LM25575MH

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LM25575MH Application Field and Working Principle

The LM25575MH is a high efficiency, voltage-mode synchronous buck-boost DC/DC converter with an integrated high-side and low-side power MOSFET. It operates from a wide range input voltage range that is adjustable from 5V to 48V, and provides an adjustable output voltage that can go up to 45V. It combines a 2.1A tRDSon output switch, programmable current limit and integrated output disconnect switch to meet the performance requirements of critical applications. The LM25575MH is ideal for buck-boost applications because it provides higher efficiency than a typical buck regulator, while allowing the user to lower their external component counts.

Features

• Wide 4.5V to 48V input voltage range
• High efficiency, low profile design
• Integrated high-side and low-side power MOSFETs
• Adjustable output voltage up to 45V
• Overcurrent protection with adjustable current limit
• Integrated output disconnect switch
• Integrated thermal shutdown
• Integrated soft start

Applications

• Wireless infrastructure
• Point-of-Load (PoL) regulation
• Medical applications
• Industrial and automotive power supplies
• Distributed power systems
• Embedded systems

Working Principle of the LM25575MH

The LM25575MH is a voltage mode synchronous buck-boost regulator, which is designed to convert a battery voltage, or other DC voltage on the input, into a regulated DC voltage on the regulated output. It works by continuously monitoring the adjustable output voltage, and switches between a buck and boost configuration, depending on the input voltage. The LM25575MH employs a pulse-width modulation (PWM) control loop to regulate the output voltage. The two integrated power MOSFETs, with their low on-resistance and drive capability, are used to switch between buck and boost. The LM25575MH also features integrated current limit and thermal shutdown and an integrated output disconnect switch.

Conclusion

The LM25575MH is a highly efficient, voltage-mode synchronous buck-boost DC/DC converter with an integrated high-side and low-side power MOSFET. It operates from a wide range input voltage range that is adjustable from 5V to 48V, and provides an adjustable output voltage that can go up to 45V. The LM25575MH is ideal for buck-boost applications because it provides higher efficiency than a typical buck regulator, while allowing the user to lower their external component counts. Furthermore, due to its integrated current limit, thermal shutdown, and an integrated output disconnect switch, the LM25575MH is well-suited for a wide range of demanding applications.

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