LTC7801IUFD#TRPBF

PMIC - Voltage Regulators - DC DC Switching Controllers: The LTC7801IUFD#TRPBF

The LTC7801IUFD#TRPBF is a fully-featured DC/DC step-down switching controller IC from Linear Technology Corporation. It is a multi-function, high-performance IC that can be used in a variety of applications to provide better voltage regulation, lower switching ripple, and improved power efficiency. This article will examine the application field and working principle of this powerful IC.

Application Field

The LTC7801IUFD#TRPBF is designed for a variety of high-power DC/DC applications including point-of-load converters, DC/DC bus converters and modular DC/DC converters. It is suitable for low-cost applications that require high-performance power regulation and fast dynamic response. This device can be used in a variety of applications, including PC motherboards and peripherals, laptop and notebook power systems, gaming consoles, and other smart-power and portable applications.

Working Principle

The LTC7801IUFD#TRPBF works by controlling external power transistors, allowing them to switch efficiently between high or low impedance states. In this device, the sense resistor is used to detect the voltage and current changes and provide feedback to the IC. The IC has logic-level inputs for soft-start, enabling, and other control signals, as well as for monitoring the output voltage.

The IC operates in two modes: Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM). In CCM, the current in the power inductor is continuous, preserving efficient operation. In DCM, the current is discontinuous, allowing for lower output ripple voltages and lower power losses. The IC cycles between these two modes to maintain efficient operation for different load conditions.

The LTC7801IUFD#TRPBF\'s output voltage is programmed with an external resistor divider connection. The IC also has adjustable output overvoltage protection, overcurrent protection, thermal shutdown protection, and soft-start. The IC can be soft-started through external control pins, or optionally via a built-in ramp current source or an external capacitor.

Conclusion

The LTC7801IUFD#TRPBF is a high-performance DC/DC step-down switching controller IC that can be used in a variety of applications, including point-of-load converters, DC/DC bus converters, and modular DC/DC converters. It works by controlling external power transistors to switch between high and low impedance states, and cycles between two modes: Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM). The device has adjustable output overvoltage protection, overcurrent protection, thermal shutdown protection, and soft-start. The output voltage is programmed with an external resistor divider connection. Overall, the LTC7801IUFD#TRPBF is a reliable and efficient IC for a wide range of applications.