LT3973EDD-3.3#PBF

PMIC - Voltage Regulators - DC DC Switching Regulators

The LT3973EDD-3.3#PBF is an application-specific DC/DC switching regulator. It is optimized for use with a wide range of external DC/DC buck and boost inductors, enabling designers to quickly and easily create robust and efficient power supply solutions. The LT3973EDD-3.3#PBF features a low-side power MOSFET with a maximum current rating of 4.0A, a power good indicator, an undervoltage lockout circuit, and a current-mode PWM control circuit.

Application Fields

The LT3973EDD-3.3#PBF is ideal for many portable and system-level applications, including tablets, laptops, and other consumer-electronic products. In addition, the LT3973EDD-3.3#PBF is suitable for design into power supplies, battery-charging systems, and automotive systems.

Working Principle

The LT3973EDD-3.3#PBF utilizes a fixed frequency, current-mode control architecture for precise, reliable operation. It includes two versatile inputs. The VDD input provides the main power for the controller, and the PWM input allows the user to control the regulation bandwidth, output voltage, and the maximum duty cycle.

The LT3973EDD-3.3#PBF includes a low-side power MOSFET with a maximum current rating of 4.0A, a power good indicator, an undervoltage lockout circuit, and a current-mode PWM control circuit. The low-side power MOSFET allows the user to switch high-current, step-down and step-up applications. The power good indicator monitors the status of the output voltage, while the undervoltage lockout ensures that the output voltage will not drop below a predetermined threshold. The current-mode PWM control provides excellent line and load regulation, cycle-by-cycle current limiting, and overcurrent protection.

In addition, the LT3973EDD-3.3#PBF includes thermal calibration, phase-locked loop (PLL) synchronization, and spread-spectrum frequency modulation (SSFM) for optimal EMI performance. The thermal calibration feature helps to maintain output regulation during extreme load, temperature, or input voltage changes. The PLL synchronization allows the LT3973EDD-3.3#PBF to synchronize with an external clock or other switching regulators for improved efficiency. The SSFM reduces the amount of RF noise generated during normal operation.

The LT3973EDD-3.3#PBF is an ideal solution for a variety of applications where precision, efficiency, and reliability are required. With its low-side power MOSFET, power good indicator, undervoltage lockout circuit, and current-mode PWM control, the LT3973EDD-3.3#PBF is a robust and efficient DC/DC switching regulator.