UCC2805NG4

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The UCC2805NG4 is a DC-DC switching controller of Texas Instruments that has a wide range of applications. The product addresses the needs of energy management and power supply regulation, with specialized tools and features that allow engineers to create and optimize designs for power conversion applications.The UCC2805NG4 is a step-down and step-up, DC-DC switching controller with an integrated high-side MOSFET and low-side MOSFET, offering adjustable current-limiting, under-voltage lockout, over-voltage protection, thermal shutdown and soft-start capability. The switching controller provides an efficient and safe solution for multiple applications where a multi-rail DC-DC regulation design is required.The UCC2805NG4 is fast and easy to apply in a variety of manual and automated systems. It is designed to reduce power loss and maximize efficient operation, combining with two external MOSFETs to form a synchronous buck or boost converter. Its configuration is easy, with a simple architecture enabled by an on-board configuration jumper that allows for the selection of either a step-up or step-down converter.The key features of the UCC2805NG4 include a wide 4.5V to 60V input voltage range, 1.2A peak current limit, adjustable output voltage from 0.45V to 13V, fast 1-KHz frequency, adjustable soft-start and load transient performance, and reset and enable pins. The integrated current-mode control loop provides line and load regulation accuracy, minimizing control loop adjustments, while external synchronization capability allows for input frequency up to 2 MHz, making it one of the best choices for high-performance applications.The process of voltage conversion is performed in a synchronous buck converter via Pulse Width Modulation (PWM). The controller has a fixed clock frequency of 1 kHz, which is adjustable using an external resistor; the duty cycle can be adjusted using the voltage feedback signal provided to the DC-DC controller by a resistor divider.When the input voltage is higher than the desired output voltage, the synchronous buck converter operates in step-down mode. The external switches, one connected to the high side output of the controller and the other to the ground, switch at the predetermined frequency and enable the current to flow in two directions. The voltage output of the converter is proportional to the duty cycle of the two external switches, which is controlled by the DC controller in response to the feedback signals from the resistive divider.When the input voltage is lower than the desired output voltage, the synchronous buck converter operates in step-up mode. The external switches of the DC controller switch at the predetermined frequency, this time enabling the current to flow in one direction only. The voltage gain of the converter is proportional to the duty cycle of the external switch, that is also controlled by the DC controller.The UCC2805NG4 is a versatile switching controller, making it suitable for multiple applications such as point-of-load converters, solid-state drives, motor drives, buck boost converters, power supplies, and general-purpose voltage regulators. It is an ideal choice for those who require a device that can simultaneously step-up, or step-down, the input voltage to create a wide range of output voltages. Additionally, the device integrates advanced features, such as adjustable current-limiting, overtemperature protection, adjustable soft-start, and reset and enable pins to ensure a safety and reliable operation for multiple applications.

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