LTC3600EDD#TRPBF

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LTC3600EDD#TRPBF Application Field and Working Principle

The LTC3600EDD#TRPBF is a widely used synchronous monolithic step-up/step-down DC-DC converter with an integrated switch developed by Linear Technology. It is a device family of highly integrated synchronous buck/boost converters, with six members offering input voltages from 3 V to 28 V, and two members offering 5 V output. The step-up converter is recommended for use with a 5 V output voltage. In this type of switched-mode power supply, the output voltage is regulated by adjusting the duty cycle of the switch.

The device provides numerous features and options, such as over-current protection, under-voltage protection, over-voltage protection, over-temperature protection, as well as several different output voltage ranges. This makes it ideal for use in a wide variety of applications, including computer, communications, automotive and industrial systems.

Features of LTC3600EDD#TRPBF

• High efficiency up to 92%
• Internal current limit
• Good line and load regulation
• Integrated soft-start
• Output voltage range 2.5V to 28V
• 100% duty-cycle operation
• Low quiescent current – 75μA typ

Applications

• Voltage regulators
• Portable devices
• Battery-powered systems
• Notebook and netbook computers
• Cellular phones
• Digital cameras
• Laptops

Working Principle

The LTC3600EDD#TRPBF switches the power supply with an integrated MOSFET switch connected to the LDO (Linear Drop-Out) regulator, which allows the input to be regulated and the output voltage to be determined by the duty cycle of the switch. The duty cycle is determined by a feedback loop, which monitors the voltage levels of the output and adjusts it by means of a Pulse Width Modulation (PWM) signal. The PWM signal is generated by an internal oscillator and converted into an analog signal using a Digital-to-Analog Converter (DAC). The on-off times of the switch will be determined by the relative amounts of time that the switch is on and off, which in turn determines the duty cycle and the load regulation of the converter.

In order to reduce the current ripple and noise on the output voltage, an inductor is used to smooth the output voltage. The inductor stores energy in the form of a magnetic field and allows for a smooth voltage output since it lags the current flow, this helps reduce the switching noise. The efficiency of the converter depends on the components used, the input voltage and the output current.

The LTC3600EDD#TRPBF provides all of the necessary protection, allowing the device to operate in wide range of applications. The device features integrated current limit, thermal shutdown and over-voltage protection, which can offer protection against short circuits and abnormal temperatures.

Conclusion

The LTC3600EDD#TRPBF is a popular IC for switching between buck and boost voltage regulator configurations. By using an integrated switch connected to the LDO regulator, and a feedback loop for regulation, this device is able to adjust its duty cycle to ensure a regulated output voltage. With a wide range of features, a high efficiency up to 92%, as well as integrated protections, the LTC3600EDD#TRPBF is versatile and reliable device suitable for a range of applications from computer and communications to automotive and industrial.

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