ST1S12GR Integrated Circuits (ICs)

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The ST1S12GR, by STMicroelectronics, is a type of DC‐DC switching regulator. It is ideal for applications that require low power with high efficiency. This device provides the features necessary for efficient power conversion with integrated adaptive on‐time and dynamic current limiting. It is encased in a leadframe measuring 6mm by 6mm and manufactured using the latest advanced gallium nitride (GaN) technology.

The ST1S12GR can be configured as a step down regulator to provide a consistent output voltage regardless of input voltage. Using an input range of 3.3V to 45V, the ST1S12GR yields a stable output voltage of 1.8V to 28V, up to a maximum output current of 12A. In addition to efficient operation, the ST1S12GR has built in protections against thermal shutdown and over voltage and is capable of operating efficiently up to 96% under light load conditions.

The ST1S12GR has an adjustable switching frequency that can be tuned to optimize load response and efficiency for the application requirements. Additionally, the cutoff current for the current mode control (CMC) can be progressively reduced to maximise efficiency in light load conditions. The device also features an onboard voltage and thermal monitor to provide system protection against unexpected conditions.

The ST1S12GR can be used in a variety of different application fields such as consumer electronics, cellular phones, and portable computing devices. It is suitable for use in high‐performance, space‐constrained applications that require a robust, efficient power solution. Furthermore, the ST1S12GR can be used to convert input voltages from different sources, making it surprisingly versatile.

The ST1S12GR DC‐DC switching regulator is based on the principle of voltage buck‐boost regulation. This provides precise regulation of the output voltage through a feedback loop. The inputs must be higher than the minimum voltage for regulation, with the output voltage generated using an integrated power stage. The power stage consists of a MOSFET switch and a diode to determine the buck‐boost states to create an output voltage with no external components.

Adjusting the output voltage is done through a voltage control loop, which adjusts an internal reference voltage to the desired output value. The loop uses a differential amplifier to compare the output voltage to the reference voltage and adjusts the integrated power stage to keep the output within regulation. The internal circuit is then enclosed in feedback to create a voltage regulation output.

In conclusion, the ST1S12GR DC‐DC switcher offers high efficiency, adjustable switching frequency, and excellent protection against unexpected events. It also has a fully integrated power stage, eliminating the need for any external components. It is capable of providing stable output voltages up to 28V, with a maximum output current of 12A and integrated over‐voltage and thermal shutdown protections. The ST1S12GR makes an ideal choice for a wide range of applications, from consumer electronics to high‐performance portable computing devices.

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