LM2651MTCX-1.8/NOPB

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The LM2651MTCX-1.8/NOPB is an efficient and adjustable monolithic step-down DC-DC regulator module with a high frequency quasi-resonant topology from Texas instruments. The regulator is designed to provide accurate output voltage regulation while using a minimal number of components, reducing the total cost and improving reliability. It features an adjustable output voltage and delivers up to 1.8A continuous output current. It is well suited for switching power supplies applications such as Automotive, computer Processors, FPGAs and Home Appliances.

The LM2651MTCX-1.8/NOPB is an efficient buck switching regulator, which can offer a wide range of input/output combinations. It offers a built-in, high-efficiency, synchronous-rectified buck converter, enabling output voltage to be adjustable within a 1.2V to 20V output range. It also integrates an on-board 1.4V reference voltage for current limit accuracy. The input voltage range is from 2.3V to 40V.

The LM2651MTCX-1.8/NOPB is specifically designed for low quiescent current and low noise operation, providing high-efficiency operation from 1.2V to 20V output. The device is designed to switch at very low frequencies (normally in the range of 400KHz - 1.4MHz). The typical efficiency for the LM2651MTCX-1.8/NOPB is 93%.

The LM2651MTCX-1.8/NOPB comes with an integrated MOSFET rated at 60V, providing a good compromise between efficiency, cost and power dissipation. Other features of the device include an adjustable switching frequency up to 1.4MHz, integrated soft-start and current limit protection, over temperature protection, and a high-impedance input stage allowing the device operate with a wide range of external components.

The typical application for the LM2651MTCX-1.8/NOPB includes digital cameras, gaming and entertainment consoles, smart phones, tablets, notebooks, server, digital televisions, LCD and LED televisions, automotive ECU and home appliances. Overall, the LM2651MTCX-1.8/NOPB is a low-cost and highly efficient buck regulator suitable to power a variety of applications.

The working principle of the LM2651MTCX-1.8/NOPB is based on a high frequency, quasi-resonant switch-mode topology. The circuit design is optimized for minimum size and minimal component count. When the device is energized, the integrated MOSFET is initially closed to provide a closed circuit to discharge the output capacitors and prevent any overvoltage on the output. As the output voltage rises, the internal current signal starts to follow the output voltage, in a "closed loop" control method. At the same time, the LM2651MTCX-1.8/NOPB\'S pulse width modulates the output voltage in proportion to the amount of current cycled through the main switch.

This pulse-width modulation is called "quasi-resonant" because the total switching frequency changes as the current and voltage loop gets further out of phase. The advantage of this design is that only a minimum of external components are needed. Once the loop has been stabilized, the total switching frequency is typically 400KHz - 1.4MHz.

The LM2651MTCX-1.8/NOPB also includes several protection features like over temperature and overcurrent protection, integrated current limit and soft start circuit. The device also features an open loop dynamic voltage positioning (DVP) which compensates for the output capacitance and allows the device to maintain a steady output voltage even during light or no load conditions.

In summary, the LM2651MTCX-1.8/NOPB is a compact, efficient and adjustable monolithic step-down DC-DC regulator module suitable for a range of applications. Its excellent performance and adjustable output voltage makes it an ideal choice for a range of applications including automotive, computer processors, FPGAs and home appliances.

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