industrial control systems.

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