S8112B9

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S8112B9 is a chip with integrated four N-channel power MOSFETs. It is designed for use in low voltage, high-efficiency, synchronous DC-DC buck converter applications. The S8112B9 synchronizes an N-channel MOSFET in the high-side (H) path and a P-channel MOSFET in the low-side (L) path with the internal oscillator. This ensures that both MOSFETs switch at the same frequency. The S8112B9 is housed in a 2.45mm × 3.7mm SOT23-6 package, making it an ideal choice for small footprint designs. It operates from an input voltage range of 4.5V to 25V and supports up to 3A output current.

The S8112B9 is commonly used in applications with high efficiency demands, such as power adapters, battery chargers, LED drivers, and other DC-DC converters. Its advanced protection features include over-current protection (OCP) as well as thermal shutdown (TSD). This makes it an ideal choice for use in applications that require robust protection against over-current faults and excessive temperatures.

The core of the S8112B9 is an oscillator source that is used to switch the MOSFETs. The oscillator source can be externally adjusted to change the switching frequency. The switching frequency is adjusted to meet the requirements of the output voltage. The S8112B9 also has two digitally adjustable modes, pre-bias and direct modulation. In pre-bias mode, the switching frequency is adjusted to a multiple of the pre-bias voltage, which keeps the output voltage stable even when the input voltage fluctuates. In direct modulation mode, the switching frequency is controlled directly by an external current sense signal.

The S8112B9 also has a dead-time control circuitry, which allows the user to control the switching of the MOSFETs. This helps to minimize the power losses and ensure high efficiency operation. Additionally, the S8112B9 has an internal voltage reference, which ensures that the output voltage is maintained even when the input voltage changes.

In summary, the S8112B9 is a low-voltage, high-efficiency, synchronous DC-DC buck converter that is commonly used in applications with high efficiency demands. It offers several features, such as over-current protection, thermal shutdown, pre-bias and direct modulation, and dead-time control, which help to ensure reliable operation. The S8112B9 is housed in a small form factor and supports up to 3A output current, making it an ideal choice for use in small footprint designs.

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