LT3685IDD#PBF

Voltage - Output (Min/Fixed):	0.79V
Base Part Number:	LT3685
Supplier Device Package:	10-DFN (3x3)
Package / Case:	10-WFDFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	200kHz ~ 2.4MHz
Current - Output:	2A
Voltage - Output (Max):	20V
Series:	--
Voltage - Input (Max):	36V
Voltage - Input (Min):	3.6V
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 to LT3685IDD#PBF

The LT3685IDD#PBF is a DC/DC switching regulator from Linear Technology’s family of energy efficient, ultra low-power regulators. This device is a highly integrated solution that includes a voltage regulator, a switching regulator, and a programmable frequency oscillator with built-in feedback limit.

Application Field

Due to its simple structure and high efficiency, the LT3685IDD#PBF is ideal for applications ranging from portable devices such as cell phones and PDAs to high current projects such as found in automotive and industrial applications. The LT3685IDD#PBF supports Vin from 4.5V to 42V, and offers up to 4A of output current. It also integrates a low-power shutdown mode and a programmable current limit.

Working Principle

The LT3685IDD#PBF works by exchanging energy between the input and output terminals of the device. It consists of a PWM switching stage, which regulates the power exchange on the high-side and low-side switch, and a linear regulator, which stabilizes the output voltage.When operating in the regulated mode, the voltage on the input is applied to the base of the high-side switch while the output voltage of the regulator is connected to the base of the low-side switch. This creates two separate voltage-controlled current paths, one from the input to the output and the other from the output to the ground.When the high-side switch is closed and the low-side switch is open, the voltage drop between the input and output terminals is equal to the output voltage, and energy is exchanged from the input to the output. When the low-side switch is closed and the high-side switch is open, the voltage drop between the input and output is equal to the ground, and energy is exchanged from the output to the ground. This exchange is regulated by the current limit, which prevents excessive levels of current, and by the PWM frequency, which determines the average power delivered to the output.

Conclusion

The LT3685IDD#PBF is a versatile and highly efficient DC/DC switching regulator that can be used in a wide range of applications. Its simple structure and the ability to integrate a low-power shutdown and programmable current limit make it an ideal choice for power conversion and regulation in projects ranging from portable devices to high current projects.

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