LTC1551LCS8#TRPBF

Voltage - Output (Min/Fixed):	-1.225V
Base Part Number:	LTC1551
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 70°C (TA)
Synchronous Rectifier:	No
Frequency - Switching:	900kHz
Current - Output:	20mA
Voltage - Output (Max):	-4.8V
Series:	--
Voltage - Input (Max):	5.5V
Voltage - Input (Min):	2.7V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Charge Pump
Output Configuration:	Negative
Function:	Step-Up/Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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LTC1551LCS8#TRPBF Application Field and Working Principle

Fast switching Buck Regulators are one of the most popular solutions for power regulation and management. The LTC1551LCS8#TRPBF, from Linear Technology, is a great example of switching regulators for DC/DC conversion applications to meet the power supply requirements for the modern electronics.

Features

The LTC1551LCS8#TRPBF is a high performance buck regulator with a 54V nominal input voltage and 8A continuous DC/DC output current. It also has an adjustable voltage output setting which allows it to regulate the current as desired. Moreover, this device has an adjustable switching frequency which ranges from 20 kHz to 500 kHz and a synchronizable switching frequency feature which makes it suitable for achieving a flexible range of different applications. The wide Vin features of the reguator make it suitable for most of the industrial applications and the adjustable switching frequency provides it with the flexibility to be used in applications with high current load and low power consumption. The LTC1551LCS8#TRPFB also has a low quiescent current in shutdown mode which ensures efficient power conversion. In addition, it also has high current performance, short circuit protection, over temperature protection and soft start circuit, which allows the buck regulator to work safely and stably in most applications.

Application

The robustness and versatility of the LTC1551LCS8#TRPBF make it suitable for wide range of applications, such as industrial and commercial applications, telecommunications, solar cells, DC to DC converters, motor drives, audio power amplifiers and other general purpose voltage regulation. Moreover, the synchronizable frequency feature of this buck regulator makes it suitable for increasing the efficiency of the power supply system when designed for high switching frequencies. The regulator can convert 54V DC-input voltage into an adjustable 1.2V to 6V DC output voltage. It also can deliver up to 8A continuous DC/DC output current, up to 10A peak, with a high efficiency of up to 95%.

Working Principle

The LTC1551LCS8#TRPBF is an integrated buck regulator circuit that consists of two main parts, an active semiconductor switch and an inductor. The switch is responsible for controlling the current flow between a positive supply voltage and a negative voltage, both connected to the load. An input control signal is used to control the switch, allowing it to transfer energy from the power supply to the load.The output voltage of the buck regulator is determined by a resistor divider connected to the output and the voltage reference. This voltage reference is provided from an external voltage source and is used to compare the output voltage to the desired output level. After switching, the voltage drop across the switch is regulated by the inductor. The buck regulator then makes an internal comparison between the regulated voltage and the voltage reference, and adjusts the control signal accordingly to ensure the correct output voltage.

Conclusion

The LTC1551LCS8#TRPBF is an integrated buck regulator designed by Linear Technology that features high-performance and adjustable switching frequency of up to 500KHz. The adjustable voltage output setting, low quiescent current in shutdown mode, and the wide Vin features make this device suitable for various applications. The synchronizable frequency feature allows it to increase the efficiency of the power supply system when designed for high switching frequencies, which makes it ideal for industrial and commercial applications, telecommunications, solar cells, DC to DC converters, motor drives, audio power amplifiers and other general purpose voltage regulation.

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