LT3430EFE#TRPBF

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Introduction

The LT3430EFE#TRPBF is a DC/DC switch regulator designed for high power, low noise and low-side current sensing applications. It integrates an external P-channel MOSFET for simplified power architecture and uses the latest design techniques to achieve the highest power density, and highest efficiency with the lowest possible solution cost. The LT3430EFE#TRPBF is part of the high-performance family of DC/DC switch regulators from LT.

Application Field

Due to its high power density and high efficiency, it is widely used in automotive, industrial, and consumer products. The LT3430EFE#TRPBF is ideal for applications such as high power LEDs, mobile device charging, automotive, on-board networking, and other point-of-load applications where power conversion is required.

Working Principle

The LT3430EFE#TRPBF uses a synchronous buck regulator scheme, in which the output voltage is regulated through the inductor current reversal. The output voltage is regulated by controlling the total on-time of the P-channel MOSFET. It consists of an internal voltage comparator for the internal voltage loop, making it possible to operate in either fixed frequency or variable frequency. The LT3430EFE#TRPBF also features an integrated Class-D amplifier to improve the transient responses and reduce the area required near the main controller.

The LT3430EFE#TRPBF includes an integrated MOSFET which is activated by the main controller’s gate signal. The MOSFET is connected in reverse cascade configuration, with its drain connected to the input voltage and its source connected to the inductor. Due to the internal circuitry, the on-time of the MOSFET is automatically adjusted according to the load and input voltage conditions, allowing for optimal P-channel MOSFET utilization.

By including an integrated low-side current sense MOSFET, the LT3430EFE#TRPBF can accurately monitor the output current and regulate the output voltage accordingly. It also features a wide range of output voltage and current protection features, such as input under-voltage lock out, output over current protection and short-circuit protection.

Conclusion

To summarize, the LT3430EFE#TRPBF is a high-performance DC/DC switch regulator designed for high power, low noise and low-side current sensing applications. It utilizes the latest design techniques to achieve the highest power density and highest efficiency with the lowest solution cost. Performance features include input under-voltage lock out, output over current protection and short-circuit protection. It is a reliable and cost-effective choice for automotive, industrial, and consumer product applications.

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