LT3758AEMSE#PBF

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LT3758AEMSE#PBF is an advanced DC-DC switching controller which is designed to provide cost-effective solutions for producing highly efficient, switched-mode power supplies. It employs synchronous rectification to minimize power conversion losses that can be accessed via the standard 2mm × 2mm QFN package. The package supports greater than 10mm creepage and clearance for medical applications, as well as basic overvoltage and undervoltage protection features.

Application Field

LT3758AEMSE#PBFDC-DC switching controllers are commonly used in consumer and flat panel displays, cellular phones, high-end computing systems, solar power systems, automotive applications and medical applications.They provide the highest level of efficiency, controllability, reliability and flexibility for all types of power conversion needs.

Working Principle

The LT3758AEMSE#PBF DC-DC switching controllers are designed to operate in fixed-frequency step-down (buck) and step-up (boost) configurations. The device uses synchronous rectification which reduces power consumption compared to conventional MOSFET rectification. When a fixed-frequency buck regulator is operating in “continuous conduction mode”, the current flowing through the inductor and the FETs combines in a continuous wave form and is controlled by a pulse width modulated (PWM) signal. As the maximum duty cycle approaches 100%, the current levels in both inductor and MOSFETs decreases and the device enters “forced discontinuous conduction mode”. In this mode, the current abruptly stops as the duty cycle reaches 100%, followed by a brief low level excursion before the beginning of the next repetitive cycle.

The LT3758AEMSE#PBF DC-DC switching controller provides an accurate and precise current limitation setting that is adjustable via a sense resistor. In addition, if the sense resistor fails, the device can operate in digital current limit mode. The device also features over-temperature protection, fault and soft-start features, programmable switching frequency and power good phases, as well as programmable loop compensation and soft-start sequencing.

Conclusion

The LT3758AEMSE#PBF DC-DC switching controller is a highly advanced, efficient and cost effective DC-DC switching solution designed to minimize power conversion losses in portable applications, automotive and medical designs. It provides high accuracy current limit, over-temperature protection, fault protection, switching frequency, power good and soft-start features, as well as programmable loop compensation and soft-start sequencing.

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