LMR61428XMMX/NOPB

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The LMR61428XMMX/NOPB is a synchronous step-down regulator with superior efficiency and small form factor, boasting ease of use and greater stability. It is designed for applications demanding constant current and voltage over varying temperature and load levels. Specifically, the NOPB (National Semiconductor package) integrates a PMOS power switch and an ideal diode into a tiny and sustainable form factor.

The LMR61428XMMX/NOPB offers a wide range of adjustable output voltage and current levels, ideal for applications purchased in bulk and requiring different voltages and currents. It also allows users to program the output voltage, current, switch frequency and gain, reducing design time while achieving maximum flexibility.

The LMR61428XMMX/NOPB is well equipped to maintain efficient operation and low power consumption in cases where high input-voltage step-down voltage is required or low-ripple DC-DC conversion. It contains a voltage-feedback loop with precision, low-drift 1.25V reference (at no-load) for maximum stability and superior performance. It has a wide input voltage range from 4 to 28V, the ability to source 3A or sink 4A of peak current with a thermal shutdown, and variable switching frequency up to 1.2 MHz.

The LMR61428XMMX/NOPB works on a synchronous-rectified-buck design, using a PMOS power transistor as the switch, and is enabled/disabled using logic on the enable pin. It must be toggled low in order to turn on and high in order to turn off. The enable pin behaves differently when low: it will turn on and remain on while held low. The enable is a convenience pin that supports ON/OFF transition.

The LMR61428XMMX/NOPB has a built-in soft-start, which eliminates the need to recalibrate the output. Soft-start is key in ensuring the device is not overly stressed on initial turn-on, helping to extend its lifetime and maintain accurate operation. Additionally, it also features a power-good output that indicates the presence of output voltage.

The LMR61428XMMX/NOPB is designed with a patented active loop feature which operates on a two-stage diode-OR-sync loop architecture that helps improve efficiency even at light load. It utilizes a combination of different components to control the adaptive body diode, to improve EMI performance by reducing the low-frequency switching noise. Due to its high performance, long lifetime, and multiple output levels, the LMR61428XMMX/NOPB is ideal for a variety of applications, particularly those requiring constant voltage and current over varying temperatures.

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