PT3343C

DC DC Converters

DC/DC converters use a regulated electrical process to convert a source of direct current (DC) from one voltage level to another. This process is often used for stepping down from a larger DC source to a small battery, as well as to achieve higher levels of voltage regulation than can be obtained directly from the power source. The PT3343C is a three-phase synchronous buck converter with an integrated startup amplifier. It is designed for use in small to medium power applications and features an adjustable operating frequency, programmable soft-start, and a minimum operating voltage of 3.3V.

Application Field

The PT3343C can find a wide array of applications in various industrial and consumer products. It is suitable for applications that require high performance, low noise, and high efficiency including, but not limited to, imaging systems, automotive, low-voltage LED drivers, and point of load regulators. Additionally, it can be used in situations in which a DC to DC converter is required to deliver high power levels.

Working Principle

The PT3343C utilizes a three-phase step-down synchronous buck topology. This topology is a combination of three phases, each formed by a pair of high- and low-side independent FETs, as well as gate drivers and a current-mode controller. The high- and low-side FETs act as switches and allow the converter to switch on and off rapidly, allowing for a wide range of output potentials. The FETs also provide a pulse-width modulation (PWM) signal to control the voltage levels of the output. The current-mode controller regulates the output voltage by sensing the current in the power path and adjusting the PWM signals accordingly.

The PT3343C also includes an integrated startup amplifier that provides an adjustable programming signal. This signal is used to control the current through the external resistors and is used to regulate the startup and steady-state conditions of the converter. The current-mode controller adjusts the PWM signals to maintain a desired voltage level and ensure reliability of the device.

Conclusion

The PT3343C is a three-phase synchronous buck converter with an integrated startup amplifier. It is designed for use in small to medium power applications and features an adjustable operating frequency, programmable soft-start, and a minimum operating voltage of 3.3V. Its application field includes, but is not limited to, imaging systems, automotive, low-voltage LED drivers, and point of load regulators. It utilizes a three-phase step-down synchronous buck topology combined with a current-mode controller, and features an integrated startup amplifier for regulating the startup and steady-state conditions of the converter.