LTC1261CS8-4.5#PBF

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PMIC or power management integrated circuits are semiconductor devices that combine many different electrical functions in order for to complete the requirements for power management in various communication, consumer, computer and industrial electronics. Voltage regulators are the main components of PMICs. They are the elements responsible for ensuring that the supply voltages to the digital components are within a valid operating range. DC-DC switching regulators are an extended class of voltage-regulating devices and circuits, which is mainly used where high power conversion efficiency, low noise and/or small size are required.

The LTC1261CS8-4.5#PBF is a 3 A step−down DC−DC switching regulator. It is a constant frequency, voltage−mode control with integrated power MOSFET and precise enable circuitry. It features ultra−low quiescent current, high efficiency, precise output voltage, low temperature shutdown and fast response to line and load transients. The operating voltage range is from 4.5 V to 28 V, the output voltage is adjustable from 0.8 V to 15 V and the switching frequency is selectable between 100 kHz, 250 kHz and 500 kHz.

The LTC1261CS8-4.5#PBF is ideal for powering low voltage CPU/DSP core, ASICs and FPGAs. It can also be used in other high current and low voltage applications such as server processors, communications, hand−held devices and industrial systems. It is a very useful and efficient switching regulator in the majority of applications where a step−down converter is necessary.

The working principle of the LTC1261CS8-4.5#PBF dc-dc switching regulator is based on the boost-buck topology. This topology works with an inductor to convert the input voltage to the desired output voltage. The switching waveform consists of a series of short pulses which are interrupted and followed by a longer gap. When the switching pulse is on, a current flows through the inductor resulting in energy storage in the magnetic field. During the off cycles, the stored energy is converted into the output voltage by the action of the inductor. The output voltage is regulated by controlling the on-time interval of the switching waveform.

In summary, the LTC1261CS8-4.5#PBF is a DC-DC buck converter that provides a low cost, efficient and reliable solution for a wide range of applications, especially those which require a step down converter. With its ultra-low quiescent current, high efficiency, precise output voltage and fast response to line and load transients, it is a very useful device for many power management applications. Its working principle is based on the boost-buck topology, with a series of switching pulses and a longer gap, to allow for energy storage in the magnetic field and output voltage regulation by controlling the on-time interval of the switching waveform.

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