LT3845AIFE#TRPBF

Frequency - Switching:	300kHz
Base Part Number:	LT3845
Supplier Device Package:	16-TSSOP-EP
Package / Case:	16-TSSOP (0.173", 4.40mm Width) Exposed Pad
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Enable, Frequency Control, Soft Start
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	Yes
Duty Cycle (Max):	--
Series:	--
Voltage - Supply (Vcc/Vdd):	4 V ~ 60 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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LT3845AIFE#TRPBF: Applications and Working Principle

The LT3845AIFE#TRPBF is an integrated circuit (IC) from Linear Technology in the category of Power Management and Control ICs. It falls in the subcategory of Voltage Regulators, DC-DC Switching Controllers, which is an IC that regulates the voltage input to an output voltage that is typically set with a reference voltage (VREF). The LT3845AIFE#TRPBF is a very high performance, high-efficiency Buck Controller with integrated high-current MOSFETs and low on-resistance drivers. It provides a low noise, efficient, fast-switching solution with very high output current and at a low cost.

Applications

The LT3845AIFE#TRPBF is ideally suited for many applications, most notably in portable devices such as tablets and phones. The IC can be used in both switching and linear charging systems, allowing it to be used in a wide range of electronic products. It is also suitable for a variety of other power management applications including DC-DC conversions, multi-phase buck converters, hot-swap systems and LED lighting. The IC is also a perfect choice for automotive systems due to its low voltage capabilities and low on-resistance drivers, which allows it to handle large switching currents without additional heatsink requirements.

Features

The LT3845AIFE#TRPBF features an integrated switching circuit with an efficient dual N-channel MOSFET pair, meaning that this IC provides high-efficiency, high-power rating, and fast switching. It is also the industry\'s highest performing and most cost effective Buck Controller with the ability to work with a wide input voltage range of 2.7 V to 24 V. The LT3845AIFE#TRPBF also features differential remote sensing, meaning that it can accurately regulate the output voltage over longer cables. In addition, it is able to monitor the power being delivered to the load, allowing for fast and accurate response to load transients for improved system performance. The IC also offers a full protection feature set, including thermal shutdown, UVLO, and OVLO.

Working Principle

The LT3845AIFE#TRPBF works by using current feed-forward control to regulate the output voltage in Buck converters. When the voltage on the output is higher than the reference voltage, the LT3845AIFE#TRPBF signals the control circuit to reduce the duty cycle in order to reduce the output voltage. When the voltage on the output is lower than the reference voltage, the LT3845AIFE#TRPBF signals the control circuit to increase the duty cycle in order to increase the output voltage. This enables the IC to accurately regulate the output voltage, resulting in a stable and efficient system operation.

Conclusion

The LT3845AIFE#TRPBF from Linear Technology is an integrated circuit which is ideally suited for power management applications in portable devices. It provides a high performance and high-efficiency Buck Controller solution with integrated high-current MOSFETs, differential remote sensing capabilities, and a full protection feature set. The LT3845AIFE#TRPBF is able to accurately regulate output voltages, plus monitor power being delivered to the load, making it a perfect choice for many applications.

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