LM25005MH

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LM25005MH application field and working principle

LM25005MH is a family of monolithic integrated circuits that are widely used in DC-DC switching regulators. It is suitable for a wide range of input and output voltages, and is capable of up to 90% efficiency at full load.

Application field:

LM25005MH is a DC-DC switching regulator designed to provide a reliable, efficient, cost-effective and compact solution for many power supply applications. It can be used in many applications, including power supplies for consumer electronics, mobile systems, wearable electronics, computer peripherals, automotive electronics, computers, telecommunication systems, medical equipment and wireless systems.

The applications area primarily includes:

• Battery charging for laptops, tablets, and cell phones
• DC-DC conversion for distributed power systems
• Power supply for non-isolated digital signal processors, microcontrollers, and ASICs
• Power supply for digital TVs, TVs and LCDs
• Power supply for micro HDMI and USB connectors
• Power supply for embedded boards and gaming graphics cards
• Smart/intelligent power supplies for digital voice and audio systems
• High-efficiency Voltage Regulation Modules

Working Principle:

The LM25005MH is a high-efficiency, low-dropout voltage regulator (LDO) with an internal synchronous buck converter that allows it to achieve high conversion efficiency over wide input and output voltage ranges. It achieves this efficiency by relying on a ripple-based control technique that modulates the main power switch to limit input current ripple and maintain output voltage accuracy when the environment changes. The output voltage is held constant while the input voltage and/or load current fluctuate.

The LM25005MH operates in what is known as a fixed-frequency discontinuous mode. This mode of operation consists of three phases: voltage ramp, current limit, and constant frequency. When the ramp phase is enabled, the output voltage rises and the current falls until the current limit cycle begins. During the current limit phase, the input current is controlled to a set limit, and during the constant frequency phase the output voltage is regulated to the programmed value.

Once the LM25005MH has reached its preset output voltage, it enters a low power standby mode to conserve energy. The body diode of the integrated power switch is forward-biased while in standby mode, so that the output voltage is held at its steady state. The device features a protection circuit to prevent short circuits and under-voltage lockout. This protection circuit can also be used to limit input current in high output current applications.

In summary, the LM25005MH is an integrated DC-DC switching regulator that provides a reliable, efficient, cost-effective and compact solution for many power supply applications. It is capable of up to 90% efficiency at full load, and can be used in a wide range of input and output voltage ranges. It utilizes a ripple-based control technique and operates in a fixed-frequency discontinuous mode to ensure high efficiency and stable operation across different environments.

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