LM2591HVSX-ADJ/NOPB Integrated Circuits (ICs)

Voltage - Output (Min/Fixed):	1.2V
Base Part Number:	LM2591
Supplier Device Package:	DDPAK/TO-263-5
Package / Case:	TO-263-6, D²Pak (5 Leads + Tab), TO-263BA
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	150kHz
Current - Output:	1A
Voltage - Output (Max):	57V
Series:	SIMPLE SWITCHER®
Voltage - Input (Max):	60V
Voltage - Input (Min):	4.5V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Overview

The LM2591HVSX-ADJ/NOPB is a high-performance, adjustable, step-down DC/DC converter with a wide compatibility range of input voltage. It keeps the output voltage steady, thereby maintaining stable power supply. This highly flexible voltage regulator is suitable to be used in mobile phones, tablets, electronic wristwatches, printers, medical equipment, automotive and other industrial applications.

Application Field

The LM2591HVSX-ADJ/NOPB is widely used for reducing the input voltage to the desired level for various applications in communication technology, industrial automation, renewable energy systems, smart grids, and automotive electronics. Its adjustable output voltage and its wide input voltage range make it suitable for most of the applications. For example, it can be used in mobile phones or tablets to reduce the battery voltage from 5V up to 28V to selected levels which are necessary for the processor power supply, display power supply and other main system circuits. It can effectively reduce the battery’s voltage while still delivering both high current and power with high efficiency.It can also be used as a point of load regulator in computers, servers and other network systems to provide steady power supply by reducing the voltage when necessary and regulate higher currents. In automotive electronics, it can be used to regulate the 12V input voltage found in cars and trucks to the desired level for powering and charging the required electronics. In addition, it can be used in solar systems, renewable energy sources, smart grids and other networks which require efficient and steady power conversion.

Working Principle

The LM2591HVSX-ADJ/NOPB is a DC/DC constant current linear step-down converter with an adjustable output voltage. It can efficiently reduce the voltage from battery or AC-DC power supplies to the desired level. It consists of an operational amplifier and a MOSFET pass transistor. The operational amplifier is responsible for the voltage regulation and feedback loop. It compares the difference between the output voltage and the externally preset voltage reference. The error amplifier output is then fed to the pass switch in a proportional way to control its current flow. The voltage buffer is responsible for output current protection. It monitors the current-flow across the MOSFET and switches it off when it exceeds a pre-determined level. The protection circuit can also be used to reset the device if it turns off due to an overvoltage condition. The LM2591HVSX-ADJ/NOPB’s output is stable, reliable and accurate and it offers adjustable output voltage. The wide input voltage range and adjustable output voltage makes it suitable for most applications. It has high efficiency, fast transient response and high power density. The device comes in a 16-pin thermally-enhanced, SOIC package with exposed metal pad for superior thermal performance.

Conclusion

The LM2591HVSX-ADJ/NOPB is a high-performance, adjustable, linear step-down DC/DC converter that is suitable for many applications. It offers adjustable output voltage, wide input voltage range and high efficiency. Its advanced features make it appropriate to be used in communication, industrial automation, automotive and other systems which require accurate and steady power supply.

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