LM25117QPSQE/NOPB

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The LM25117QPSQE/NOPB is a high-performance synchronous buck regulator that operates from an input voltage of up to 30 V. With its synchronous rectification, it outperforms traditional non-synchronous regulators in terms of efficiency and delivers up to 9 A of continuous output current. The operating frequency is programmable from 200 kHz to 2.2 MHz, allowing for optimization of performance, size and cost. Integrated features include a low-side sense resistor, soft start, output voltage programming, and current limit. The LM25117QPSQE/NOPB is available in a 10-pin PowerPAD™ package and is ideal for high-density applications where size and weight are constraints.

The LM25117QPSQE/NOPB belongs to the PMIC (Power Management IC) family and is categorized as a Voltage Regulator in the DC DC Switching Controllers subgroup. To understand the operating principle of this controller, it is important to understand the fundamentals of synchronous buck regulators.

A synchronous buck regulator is a switching converter circuit that converts an input voltage to a lower output voltage with a fixed switchover ratio. It does so by switching a transistor to charge and discharge the output capacitor. The input capacitor regulates the current drawn from the source, so that the output stays steady despite input voltage changes, and a sense resistor from source to ground is used to monitor the current. The controller is responsible for driving the low-side switch to turn on and off at an appropriate time and for regulating the output voltage.

The LM25117QPSQE/NOPB controller is a synchronous buck regulator specifically designed for high-density applications. It has a 100 mV maximum sense voltage with current monitoring up to 9 A. The operating frequency can be programmed from 200 kHz to 2.2 MHz, and a synchronization input is also available for applications that require multiple LM25117QPSQE/NOPB controllers to operate in phase with each other. The device also provides soft start capability to limit inrush current and output voltage programming through an external voltage divider. The low-side sense feature helps to eliminate the need for an external sense resistor. Overall, the LM25117QPSQE/NOPB is a high-performance and flexible synchronous buck regulator that is ideal for a variety of power-conversion applications.

The LM25117QPSQE/NOPB can be used in a variety of applications such as automotive, computing, and Internet-of-Things (IoT). In automotive applications, the regulator can be used for LED headlight, cooling fans, and stop/start systems. In computing and communication applications, it is suitable for powering DC-DC modules, 12 V GPUs and low-profile computer motherboards. In IoT applications, it is well-suited for battery chargers, data communication, and embedded systems.

In conclusion, the LM25117QPSQE/NOPB is a high-performance synchronous buck regulator with a wide input voltage range up to 30 V and continuous output current up to 9 A. It features a low-side sense resistor, soft start, output voltage programming, and current limit. With its flexible and low-profile design, the LM25117QPSQE/NOPB is an ideal choice for high-density and power-conversion applications.

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