S-8355Q28MC-OWNT2U

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S-8355Q28MC-OWNT2U is a DC DC switching controller for power management integrated circuits (PMIC). It is designed to provide an efficient and cost-effective solution for DC/DC conversion applications. It is suitable for applications requiring wide input voltage range, low output voltage ripple, a wide frequency range and low quiescent current.

Application Field

The S-8355Q28MC-OWNT2U is used in various applications including automotive, consumer, computer, telecom, industrial, and communication applications that require high efficiency, wide temperature range, wide input voltage range and output control accuracy.

The S-8355Q28MC-OWNT2U is a wide Vin-rating DC-DC converter with a voltage-fed design suitable for applications requiring load step regulation (step-down/step-up) and maximum power management efficiency. It provides excellent transient response, low output voltage ripple, fast start-up capability, and a wide frequency range (200 kHz – 1.0 MHz).

The S-8355Q28MC-OWNT2U is capable of operating at low duty cycle and is suitable for applications requiring a limited power dissipation but a wide operating temperature range. Its high peak current capability and ultra low (100 µA) quiescent current helps reduce the solution cost, size and power dissipation.

Working Principle

The S-8355Q28MC-OWNT2U is an adjustable low noise current mode control step-down converter. Its unique operating principle combines the benefits of current mode control with an adjustable power stage design.

It operates in switching transition period with the precision cycle-by-cycle peak current limit (IPCM), and the average current flow through the main switch is regulated by the LOOPIN voltage. When the ON-time goes too long with decreasing input supply, the current mode control circuit will start to regulate the pulse width by reducing the slope of the current ramp signal, resulting in a drop of output voltage.

The S-8355Q28MC-OWNT2U employs a two-loop architecture which consists of a primary loop for voltage regulation and a secondary loop for loop compensation. The primary loop regulates the output voltage, while the secondary loop maximizes the dynamic performance by compensating the changes in the transfer function of the control to output path.

The S-8355Q28MC-OWNT2U is able to maintain stable voltage across output capacitors, reducing the need for large output capacitance and ensuring fast transient response. It also features a low operating frequency (200kHz to 1.0MHz) and wide temperature range (from -40°C to +105°C) for applications with extreme environmental conditions.

The S-8355Q28MC-OWNT2U also provides a slew rate control pin which can detect the output voltage ripple, and adjust the output voltage automatically and efficiently. This can help to provide a smooth output voltage and reduce the output noise.

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