S-85S1PC21-I8T1U

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The S-85S1PC21-I8T1U is a highly integrated DC-DC switching regulator that can be employed in a variety of microprocessor-based systems. Its main applications are for the purpose of providing reliable, low-noise power to high performance ASICs, FPGAs and microprocessors. This switching regulator is available in the industry standard PowerQFN package and offers high switching performance, efficiency and ripple noise. Its internal voltage regulation also ensures that a stable output is maintained under a wide range of input voltage conditions and load currents.

The S-85S1PC21-I8T1U has many features that make it ideally suited for use in applications where a sustained, reliable power source is required. These features include an internal loop compensation, a fast transient response, an adjustable switching frequency, an adjustable output voltage and fast start-up time. The integrated voltage regulator is designed to ensure that the output voltage remains within 0.5% accuracy over an output load range of up to 0.9A and an input voltage range of up to 1.8V. Additionally, the internal loop compensation minimizes EMI and improves system stability. Furthermore, an integrated enable control logic allows the device to be disabled, while preventing current flow in the power ground path when the controller is disabled. This feature is especially useful when the system is placed in a low power state.

The S-85S1PC21-I8T1U utilizes a synchronous PWM rectifier architecture that produces a regulated direct current output with low harmonic distortion. This switching regulator is ideal for use in a wide range of applications such as computing, industrial, communications and medical equipment. Additionally, it is suitable for use in automotive, military and aerospace environments. It is rated for operation over an extended temperature range of -40°C to +105°C. Other features include a short-circuit protection circuit, over temperature protection and low power shut-down operation.

The S-85S1PC21-I8T1U has the ability to operate with either a step-up or step-down converter topology, with the added advantage of providing accurate DC voltage regulation over a wide input voltage range. The positive voltage regulation loop employs an error amplifier, a logic controlled high side mosfet switch and a low side current sense resistor to sense output current ripple. The output voltage is regulated by the error amplifier which compares the output voltage with a reference voltage, and adjusts the duty cycle of the high side transistor switch in order to regulate the output voltage. The output voltage level can be adjusted via an external voltage divider for fine tuning. The maximum output voltage of the device can be increased to up to 5V by using an external driver.

The S-85S1PC21-I8T1U switching regulator is an ideal choice for lower power systems that require enhanced noise immunity, particularly for high performance ASICs and FPGAs. Its features, such as fast transient response, low output ripple, high efficiency and low quiescent current, provide a suitable solution for high frequency, high current applications. Furthermore, the built-in enable control logic and adjustable switching frequency allow the user to fine tune the performance of the device to suit their requirements.

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