MP1591DN-LF

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The MP1591DN-LF is a DC-to-DC switching regulator designed to provide stable regulated output voltage from an input range from 4V to 28.5V. It features integrated high efficiency MOSFET switches, programmable switching frequency and adjustable peak current limit for switch operating within the temperature range from -40°C to +125°C. The MP1591DN-LF is available in a SOP-8 package and offers low standby current consumption and low quiescent current for low noise, high efficiency, and high power density performance in a variety of applications.

Application Field

The MP1591DN-LF is ideal for point-of-load (POL) applications such as data center controllers, network switches, industrial and consumer electronics. Specifically, this device can be used as an intermediate voltage level transformer to convert an input voltage between 4V and 28.5V to an output voltage at 5V, 7.5V or 12V, or in non-isolated voltage converter applications to generate intermediate or output voltages between 2V and 24V.

Working Principle

The MP1591DN-LF is a pulse-width modulation (PWM) regulator with an integrated high-efficiency MOSFET switch. It implements a fixed frequency, current mode control architecture. A constant voltage on the FB pin is maintained by the error amplifier, which compares the FB voltage to an internal reference voltage. When the output voltage deviates from the set point, the error amplifier acts to increase or decrease the width of the pulses that the driving MOSFET is switched on, thus controlling the output voltage. The efficiency of this technique can be increased by increasing the pulse widths, but at the cost of increased ripple and lower transient response.

The switching frequency of the device is externally programmable and is adjustable between 300kHz and 1MHz. Also, the peak current limit of the MOSFET switch can be externally set to adjust the current limit according to the power requirements of the system. This allows the device to operate efficiently even with light loads.

At the same time, the MP1591DN-LF employs a low-noise mode which suppresses the fast transient noise generated by the switching MOSFET and helps reduce the total EMI noise of the system. The adjustable over-temperature protection feature helps to prevent thermal runaway of the MOSFETs.

Conclusion

The MP1591DN-LF from Microsemi is a high-efficiency DC-to-DC switching regulator specifically designed for data center controllers, network switches and other such applications. It features integrated MOSFET switches, adjustable switching frequency and adjustable peak current limit, making it ideal for a wide range of voltage conversion applications. Lastly, its low standby and quiescent current costs make it an optimal choice for low noise, high efficiency and high power density performance.

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