LT3579IUFD#PBF

Series:	--
Packaging:	Tube
Part Status:	Active
Function:	Step-Up, Step-Up/Step-Down
Output Configuration:	Positive or Negative
Topology:	Boost, Charge Pump, Cuk, Flyback, SEPIC
Output Type:	Adjustable
Number of Outputs:	1
Voltage - Input (Min):	2.5V
Voltage - Input (Max):	16V
Voltage - Output (Min/Fixed):	1.215V
Voltage - Output (Max):	42V (Switch)
Current - Output:	6A (Switch)
Frequency - Switching:	200kHz ~ 2.5MHz
Synchronous Rectifier:	No
Operating Temperature:	-40°C ~ 125°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	20-WFQFN Exposed Pad
Supplier Device Package:	20-QFN (5x4)
Base Part Number:	LT3579

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<h2>LT3579IUFD#PBF Application Field and Working Principle</h2>LT3579IUFD#PBF is a member of the Linear Technology’s family of synchronous DC/DC switching regulators. This regulator is capable of outputting up to 1A in a variety of standard sizes. It is ideal for applications that require high efficiency, small size, and low output voltage dropout.<h3>Overview</h3>The LT3579IUFD#PBF switch mode regulator is a monolithic, synchronous, step-down regulator that operates over an input voltage range of 2.2V to 20V. The device uses an internal P-channel MOSFET as the switch and is capable of output voltage as low as 0.6V. The LT3579IUFD#PBF has a wide variety of features that make it ideal for a variety of applications. These features include: output voltage precision, soft-start, programmable switching frequency, and load disconnect.<h3>Application Fields</h3>The LT3579IUFD#PBF can be used in a variety of applications. The flexible input and output voltages make it suitable for a wide range of applications. Some common applications for the device are LED lighting, DC/DC converters, point-of-load regulation, and USB powered devices. The device is also ideal for use in portable electronics, due to its small packaging and low quiescent current.<h3>Working Principle</h3>The LT3579IUFD#PBF works by continuously converting the input voltage to the desired output voltage. The device uses an internal P-channel MOSFET as the switch and is capable of output voltage as low as 0.6V. During conversion, the input voltage is applied to the internal converter circuits, which then reduce the voltage to the desired output level. The internal converter circuit includes an error amplifier, an oscillator for setting the switching frequency, and an integrated driver for the internal MOSFET switch.When the input voltage increases above the desired output voltage, the internal error amplifier compares the output voltage to a reference voltage and increases the duty cycle of the switch. This increases the energy delivered to the output and thus increases the output voltage. When the input voltage decreases, the duty cycle of the switch is decreased, decreasing the energy delivered to the output, and thus lowering the output voltage.<h3>Conclusion</h3>The LT3579IUFD#PBF is a compact, low dropout synchronous DC/DC switching regulator. Its high efficiency, low quiescent current, and wide input/output voltage range make it ideal for a variety of applications such as LED lighting, DC/DC converters, point-of-load regulation, and USB powered devices. Its internal P-channel MOSFET switch, error amplifier, oscillator, and driver allow the device to precisely and efficiently convert input voltages to the desired output voltage.

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