LT3430IFE-1#TRPBF

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LT3430IFE-1#TRPBF Application Field and Working Principle

Introduction

The LT3430IFE-1#TRPBF is a switched capacitor voltage regulator with internal feedback. It uses a fully integrated stacked capacitor converter to deliver up to 500mA output current over a wide input voltage range of 3V to 6V. The voltage regulator operates at a switching frequency of 2MHz and has an adjustable switching transition region width. It is designed to provide 0.5% output accuracy over a wide load and temperature range. The LT3430IFE-1#TRPBF is ideal for use in Point-of-Load (PoL) applications where high current density power supplies are required.

Application Field

The LT3430IFE-1#TRPBF is well suited for applications such as Point-of-Load(PoL) DC/DC boost converters, PoL power supplies, field programmable gate arrays (FPGAs), digital signal processors (DSPs), system on chips (SoCs), analog-to-digital converters (ADCs), and regulators control and management. The device is also ideal for automotive designs and other low voltage, high current applications.

Working Principle

The integrated circuit contains two identical DC-DC buck converter sub-circuits. Each sub-circuit consists of input and output inductors, a current sense amplifier, a low-RDSON power MOSFET switch, and an integrated feedback loop controller. The switch turns on during the input voltage transition and turns off during the output voltage transition. The current sense amplifier senses the instantaneous switching current through the inductor, thereby limiting the peak inductor current. The feedback loop closes the loop and ensures that the output voltage is accurate over the range of input and output voltages.

The LT3430IFE-1#TRPBF also integrates an adjustable peak current limit circuit, which prevents output over-current conditions. The peak current limit circuit is adjustable via an external resistor connected at the current sense pin. This peak current limit circuit provides excellent protection against output over-current conditions.

The integrated stacked capacitor converter operating in quasi-square wave mode improves the switch transition region width and minimizes the output ripple. The switching frequency is also adjustable and can be set to as low as 200kHz to further minimize the output noise. The quasi-square-wave configuration eliminates the dV/dt ringing during switch transitions, which reduces the electromagnetic interference (EMI) problem associated with ordinary buck converters.

Conclusion

The LT3430IFE-1#TRPBF is a DC-DC buck converter with integrated feedback and a wide input voltage range. It is well suited for applications such as PoL DC/DC boost converters, PoL power supplies, and other low voltage, high current applications. The device also incorporates an adjustable peak current limit circuit, which prevents output over-current conditions. The integrated stacked capacitor converter operating in quasi-square wave mode improves the switch transition region width and minimizes the output ripple. The integrated feedback loop ensures accurate output voltage and the adjustable switching frequency allows for further reduction in output noise.

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