LM25005MHX/NOPB

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The LM25005MHX/NOPB is a monolithic synchronous buck regulator of DC-DC switching family designed to provide a simple and efficient solution for converting a regulated 5V supply and a variable output voltage rail over a range of 0.6 to 5.5V. It has integrated power MOSFETs and an advanced adaptive on-time control architecture, enabling it to create an extremely reliable, low-noise and high-efficiency power conversion. This device is ideal for applications such as ATMs, Point of Sales (POS) terminals, industrial control systems and Micro Controller (MCU).

The features of the LM25005MHX/NOPB include a wide range of input voltage from 4.5 to 24V with a stable 5 V output, a low-noise operation, a high switching frequency of 2.2Mhz, and an integrated switch current sense. The operating input voltage range of 4.5V to 24V allows the regulator to be used with an input power supply of up to 1A. It also has an adjustable switching frequency of 2.2Mhz to 6Mhz, allowing the use of smaller external components. The device has a robust thermal performance and requires very small amount of external component. The output voltage can be set with a single external resistor and the soft-start and loop compensation are realized with minimal external components.

The LM25005MHX/NOPB supports a variety of applications such as battery-powered systems and off-line adapter, as well as automotive, and industrial applications. In addition, it supports a variety of system requirements such as low noise, cost optimization, and energy saving. Furthermore, the device can operate reliably in hot and cold conditions and with high humidity levels. The thermal performance of the regulator is guaranteed by the integrated copper heat spreaders on the top and bottom of the chip, as well as the use of an exposed metal pad on the die for better thermal management.

The working principle of LM25005MHX/NOPB is based on a buck topology circuit that consists of two transistors, one inductor, two capacitors and two resistors. The input power enters the circuit through the input pin, the voltage is then stepped down by the two transistors. The first transistor is configured as a PMOS and acts as a switch, while the second transistor is configured as an NMOS and acts as a synchronous rectifier. The inductor is used to store energy and the two capacitors act as a filter, smoothing the output voltage. The two resistors are used to set the soft-start and loop compensation values. The output voltage is regulated by the adaptive on-time control architecture, which adjusts the duty cycle on the switch depending on the voltage feedback from the output.

In conclusion, the LM25005MHX/NOPB is a monolithic synchronous buck regulator designed to provide an efficient and reliable solution for converting a regulated 5V supply and a variable output voltage rail over a range of 0.6 to 5.5V. It features an adjustable operating frequency of 2.2Mhz to 6Mhz and requires minimal external components. The integrated switch current sense, thermal protection and low-noise operation make it an ideal solution for a wide range of applications, including battery-powered systems, off-line adapter, automotive, and industrial applications.

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