LM5056PMHX/NOPB Integrated Circuits (ICs)

LM5056PMHX/NOPB Application Field and Working Principle

The LM5056PMHX/NOPB is a high performance, 36V, quad buck switching regulator with integrated 1.5A peak MOSFETs. It is a synchronous device that has a peak efficiency of 97%. The LM5056PMHX/NOPB is designed to provide four independent output voltages ranging from 0.6V to VIN(max) with the possibility of setting different output voltages for each channel. The device is optimized for point-of-load DC-DC converter applications with high switching frequencies and high current output, such as notebook and portable video equipment, wireless LAN equipment, automotive modules and any other application that requires efficient power management.

Features:

• 4 independent output buck converters
• Up to 36V input
• Up to 1.5A each load output current
• High efficiency - up to 97%
• Operation up to 1.5MHz
• Current mode control ensuring better system stability
• Programmable switching frequency
• Programmable track/sequence modes for independent load regulation
• Input undervoltage lockout protection
• Output short circuit protection
• Thermal shutdown protection

Applications:

• Notebook computers
• Server, portable video equipment
• Wireless LAN equipment
• Video printers
• Point-of-load converters
• Automotive modules

Working Principle:

The LM5056PMHX/NOPB operation can be divided into two parts: the synchronous rectification, which takes place during switching cycles and the constant voltage regulation. During the synchronous rectification part of operation, the device functions as an synchronous buck converter by driving two internal MOSFETs alternatively to convert the input voltage VIN to an adjustable output voltage VOUT for each channel. During the constant voltage regulation phase, the LM5056PMHX/NOPB monitors the output voltage of each channel and regulates it by adjusting the duty cycle of the corresponding MOSFETs.

The two internal MOSFETs are alternatively switched at high frequency (up to 1.5 MHz) to convert the input voltage VIN to an adjustable output voltage VOUT. When the upper MOSFET is turned on, the output voltage VOUT is discharged and a current is fed through the inductor. When the upper MOSFET is turned off, the lower MOSFET is turned on and the inductor current is discharged, thus producing an output voltage VOUT.

The LM5056PMHX/NOPB also includes a constant voltage regulation circuit, which allows precise control of the output voltage. This control circuit acquires the output voltage of each channel and adjusts the duty cycle of the MOSFETs accordingly to keep the output voltage of each channel within the specified range.

Overall, the LM5056PMHX/NOPB is an efficient, high-performance switching regulator designed to provide precise power management in demanding applications.