LTC7810HLXE#PBF

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The LTC®7810HLX DC-DC switching controller is a high-performance step-down DC/DC switching controller from the Power Management Integrated Circuit (PMIC) voltage regulator family. It provides power conversion between an input voltage of up to 42V and a regulated 5V output. The device features a high-efficiency, low noise, and fast dynamic response control loop designed for use in synchronous buck DC/DC converters. It is capable of delivering a continuous output current of up to 18A and a maximum output power of 85W. Additionally, the LTC7810HLX has a low noise, no-load standby mode, which helps reduce power consumption.

The LTC7810HLX includes an adaptive on-time control phase-locked loop (PLL) architecture and high-resolution voltage control loop to provide superior load regulation, fast transient response, and high conversion efficiency over a wide range of input voltages and load conditions. Its user-programmable features make it ideal for applications in computing, networking, and communications, as well as automotive and industrial systems. The device operates from either a PWM or an external clock source, and includes optional output voltage sequencing and tracking, allowing multiple outputs to be ramped up or down in a given order.

Power Stage

The LTC7810HLX features an advanced high-speed, low-side MOSFET driver. This driver supports a wide range of FETs with a minimum input voltage of 5V, a peak input of 7V, and is capable of sourcing a 35A peak and 30A continuous gate drive current. With the integrated adaptive gate turn-off capability, the MOSFET driver prevents shoot-through error due to transients, reduces parts count, and minimizes external components for improved system efficiency. Additionally, the power stage of the LTC7810HLX can be scaled and paralleled to increase the output current and power capability.

Internal Protection Features

The device includes several built-in protection features to ensure system reliability, including overvoltage, undervoltage, overcurrent, and thermal protection. Overvoltage protection is assured with the output voltage and current limit pins, which can be set to the desired value up to the maximum effective switching frequency. Undervoltage protection is provided by the device keeping the output voltage at proper set levels, as it can switch off the FET when the input voltage drops below the undervoltage level. The thermal protection facilitates safe operation of the device and prevents damage due to excessive temperature. Lastly, overcurrent protection helps improve system reliability by limiting the peak current, ensuring that the current does not exceed the maximum safe levels.

Conclusion

The LTC7810HLX is an ideal solution for high-performance, wide Vin, DC/DC switching controller applications. Its power conversion capabilities, combined with its high-efficiency, fast dynamic response, and exceptional load regulation, make it a perfect fit for computing, automotive, and industrial applications. Moreover, its user-programmable features, such as adaptive on-time, output voltage sequencing, and thermal and overcurrent protection, make it the preferred choice for designers looking to reduce system cost, conserve board space, and improve system reliability.

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