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The S-812C37BMC-C4RT2G voltage-mode linear regulator is a three-terminal device with adjustable output voltage. It is an ideal control element for a broad range of applications including but not limited to battery charger, AC/DC adapters, PCs, instrumentation, medical devices, and automotive electronics. This regulator is designed to provide precise regulation of output voltages with high accuracy, low ripple, and fast transient response.

The primary functions of the S-812C37BMC-C4RT2G are to provide precise output voltage and to provide output current limiting. To regulate the output voltage, the control loop consists of a trans-conductance amplifier, an error-amplifier and an output voltage measurement circuit. The output voltage is measured by a voltage divider across the output of the S-812C37BMC-C4RT2G and compared against a stable reference voltage. The error-amplifier compares the output voltage to the reference voltage and adjusts its output until they match. This output is then used to adjust the duty cycle of the trans-conductance amplifier. The trans-conductance amplifier then adjusts the output current of the S-812C37BMC-C4RT2G to maintain the desired output voltage.

To limit the output current, a power-MOSFET switch is connected in series with the output voltage. When the output current exceeds the programmed threshold, the power MOSFET is turned on and the output current is limited. The power MOSFET is turned off when the output current drops below the programmed threshold. The maximum current limit is internally fixed at 2A for safety considerations.

The S-812C37BMC-C4RT2G also has a wide input voltage range of 4V to 12V and an adjustable output voltage range of 0.8V to 8V. The load regulation is accurate within ±1.5%, and the line regulation is accurate within ±0.1%. The S-812C37BMC-C4RT2G is also capable of providing a regulated output with a switch-mode transient response of less than 5µs. The device also includes a power-on reset and is internally compensated for stability.

The S-812C37BMC-C4RT2G is an ideal choice for powering various applications such as laptops, set-top boxes, gaming consoles, smart watches, portable media players, and portable navigation systems. It has excellent output current limiting capability and fast transient response. It also provides a wide input voltage range and can operate in high-temperature environments. The S-812C37BMC-C4RT2G is provided in a small 8-pin TSSOP package, which makes it ideal for space-restricted applications.

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