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PMIC - Voltage Regulators - DC DC Switching Controllers

LTC3834EDHC-1#TRPBF is the newest in the series of DC to DC switching controllers in the power management integrated circuit (PMIC) family. It is designed to provide excellent power conversion efficiency in multiple topologies and architectures. It features a wide input voltage range from 6.5V to 55V, adjustable switching frequency up to 1MHz, fast current-mode control loop, and one or two output voltage setting. The output voltage can be programmed in 25mV steps over a range of 0.6 to 5V.

Features:

• Wide input voltage range from 6.5V to 55V
• Adjustable switching frequency up to 1MHz
• Fast current-mode control loop
• One or two output voltage settings
• 25mV steps over a range of 0.6 to 5V
• Integrated spread-spectrum clock output
• Integrated circuit protection functions

Applications:

The LTC3834EDHC-1#TRPBF is a versatile DC to DC switching controller that is suitable for a wide range of applications including power over Ethernet (PoE), DC/DC converters, ZVS/ZCS (Zero Voltage / Zero Current Switching) for low power SMPS, and many other applications that require excellent efficiency and low current losses. It can be used in a variety of topologies, including buck, boost, buck-boost, flyback, SEPIC and Cuk. It is also capable of operating in several different architectures, such as voltage mode and current mode. The wide input voltage range makes it suitable for use with a variety of power sources and the adjustable switching frequency allows for customizing the design to best meet the needs of the application.

Working Principle:

The LTC3834EDHC-1#TRPBF uses current-mode control technology to regulate the output voltage. It operates by comparing the sensed current to the internally generated bus voltage. When the sensed current is higher than the bus voltage, the controller will increase the switching frequency. Conversely, if the sensed current is lower than the bus voltage, the controller will decrease the switching frequency. This ensures that the output voltage is maintained within a specified range and is regulated to produce a steady and precise voltage. In addition, the spread-spectrum clock feature reduces EMI (electromagnetic interference) by providing a varying frequency signal within the allowed range.

The LTC3834EDHC-1#TRPBF offers programmable overcurrent protection and thermal shutdown. These features help protect the device from overstressing and provide diagnostic information in case of a failure. The controller also includes a front-end circuit to detect and filter out high-frequency transients or spikes, making it a suitable choice for applications in noisy or highly EMI environments.

The varied features and flexibility of the LTC3834EDHC-1#TRPBF make it an excellent choice for power management applications. Its wide input voltage range, adjustable switching frequency, and current-mode control technology enable the design of power solutions that are both efficient and precise.

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