LTC1551LCS8-4.1#TRPBF

Voltage - Output (Min/Fixed):	-4.1V
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):	--
Series:	--
Voltage - Input (Max):	5.5V
Voltage - Input (Min):	4.5V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Charge Pump
Output Configuration:	Negative
Function:	Step-Up/Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The LTC1551LCS8-4.1#TRPBF is an integrated high-density, high-performance switching regulator DC-DC converter designed to provide an efficient and reliable power solution to mobile and portable applications which require step-down converters from a 3.0 to 6.0V input voltage and up to 4.1V output voltage. Featuring a low quiescent current of 330nA and a high efficiency, it can be used for a variety of applications such as bootstrapping of source drains, load switching, audio amplifiers, and battery-powered systems, as well as providing precise output voltage and current. This article discusses the general application field and the working principle associated with the LTC1551LCS8-4.1#TRPBF switch regulator.

Application Field

The LTC1551LCS8-4.1#TRPBF is designed to provide an efficient and reliable power solution to a variety of applications. It is ideal for applications which require precise output voltage and current, such as bootstrapping of source drains, load switching, audio amplifiers, and battery-powered systems. It can be used as a load switch for DC/DC converters with a 3.0 to 6.0V input voltage, with a high output voltage of up to 4.1V. Additionally, its high efficiency supports longer battery life and reduces energy consumption.The device offers integrated auto-restart protection and is capable of supplying an adjustable output voltage, enabling it to support systems which require multiple output voltages and fast transient responses. Its high switching frequency, high efficiency design and low quiescent current make it an ideal choice for a wide range of applications. It also provides protection against inrush current, over-current and over-temperature conditions.

Working Principle

The LTC1551LCS8-4.1#TRPBF is a high-density, high-performance synchronous switching regulator which functions by controlling the flow of current from the input source and routing it to the load. It is capable of accepting input voltage from 3.0 to 6.0V, with a maximum output voltage of 4.1V.The device employs a buck topology with a pulse width modulation (PWM) controller, allowing for precise output voltage control. The PWM controller modulates the power delivered to the load by controlling the ON and OFF times of the switch. The transistors act as the switches and are alternately switched ON and OFF as per the demands of the load.The current sense amplifier monitors the current flow through the switch and provides feedback to the PWM controller, allowing it to adjust the pulse width accordingly. The output voltage is then regulated via the voltage loop and error compensation network.In order to improve efficiency and reduce the heat dissipation of the device, the output voltage is synchronized with the switching frequency of the controller. This ensures that the output of the device is on the same frequency as the input, and helps reduce the power loss caused by unnecessary voltage differences.The LTC1551LCS8-4.1#TRPBF also offers a range of protection features to protect the device from inrush current, over-current, and over-temperature conditions. These features make the device ideal for mobile and portable applications, where a reliable and efficient power solution is required.

Conclusion

The LTC1551LCS8-4.1#TRPBF is an integrated high-density, high-performance switching regulator DC-DC converter designed to provide an efficient and reliable power solution to mobile and portable applications. It features a low quiescent current of 330nA and a high efficiency design, and is capable of providing an adjustable output voltage. The device operates as a buck converter, employing a PWM controller to control the ON and OFF times of the switch to regulate the flow of current. It also provides protection against inrush current, over-current, and over-temperature conditions. This makes the LTC1551LCS8-4.1#TRPBF a great choice for a wide range of applications including bootstrapping of source drains, load switching, audio amplifiers, and battery-powered systems.

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