LM25115SDX

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Power Management IC (PMIC) is a specialized integrated circuit designed to manage power supply of a variety of electronic systems efficiently. Power Supply Controllers, Monitors, and Regulators such as the LM25115SDX are used in electronics industry for various application areas. The LM25115SDX is a monolithic synchronous buck regulator intended for use in applications with limited space requirements.

The LM25115SDX operates from an input voltage range of 4 V to 36 V and provides an output voltage from 0.8 V to 30 V. It is suitable for both single- and multi-phase applications supporting up to 12 A of maximum output current. To ensure maximum efficiency, the unit integrates a high-side MOSFET and internal loop compensation.

The LM25115SDX application field and working principle can be summarized as follows:

Application Field

The LM25115SDX is ideal for a variety of applications such as over-voltage protection, battery-powered systems, slim POL converters, multi-rail point-of-load converters, automotive applications and industrial systems. Additionally, due to its compact size, the LM25115SDX is suitable for space-constrained applications in consumer and automotive electronics.

Working Principle

The LM25115SDX is a power regulation device that operates by driving a top switch in the synchronous buck converter. The high-side switch is a NMOS with an internal capacitance of up to 10 nF. The voltage across the switch is sensed and regulated with an internal error amplifier. A voltage signal is delivered to the gate of the switch to adjust the duty cycle of the buck converter and in turn, regulate the output voltage.

The regulator further features a fast transient response (typically 500 ns) with no additional external components. The LM25115SDX adjusts the output voltage according to the input voltage and includes features such as power-good indicator, enable pin, level-shift pin and short-circuit protection. It can be operated in both continuous or discontinuous mode with a wide range of output voltage selection and operating frequencies.

The LM25115SDX is the ideal choice for many switching power supply applications due to its wide input voltage range, fast transient response, low external component count and excellent thermal performance. It is available in 10-lead TSSOP and 20-lead DIP packaging options and is designed to meet the stringent requirements of automotive and industrial applications.

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