UC28025DWG4

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UC28025DWG4 is a voltage regulator, which belongs to the DCDC switching controller category in the PMIC (Power Management Integrated Circuit) family. The highly integrated switching regulator is a single power supply for multiple DC/DC regulated outputs. It provides good EMI (Electromagnetic Interference) performance over a wide load range and is suitable for both synchronous and quasi-synchronous applications.

The UC28025DWG4 features an innovative architecture that allows precise current sensing and control. It utilizes a novel foldback current protection mechanism and provides accurate current-mode control with low start-up current, extremely low output power dissipation and reduced ringing. The foldback current limitation method enables it to survive short-circuit and overload conditions.

The UC28025DWG4 is specifically designed for modern electronic equipment with its specific application field in telecommunication, networking and data acquisition equipment. Common usage includes PC or notebook power supply, hard disk drive, server power supply and other digital signal processing (DSP) applications. It is well suited for powering microprocessors, memories and field-programmable gate arrays (FPGAs). With its high turn-on speed and excellent response to load transients, this device provides high-efficiency power converters.

The working principle of the UC28025DWG4 is based on its PWM (pulse-width modulation) controller which employs the current-mode control technique. This technology utilizes peak current feedback to regulate the output voltage. The controller operates in a fixed-frequency mode, while maximum frequency is set by the selection of external components. It offers excellent line and load Transient response with its powerful pulse by-pulse current limit.

The UC28025DWG4 integrates an on-chip temperature compensation circuit which allows the device to work in both environments of air-cooled and thermally regulated systems. It has an integrated embedded LDO (Low Dropout linear regulator) for continuous power sequencing. The power up/down and power current sequence parameters can be set through external resistors, and external voltage reference can be adjusted through capacitors.

The UC28025DWG4 provides a robust system protection, including under-voltage lockout (UVLO), over-current protection, over-voltage protection, over-temperature protection and short-circuit protection. In addition, it has an adjustable soft-start function and auto-recovery feature, enabling it to respond to open and short-circuit conditions quickly and safely. Its internal 5A/150/mΩ power N-MOSFET provides an excellent output power margin.

The UC28025DWG4 is one of the most advanced switching regulators available today, providing versatile and efficient power conversion with virtually no loss and with built-in fault protection. Its high switching frequency and low external parts count enable compact, low profile and high performance designs, making it a suitable choice for many applications.

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