LM25117PSQ/NOPB

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The LM25117PSQ/NOPB application field and working principle can be categorized to PMIC – Voltage Regulators – DC DC Switching Controllers since the device adopts an efficient, synchronous, dual-mode, step-down control scheme. This voltage regulator can provide a simple, fixed-frequency, current-mode control solution with a wide operating range with its 40V wide input voltage. And it is housed in an easily-handled, thermally-enhanced TSSOP-14 package.

As to its working principle, the LM25117PSQ/NOPB implements a constant on-time control architecture that integrates the power MOSFETs, inductor current sensing, voltage feed-forward, and fault protection features. The external components connected to the control voltage compensation pin network are determined by the application’s feedback resistor feedback network, compensating for current-mode or voltage-mode operations. It also has a power-good flag for monitoring the output voltage.

LM25117PSQ/NOPB is a general-purpose, single buck converter and can be used in a variety of applications, such as powering CPU cores, SoCs, FPGAs and memory in the portable and communications equipment. Compared to the existing devices, the LM25117PSQ/NOPB can achieve extremely low system power consumption due to its 1.5V to 5.5V internal regulator, entering into 5-10 μA quiescent current. Besides, it also has a very low inrush current of 0.1A at the output, providing very low ESR/ESL reactive energy losses.

Moreover, the LM25117PSQ/NOPB further benefits from many features such as a 0.5% reference accuracy, an adjustable switching frequency up to 1.2MHz, a selectable soft-start or current-limited startup, and an adjustable loop compensation with external resistors. Other features of the LM25117PSQ/NOPB include −4V to −10V undervoltage and 30ms overvoltage lockout timing, 1A overcurrent protection, thermal shutdown, programmable output for fast/slow slew mode, 1.4V/4.4V Gate drive, and improved EMI. It is suitable for operating environments in industrial, automotive, and communications applications.

In conclusion, LM25117PSQ/NOPB is an inexpensive synchronous, dual-mode, step-down voltage regulator targeting communication, portable, and other consumer electronics applications. It is powered by an efficient, synchronous, dual-mode, step-down control scheme. This voltage regulator can provide a simple, fixed-frequency, current-mode control solution with a wide operating range with its 40V wide input voltage. It also has many useful features such as adjustable switching frequency up to 1.2MHz, selectable soft-start or current-limited startup, adjustable loop compensation with external resistors, and −4V to −10V undervoltage and 30ms overvoltage lockout timing. With its excellent performance and features, the LM25117PSQ/NOPB is an excellent choice for remotely powering fanout applications in consumer, industrial and automotive markets.

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