LTC3872ITS8-1#TRPBF

Frequency - Switching:	550kHz
Base Part Number:	LTC3872
Supplier Device Package:	TSOT-23-8
Package / Case:	SOT-23-8 Thin, TSOT-23-8
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Current Limit, Enable, Soft Start
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	--
Series:	--
Voltage - Supply (Vcc/Vdd):	2.75 V ~ 9.8 V
Output Phases:	1
Number of Outputs:	1
Topology:	Boost
Output Configuration:	Positive
Function:	Step-Up
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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LTC3872ITS8-1#TRPBF DC-DC Switching Controller

The LTC3872ITS8-1#TRFPB is a DC-DC switching controller from Linear Technology Corporation. It offers an adjustable output voltage from 0 V to 32 V and is capable of delivering up to 20A of current. The LTC3872-series of DC-DC switching controllers feature an internal current sense amplifier, an adjustable soft-start, an adjustable input and output land, and a built in MOSFET drivers. This makes the LTC3872-series of controllers ideal for a variety of different applications.

Application Field

The LTC3872-series of DC-DC switching controllers can be used as in a variety of different applications, such as:• DC-DC converters•Server and embedded power supplies• High-quality point-of-load DC-DC converters• Automotive power supplies• Battery chargers• LED lighting• Industrial automation and controlIn addition, the LTC3872-series are suitable for converting both relatively small and large POWER sources into usable voltages for various types of electronic devices.

Working Principle

The LTC3872-series of DC-DC switching controllers use a constant-on-time (COT) synchronous buck-converter topology. This topology uses a pulse-width modulated voltage to control the output voltage. The duty cycle of the modulating voltage is determined by comparing the output voltage to the power supply’s feedback voltage. If the feedback voltage is lower than the output voltage, then the duty cycle is increased. Conversely, if the feedback voltage is higher than the output voltage, then the duty cycle is decreased. In this way, The LTC3872-series is able to adjust the output voltage as required with an accurate response while maintaining a high efficiency. The controller also features an adjustable current-sensing threshold, which allows the user to easily identify when the overload current limit has been reached and adjust it accordingly. The adjustable soft-start feature of the LTC3872-series ensures smooth and noise-free operation when starting up by gradually increasing the output voltage from zero. This also helps to reduce inrush current and ensure that the circuitry is protected from overvoltage. Finally, the MOSFET drivers of the controllers are capable of both sourcing and sinking current, which helps to increase the overall efficiency of the system.

Conclusion

The LTC3872ITS8-1#TRPBF DC-DC switching controller from Linear Technology is a powerful, versatile device that is suitable for a wide range of applications. It features a variety of advanced features, such as an adjustable current-sensing threshold, an adjustable soft-start, and MOSFET drivers with both sourcing and sinking capabilities. All of these features make the LTC3872-series of controllers an ideal choice for a variety of different applications.

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