UC3914DWTRG4

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Power Management Integrated Circuit (PMIC) - Hot Swap Controllers are devices that gradually power up, control and protect digital components from inrush current. The UC3914DWTRG4 is a monolithic integrated circuit (IC) device designed to control hot swap circuitry where board inrush current is sensed and limited. The UC3914DWTRG4 also provides voltage and current waveform shaping.

Besides controlling inrush current, the UC3914DWTRG4 is also designed to provide efficient power distribution, eliminate power shortages and transfer power between various sources. This allows for efficient powering of high power electronics such as those found in telecom, military and industrial applications. As with all power management ICs, the UC3914DWTRG4 supports a wide range of input and output voltages, current levels, and other parameters.

The UC3914DWTRG4 is a low cost, four-phase, low frequency step-down switching regulator that delivers high efficiency. It is designed for applications where cost and size are a restricted and it is suitable for a wide range of battery-powered applications. The UC3914DWTRG4 offers an adjustable output voltage from 3.3V to 32V, a maximum output current of 300mA and an adjustable output frequency from 20kHz to 3MHz.

When the device is in Normal mode, the output voltage is regulated. In UVLO (Under Voltage Lock Out) state, the output voltage is maintained above a predetermined threshold by stopping switching action. The device will remain in standby mode until the output voltage is above the UVLO threshold. The device supports a low quiecent current and burst-mode operation to improve efficiency. The working principle of the UC3914DWTRG4 is centered around Pulse Width Modulation. The current sense and logic circuitry operate in conjunction with the internal feedback loop to accurately adjust the PWM duty cycle and regulate the output voltage. The current limit circuitry detect the input current threshold and will limit the current output to maintain the power system stability. By reducing the peak currents, ripple and losses are minimized.

The UC3914DWTRG4 is ideal for applications where there are high hot swap currents and space is a limitation. Its low cost, high efficiency and small size bring a unique value proposition to the power management market, making it a suitable choice for many applications.

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