LM25018MR/NOPB

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The LM25018MR/NOPB is an adjustable monolithic, switch-mode dc-dc converter with true remote sensing capability, providing several features such as current limit protection, thermal protection, overvoltage protection and overcurrent protection. It comes in the tiny 1.6 mm * 1.6 mm SOT-23 package. This device can be used in industrial, communications and computing systems, and is ideal for distributed power architectures and point-of-load power applications.

The LM25018MR/NOPB provides up to 1 A of current output and a maximum of 6.3 A when used as a synchronous boost regulator. The output voltage can be set between 0.6 V to 6 V, and the input voltage range is from 2.5 V to 18 V. This device supports fixed frequency internal oscillator, external synchronization and programmable frequency up to 1 MHz. It also offers programmable soft-start, a run pin for quick Enable/Disable, and a power good pin to indicate the output is raised over 90% of its nominal value.

The LM25018MR/NOPB is a synchronous switch-mode dc-dc converter with a current-mode architecture, which provides improved response to line and load transient. The device operates in either a continuous or discontinuous mode, and supports both single-ended and differential input voltage and output voltage configurations. This device is available in an internally compensated version and has a fixed frequency of 500 KHz.

When the Enable and Oscillator pins are both high, the LM25018MR/NOPB will start switching. The oscillator frequency is determined by the external resistor Rf connected to the frequency adjust pin (F1). The output voltage (VOUT) is determined by the feedback voltage net VFB, and the current flow is regulated by the internal current-sense comparator, ISENSE. When VOUT reaches the limit set by VFB, the internal oscillator will be disabled and no conversion will take place.

When the EN pin is dropped to low level, the device enters the disable mode. In this mode, all output transistors are off and the device requires no power consumption. The VOL and VOH pins are shorted to the output to ensure no voltage differential when the EN pin is low. The device’s thermal shutdown circuitry monitors the IC die temperature and shuts the device down in the event of an over-temperature condition.

To conclude, the LM25018MR/NOPB is a monolithic, adjustable, synchronous switch mode DC-DC converter for high-performance applications. Its features include current limit protection, overvoltage protection, and overcurrent protection, enabling robust and reliable operation in distributed power architectures and point-of-load power applications.

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