L5972D

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The L5972D is a monolithic step-down switching regulator from STMicroelectronics. It is an advanced device specifically designed for applications requiring high current and very high efficiency, such as DSPs, FPGAs, digital video, USB and network controllers, as well as battery powered systems. The device incorporates low voltage regulator and LDO functions. It features a low quiescent current of only 3 mA in active mode and a very low dropout voltage at full load for improved efficiency.

The L5972D is a PMIC (power management IC) which offers on-board power sequencing, output voltage sequencing, and overcurrent protection. It offers an adjustable output voltage of between 0.8V and 3.3V and is capable of providing a current of up to 3 A. The device includes several features to help protect against power supply faults, such as over-voltage, over-current, and thermal shutdown. It also includes an integrated phase-locked loop (PLL) to support low power, low noise operation.

The L5972D is used as a DC-DC switching regulator and its main purpose is to step down the input voltage to a lower level for use in systems that require a lower voltage than the main supply. It does this by switching between a high and a low output. The high portion of the cycle is when current is passed through a MOSFET, creating a voltage drop, and the low portion is when the current is shut off and the MOSFET is no longer drawing current. The output voltage is then proportional to the input voltage divided by this on/off ratio.

The L5972D features a current mode control scheme. This means that the output voltage is regulated by sensing the current in the MOSFET switch and adjusting the pulse width of the switching signal accordingly. The pulse width modulation adjusts the width of the high and low output, thus controlling the output voltage. An optional soft start feature minimizes inrush current when the regulator is first powered up.

The L5972D offers a range of protection features to guard against overcurrent, overvoltage and overtemperature conditions. Its integrated under-voltage lockout prevents operation when the input voltage falls below a certain level. Additionally, the device includes an enable pin and a synchronous operation mode to enable high efficiency at light loads.

In summary, the L5972D is an ideal choice for applications that require extremely high current, high efficiency and very low output voltage. Its range of protection features, adjustable output voltage and current sense control make it an excellent choice for many power supply design applications.

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