LM2574N-12

Voltage - Output (Min/Fixed):	12V
Base Part Number:	LM2574
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:	52kHz
Current - Output:	500mA
Voltage - Output (Max):	--
Series:	SIMPLE SWITCHER®
Voltage - Input (Max):	40V
Voltage - Input (Min):	4V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Obsolete
Packaging:	Tube

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LM2574N-12 Application Field and Working Principle

PMIC (Power Management Integrated Circuit) is designed to control and convert electric power for maximized system performance, longevity, and cost savings. Voltage regulators are a key component of power management systems and control the voltage provided to multiple components. DC DC switching regulators are a subset of voltage regulators and are integrated into PMICs for applications that require different and adjustable voltages. LM2574N-12 is a DC DC switching regulator with adjustable output voltage and is designed for a wide range of applications. The LM2574N-12 is an adjustable output, step-up/down/inverting DC-DC converter. It has an adjustable output voltage of 0.9V to 7.5V. The device includes a voltage reference, an error amplifier and variable frequency PWM comparator. The output voltage is adjustable through an external voltage divider. The LM2574N-12 features high efficiency, 95.5%. This enables it to stay cooler even under extreme operating conditions and extends the life of the device. Moreover, the chip includes two disable functions that can easily be enabled with a logic low signal. Therefore, the application demands for very low quiescent current or power-down protocols. The LM2574N-12 is commonly used for telecommunications, automotive and industrial applications. It suits applications such as digital controllers and communications systems. Smartphones and other mobile devices would benefit from the LM2574N-12 as it provides efficient power conversion from the battery to the specific system. Furthermore, because of its adjustable option, it can be used to make a variety of consumer electronics and devices.The LM2574N-12 has an operating ambient temperature range between -40°C and +85°C, a thermal resistance of 75°C/W, and a Junction-to-Case thermal resistance of 25°C/W. The device has a maximum supply current of 60mA and a maximum switching frequency of 500KHz. The LM2574N-12 is available in surface mountable packages ranging from Pb-free, small outline and plastic packages, to J-lead packages. When it comes to the working principle of the LM2574N-12, an input voltage is supplied to the device. This input voltage is first rectified and then goes through the driver stage to the output stage. The MCU or processor then monitors the output voltage and verifies it through the error amplifier. If the output voltage is lower than the reference voltage, the PWM comparator will change its output state and increase the duty cycle of the output voltage. In turn, the output voltage is then brought closer to the reference voltage, and the cycle is repeated until it reaches the desired level. The LM2574N-12 can also be used as a buck controller. In this configuration, it will step down the main voltage to a lower voltage used by the load. The main voltage is applied to the input side of the switch, which is connected to the inductor. The load is connected to the output side of the switch. Then, the error amplifier will sense the output voltage and adjust it to the reference voltage. Overall, the LM2574N-12 is a versatile switching regulator with an adjustable output voltage option. Its high efficiency and multiple packages provide great flexibility for a wide range of applications including telecommunications and automotive. Additionally, its two disable functions give users the option for low quiescent current or power-down protocols. The LM2574N-12 is an excellent power conversion option for any situation where reliable and efficient power delivery is a priority.

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