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LT8330EDDB#TRPBF Application Field and Working Principle

The LT8330EDDB#TRPBF is a 35V synchronous dual-phase buck dc-dc regulator. It is a feature-rich solution for powering processor cores and other high-current loads from 7V to 35V inputs. The device integrates two 700mA/1.4A switch controllers and a 4A high-side power MOSFET. The device is designed for easy use with a PWM and offers fast transient response. The device uses quiescent current of less than 750μA typical and is available in a 10-lead MSOP and 14-lead TSSOP package. The LT8330EDDB#TRPBF is an ideal choice for powering processor cores and other high-current loads for all types of applications.

Application Field

The LT8330EDDB#TRPBF is suitable for applications such as notebook computers, tablet PCs, server power supplies, telecom power supplies, automotive power supplies, and other high-current loads. It can be used as a step-down regulator, providing a regulated output voltage up to 1.8V at 1.4A or 700mA. The device also supports adaptive voltage positioning (AVP) architecture to further optimize efficiency while providing fast transient response.

Working principle

The LT8330EDDB#TRPBF operates by connecting the switching controllers to external power MOSFETs to form a dual-phase buck regulator. The two differential PWM inputs control the switching of the phases. The average current of each phase is sensed and available through C SP connector. This signal is then used to synchronize the two phases and minimize the input current ripple. The AVP signal is also connected to C SP connector and can be adjusted to optimize the output voltage regulation. The internal switches of the LT8330EDDB#TRPBF drive the external switch MOSFETs with precise gate drive and timing. The first switch of each phase remains in on state until the current of the phase times out or the second switch of the phase turns off. The synchronous rectification is available when LT8330EDDB#TRPBF is used in step-down conversion. By connecting a PMOS to the drain of the high-side switch and controlling it with the PWM1, synchronous rectification is enabled and asynchronous rectification is disabled.

Conclusion

The LT8330EDDB#TRPBF is a 35V synchronous dual-phase buck dc-dc regulator suitable for applications such as notebook computers, tablet PCs, server power supplies, telecom power supplies, automotive power supplies, and other high-current loads. It provides fast transient response with low quiescent current, easily achieved with its PWM inputs and AVP architecture.

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