LT8640EUDC-1#TRPBF

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The LT8640EU is a high power synchronous DC-DC converter with a step-down configuration optimized for automotive applications. A unique architecture combines high efficiency with compact size and flexible configurability. The LT8640EU is the first automotive DC-DC step-down converter in its class to offer 6A continuous current drive, while providing good efficiency over a wide output current range.

The LT8640EU utilizes a synchronous-rectifier buck architecture. It features two 1μF components on the input for soft-start and/or average current limiting. Two 5A/20V power switches are incorporated along with a current sense resistor and a voltage sense resistor. The LT8640EU produces adjustable output voltage from 1.0V to 28V. Output voltage accuracy is typically ±2% over-temperature and load with an exceptionally clean output.

The LT8640EU uses a 3A/32V external FET (or an integrated MOSFET for small packages and low power applications) for high efficiency operation. It has an internally adjustable preset frequency and dynamic VOUT range of 17V to 90V. Additionally, it includes internal over-temperature, over-current, and output under-voltage protection circuitry, enabling the LT8640EU to operate in a wide variety of automotive power applications.

The LT8640EU is offered in a wide range of packages including TDFN-10 (1.63mm x 2.65mm) and HTSSOP-16 (2.05mm x 4.90mm). The LT8640EU also features a power-good pin (PGOOD) to indicate output status. When the PGOOD pin is actively driven high, it indicates that the output voltage is within specified threshold limits and that the converter is operating within its specified current limits.

The LT8640EU offers numerous features to fulfill the needs of automotive applications. It has an 8-bit SPI interface for configurable control and monitoring, including over-temperature, over-current, and output under-voltage protection. The device also has adjustable soft-start, pre-bias startup, and dual-level current limit input ranges. Additionally, the device can be programmed for output voltage level and integrated slew rate control.

The LT8640EUDC-1#TRPBF is specifically engineered to guarantee an excellent frequency response while keeping a very low EMI level, making it applicable in high-performance automotive power applications. It also supports integrated current-mode control, clock synchronization in dropout, and phase-shift synchronization for high frequency multiphase operations. This flexibility provides the design engineer with the ability to optimize the specific demands of the application.

In summary, the LT8640EUDC-1#TRPBF is a high power, synchronous step-down DC-DC converter that is optimized for automotive applications. Its unique architecture provides excellent efficiency, compact size and configurability. It is offered in a wide range of packages and features a wide input and output voltage range, SPI interface, over-temperature and over-current protection, adjustable soft-start, pre-bias startup, dual-level current limit input ranges, high frequency switching support, integrated current-mode control, clock synchronization in dropout, and phase-shift synchronization features.

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