LT3991IDD#TRPBF

Voltage - Output (Min/Fixed):	1.19V
Base Part Number:	LT3991
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 ~ 2MHz
Current - Output:	1.2A
Voltage - Output (Max):	30V
Series:	--
Voltage - Input (Max):	55V
Voltage - Input (Min):	4.3V
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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LT3991IDD#TRPBF Application Field and Working PrincipleThe LT3991IDD#TRPBF is a DC-DC switching regulator designed by Linear Technology (Linear Technology is a leading-edge technology company specialized in the designs and manufacture of analog, mixed-signal, and high-performance power management integrated circuits). It is categorized in the Power Management Integrated Circuit (PMIC) section of Voltage Regulators and DC-DC Switching Regulators. This device is unique for its user friendly design and its high performance operation.The LT3991IDD#TRPBF has a wide range of applications, mainly for three-terminal, adjustable switch-mode dc-dc converter. It can provide high-efficiency step-down regulation from a high voltage input power supply, typically 8V to 32V, while providing adjustable output voltage to a wide range of loads. This integrated circuit can provide up to 1.2A of output current.The device features additional features and benefits. With its high efficiency, the LT3991IDD#TRPBF allows for small size solutions. A low Voltage Start-Up input pin allows the device to be powered with a low voltage, such as 2.5V. The device also features a Power-Good output signal, operating at 1.7V, which gives an open drain logic signal indicating a proper output voltage regulation. Furthermore, the IC utilizes a Burst Mode operation, which helps reduce power consumption. This device is also protected against current limiting and thermal shutdown operations which improve its reliability.The LT3991IDD#TRPBF operates with a fixed switching frequency and includes a feedback loop for precise output voltage regulation. It also includes a Soft-Start pin which allows for controlling of the input voltage ramp whenever the device is turned on. This control helps reduce excessive inrush currents and helps prevent false shutdowns of the device.The LT3991IDD#TRPBF uses a standard Switch-Mode power supply design which requires few external components. This reduces the number of circuit board elements, simplifying the design and reducing overall board size. The switch-mode design is based on a voltage-controlled oscillator (VCO) circuit which produces a constant frequency signal. The switch is toggled at the frequency’s period. A signal transformer is used to transform the high current pulses generated by the switch cycling at the VCO frequency into an AC current, and a diode is used to rectify these pulses, creating the desired output voltage.Since the output voltage can be adjusted by changing the transformer’s turns ratio, the transformer is often referred to as an inductor. The output voltage can also be adjusted by changing the VCO frequency, which can be done by changing the frequency divider equation’s various components. The frequency divider is based on resistors and capacitors connected to the oscillator. By controlling the amount of resistance and capacitance with thin-film on the die, the VCO frequency can be tailor-made for the desired output voltage, allowing more flexibility than a transformer-based design.The LT3991IDD#TRPBF DC-DC switching regulator is a versatile and reliable device for a wide range of applications. With its user friendly layout, few external components, and high performance operation, this device is a great choice for a variety of applications.

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