LT3511IMS#TRPBF

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PMIC - Voltage Regulators - DC DC Switching Regulators

LT3511IMS#TRPBF is a monolithic synchronous step-down DC-DC switching regulator with a wide input voltage range and high efficiency designed for automotive applications. It integrates two N-channel MOSFETs and two synchronous rectifier for low rDS(on) to reduce conduction losses that increase efficiency, as well as its constant frequency, cycle-by-cycle current limit and accurate output voltage regulation3 or 4.5V to 56V. The LT3511IMSTRPBF is capable to deliver transient output currents of up to 6A with 0.75A minimum steady state output current and 2A switch current limit. Also, it includes several features to ensure fault protection like UVLO, thermally enhanced shutdown protection and short-circuit protection.

Application Field

The LT3511IMS#TRPBF provides solutions for various automotive applications. These include automotive cameras, sensors, advanced driver assistance systems (ADAS), radar systems, heated rear windows, headlights, display systems, engine start, airbags, infotainment systems, and cluster systems. Its features and benefits make it suitable for a wide array of charging, regulating, and powering applications in cars. Its high switching performance enables low-noise power formats in multiple layer circuits without the need for an external booster and this makes it ideal for noise-sensitive applications.

Working principle

The LT3511IMS#TRPBF connects the input voltage to the output voltage via a switching cycle, and is programmed by an external frequency setting resistor. The input voltage is switched off asynchronously, and then the inductor stores the required input current. As soon as the output voltage has reached the required level, the output voltage is switched to the output voltage and the inductor flows the stored energy to the output. A synchronous rectifier is used at the output end of the switching cycle to prevent reverse current flow and ensure lowest possible losses.

The LT3511IMS#TRPBF integrates two N-channel MOSFETs and two synchronous rectifiers for low rDS(on) to reduce conduction losses and increase efficiency. The LT3511IMS#TRPBF also combines a constant frequency current limit control loop and accurate output voltage regulation for output voltage stability. This helps to provide a reliable power management solution for automotive applications.

In addition, the LT3511IMS#TRPBF includes several diagnostic and protection features to ensure fault protection. Undervoltage lockout (UVLO) prevents the part from running when the input voltage is too low, while the thermally enhanced shutdown protection activates on an over temperature condition. Other features such as short-circuit protection and optional overvoltage shutdown are also included.

In summary, the LT3511IMS#TRPBF is a reliable and powerful DC-DC switching regulator for automotive applications. With its wide input voltage range, high efficiency and large output current limit, it can provide stable power for a variety of automotive processes. Its various protection features and diagnostic features make it an ideal solution for sensitive and noise-sensitive projects.

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