S-812C28AUA-C2IT2U Integrated Circuits (ICs)

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The S-812C28AUA-C2IT2U is a step-down switching voltage regulator from the PMIC-Voltage Regulators-Linear category. It is a two-channel, low-quiescent current (1 mA) synchronous-rectifier buck regulator with an adjustable output voltage range of 0.6 V to 3.6 V. It is suitable for applications that require excellent transient capability, high output voltage accuracy and the ability to operate over a wide input voltage range.

In circuit operation, the device draws a supply current of between 0.1 mA and 4 mA depending on load and junction temperature. A thick oxide MOSFET combined with a low quiescent current LDO allows stable operation over a wide input voltage range of 4.5 V to 14 V. The device’s external soft-start feature provides for a gradual output voltage increase to reduce light load rise time, which reduces the possibility of sensing a fault condition when starting up.

The S-812C28AUA-C2IT2Uincludes several built-in protections such as thermal shut-down, over-current protection, under-voltage lockout of the synchronous rectifier, and over-voltage protection. It has a fixed switching frequency of 1.5 MHz and features direct connection to an external ceramic capacitor. The device also features internal or external feedback selection, and a 2-level current limit.

The S-812C28AUA-C2IT2U is optimal for synchronous rectification buck converters because of its superior features. It has an internal soft-start feature and an adjustable output voltage range of 0.6V to 3.6V, making it suitable for a variety of applications. It also features an efficient onboard synchronous rectifier, and a wide operating input voltage range of 4.5V to 14V. Other features that make the device very suitable for synchronous rectification buck converters include a low quiescent current (1 mA), a thick oxide MOSFET, a high efficiency fixed switching frequency of 1.5 MHz, protection against over-current and over-voltage and under-voltage, and direct connection to an external ceramic capacitor.

The working principle of the S-812C28AUA-C2IT2U is similar to that of other synchronous rectification buck converters in the voltage regulators category. It is a two-channel buck converter in which the MOSFETs are individually enabled and disabled in a complementary fashion to achieve voltage conversion. The switching frequency, current limit, and duty cycle are controlled with voltage feedback and error amplifier, while the internal synchronous rectifier allows the device to achieve very high conversion efficiency. The controller and the high-side and low-side switches are connected in series, making it easy to control the output voltage.

The S-812C28AUA-C2IT2U can be used for a wide range of applications, such as for powering RF front-end, core and peripheral integrated circuits, microprocessors, and other computer/memory components, or for any application that requires a stable power supply. This is due to its high output voltage accuracy, excellent transient capability and wide operating input voltage range. Furthermore, due to its efficient and seamless synchronous rectification, it is also able to provide a low noise output.

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