LT8641EUDC#PBF

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Overview

The LT8641EUDC#PBF is a fixed frequency synchronous step-down switching regulator with integrated high-side and low-side switches. It can deliver up to 2.3A continuous output current over a 0.7V to 3.3V output voltage range. The device features a highly integrated and efficient power conversion solution that eliminates the need for external compensation and allows quick design cycle and time-to-market. The LT8641EUDC#PBF is part of the Linear Technology’s Power System Design Center™, which includes a wide range of power system design tools; including Power System Simulink models, user-guide, datasheets and application notes.

Application Fields

Wireless Power: The LT8641EUDC#PBF can be used in various wireless power applications. The device operates with an excellent efficiency at low output current and can provide a higher output current at a reduced efficiency. This makes it ideal for wireless power applications such as portable, low-profile wireless chargers, wireless speaker systems, wireless handsets and wireless headsets.

Automotive: The LT8641EUDC#PBF is designed to meet the challenging requirements of automotive applications. It offers very low quiescent current and ultra-low noise operation, allowing for lower power consumption and improved audio performance in automotive audio applications.

Industrial: The LT8641EUDC#PBF suits many industrial applications requiring a fast-transient and reliable power supply. The device features an ultra-low power shutdown mode that can be used to minimize the power consumption in standby and no-load applications.

Working Principle

The LT8641EUDC#PBF is a fixed frequency synchronous step-down switching regulator with integrated high-side and low-side switches. It combines a high-side MOSFET, a low-side MOSFET, an on-board inductor, current-limit and thermal-shutdown circuits into a single, low-profile package. The LT8641EUDC#PBF operates in two modes – Continuous Conduction Mode (CCM) and Discontinuous Mode (DCM).

In CCM, the MOSFETs in the switching regulator continuously conduct current during their active duty cycle. This mode of operation ensures the highest efficiency of the device, as well as the most reliable operation at high frequencies. In DCM, the inductor current falls to zero during the inactive portion of the MOSFET duty cycle. This mode of operation is more efficient than CCM, but requires careful selection of the inductor and capacitors in order to ensure reliable operation.

The LT8641EUDC#PBF can be programmed with a single resistor to set the switching frequency up to 500kHz. Additionally, the device can be easily synchronized to an external clock to provide better noise immunity and reduce EMI levels. The device features an output disconnect feature that, when enabled, shorts the output to ground and the internal MOSFETs are disabled. This feature is extremely useful in applications where an instantaneous disconnect is needed.

Conclusion

As a fixed frequency synchronous step-down switching regulator with integrated high-side and low-side switches, the LT8641EUDC#PBF provides a high degree of integration, improved efficiency and reduced complexity in a wide variety of applications, including wireless power, automotive and industrial. The device operates in two modes – Continuous Conduction Mode (CCM) and Discontinuous Mode (DCM) – and is easily programmable with a single resistor to set the switching frequency upwards of 500kHz. With its highly efficient operation and robust feature set, the LT8641EUDC#PBF can serve as an ideal solution for a wide range of power systems applications.

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