LM2594N-ADJ/NOPB

Voltage - Output (Min/Fixed):	1.2V
Base Part Number:	LM2594
Supplier Device Package:	8-PDIP
Package / Case:	8-DIP (0.300", 7.62mm)
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	150kHz
Current - Output:	500mA
Voltage - Output (Max):	37V
Series:	SIMPLE SWITCHER®
Voltage - Input (Max):	40V
Voltage - Input (Min):	4.5V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tube

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• Introduction of LM2594N

LM2594N is a high efficiency, monolithic, step-down DC-DC switching regulator that can be used for a variety of applications such as power supply, CPU core voltage, low power standby mode and power line supply monitoring. With a low quiescent current requirement, integrated over-temperature protection, and constant frequency operation, LM2594N-ADJ/NOPB is an ideal choice for a variety of space-constrained applications.

• Applications of LM2594N

The LM2594N-ADJ/NOPB can be used for a variety of applications, including but not limited to the following.1. High Efficiency DC-DC Step-Down Converter: Due to its high efficiency and low quiescent current requirements, the LM2594N-ADJ/NOPB is an ideal choice for power supplies requiring high power efficiency and low output voltage ripple.2. PC Motherboard Voltage Regulation: With its wide output voltage range, the LM2594N-ADJ/NOPB is well-suited for PC motherboard applications requiring a wide variety of supply voltages.3. Notebook and Mobile Computing Power Supplies: With its low quiescent current requirements, wide input voltage range and shutdown mode, the LM2594N-ADJ/NOPB is a great choice for notebook and mobile computing power supplies.4. Low Power Standby Mode Supply: With its low quiescent current requirements and wide input voltage range, the LM2594N-ADJ/NOPB is well-suited for low power standby mode supply applications.5. Power Line Supply Monitoring: With its wide input voltage range and constant frequency switching, the LM2594N-ADJ/NOPB is well-suited for power line supply monitoring applications.

• Working Principle of LM2594N

The LM2594N-ADJ/NOPB is a high efficiency, monolithic, step-down DC-DC switching regulator designed for a variety of applications such as power supply, CPU core voltage, low power standby mode and power line supply monitoring. It features a high efficiency synchronous PWM switching controller, high voltage MOSFETs and an ideal diode.The LM2594N-ADJ/NOPB has an adjustable output voltage range from 0.8 V to 5.0 V. The input voltage range of 6 V to 35 V allows for wide operating environments. It provides up to a 9.5 A maximum output current and has an efficient synchronous rectifier for minimum power loss.The LM2594N-ADJ/NOPB is designed for operation in constant frequency mode. In this mode, the switching frequency is programmed internally at a fixed frequency of 250 kHz. This constant switching frequency reduces system noise by keeping the switching frequency at a constant level. In addition, the fixed frequency operation also provides a more consistent regulation loop performance and behavior. When the output voltage reaches a maximum or minimum limit, the LM2594N-ADJ/NOPB will switch to pulse-skip mode. This mode provides further reduction of power loss in light load conditions.A current overload protection circuit is included and is designed to be used in parallel with the load. The protection circuit will immediately shut down the LM2594N-ADJ/NOPB if an overcurrent condition occurs. The LM2594N-ADJ/NOPB also features an internal thermal protection circuit. This circuit senses the temperature of the LM2594N-ADJ/NOPB and will shut down the device if the internal temperature of the device reaches a pre-determined limit.The LM2594N-ADJ/NOPB also features an enable pin that can be used for power control. When the enable pin is at a logic low, the regulator is in shutdown mode and the device will consume nearly no power; when the enable pin is at logic high, the device is in a normal operation mode and the output voltage is regulated.

• Conclusion

The LM2594N-ADJ/NOPB is a high-efficiency, monolithic, step-down DC-DC switching regulator designed for a variety of applications including power supply, CPU core voltage, low power standby mode and power line supply monitoring. It features a wide input voltage range of 6 V to 35 V and adjustable output voltage range from 0.8 V to 5.0 V. The LM2594N-ADJ/NOPB has an efficient synchronous rectifier for minimum power loss, current overload protection circuit, and an internal thermal protection circuit. It also features a fixed frequency operation of 250 kHz, which reduces system noise, and provides a more consistent regulation loop performance and behavior. The LM2594N-ADJ/NOPB is an ideal choice for a variety of space-constrained applications.

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