LTC3862IGN-2

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The LTC3862IGN-2 is a high-performance, high-accuracy, quad-phase synchronous buck controller optimized for the smallest solution size in high-current, intermediate bus DC/DC converter applications. The device allows current-mode control over the entire range of line and load input to output variation and in conjunction with its error amplifier, provides extremely precise current and voltage regulation. Utilizing unique valley current mode techniques, the device maintains low ripple and dynamic transient response. The device minimizes required loop compensation elements and enables the current mode design approach with unprecedented transient flexibility.

Application Fields

The LTC3862IGN-2 is a high-performance, quad-phase synchronous buck controller intended for use in small size DC/DC converter applications. This device is capable of driving four buck channel circuit stages to achieve an intermediate bus voltage (i.e., between 0.6 V and 3.3V). Ideal applications for this product include power supplies for graphics cards, NIC cards, and CD/DVD players. It is also suitable for communications equipment and consumer electronics.

Working Principle

The LTC3862IGN-2 operates in current-mode control, meaning it senses the current on its output and controls the voltage to the load so that the preset current is maintained. The controller achieves this by employing unique valley current mode techniques and by minimizing the required loop compensation elements, enabling the current-mode design approach with unprecedented transient flexibility. The device also includes an error amplifier which provides a regulated voltage output, enabling both further current and voltage regulation.

The LTC3862IGN-2 incorporates a quad-phase circuit structure to accurately control four separate buck channels. This structure reduces the input ripple in the channels, which decreases the current required for accurate regulation of the output voltage. The quad-phase structure also increases the efficiency of the converter, through reduced switching losses, making it an ideal choice for low power supplies.

In addition, the LTC3862IGN-2 features a Temperature Monitor in order to determine the junction temperature of its on-board MOSFETs. This feature helps to ensure that the device is operating within its specified temperature range and avoids any thermal overloads.

The LTC3862IGN-2 is also configured with an Analog-to-Digital Converter (ADC). This feature allows the controller to accurately measure the output voltage and the input voltage. It is also able to measure the FET temperatures, which can be used to adjust the power output accordingly.

Overall, the LTC3862IGN-2 is a powerful quad-phase synchronous DC/DC converter solution. Its current-mode control, valley current-mode techniques, remote sensing and temperature monitoring, make it an outstanding choice for high-performance applications.

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