LTC3521IUF#PBF

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The LTC3521IUF#PBF is a dual two-phase, synchronous step-down DC DC switching regulator controller with integrated high-side and low-side MOSFETs and inductor drivers. This device integrates two independent synchronous step-down regulators with 0.8V tracking into a single 10-pin DFN package. The LTC3521IUF#PBF supports a wide input voltage range from 3.2 V to 16 V and provides an adjustable regulated output voltage of 0.8 V to 5V. Both controllers have output current ratings of up to 4A. This highly efficient and compact device is an ideal choice for today’s portable electronic applications such as cell phones, notebook computers, and portable MP3 players.

Application Fields

The LTC3521IUF#PBF provides dual two-phase step-down regulation, making it ideal for use in a wide range of portable, hand-held, and battery powered applications. Its dual two-phase conversion increases transient response capability and eliminates the need for large output capacitors and films. The low-quiescent current and high efficiency of the LTC3521IUF#PBF also make it suitable for use in low-power green applications. Its 4-A current capability and 0.8-V tracking allows it to regulate high current and/or low-voltage load currents. The LTC3521IUF#PBF is also well suited to systems that draw power from a variety of sources, such as a battery, AC adapter, and USB.

Working Principle

The LTC3521IUF#PBF is a dual two-phase synchronous step-down DC DC switching regulator controller with integrated high-side and low-side MOSFETs and inductor drivers. The working principle of this device consists of two synchronous step-down converters working independently to generate two outputs from one input. The device has a dual phase control that provides double the output current of a single converter in the same 10-pin DFN package, thereby reducing the total board area required for implementation. The LTC3521IUF#PBF supports a wide input voltage range from 3.2 V to 16 V and provides an adjustable regulated output voltage of 0.8 V to 5V. The independent two-phase operation of the two controllers provides excellent transient response at the output, allowing for lower output capacitance and increasing efficiency. The integrated high-side and low-side MOSFETs in the equivalent of a single package also reduce the number of external components, reducing overall system cost. Finally, its low quiescent current and standby power also make it an ideal choice for green applications.

Conclusion

The LTC3521IUF#PBF is a highly efficient and compact dual two-phase synchronous step-down DC DC switching regulator controller with integrated high-side and low-side MOSFETs and inductor drivers. This device is ideal for portable and battery powered applications, as well as green applications. It is also well suited to systems that draw power from a variety of sources. The LTC3521IUF#PBF provides excellent transient response at the output, reduces the total board area required for implementation, and minimizes external component count enabling cost effective design.

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