LT3667IUDD#PBF

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The LT3667IUDD#PBF is a 2 mA to 2 A adjustable step-down switching regulator and linear regulator combination for high power applications. It has a wide input voltage range from 0.5 V to 5.5 V, and is capable of providing a regulated output from 0.9 V to the input voltage. The LT3667IUDD#PBF provides a powerful combination of features to help designers achieve high efficiency and performance with fewer total components.

Application Field

The LT3667IUDD#PBF can be used in a wide range of applications, including portable electronics, wireless communications, I/O isolation and power management, desktop and server computers, and automotive systems. It can be used to power everything from small microcontrollers to large FPGAs. It’s also suitable for supplying essential system power rails or powering a single high-current output. The LT3667IUDD#PBF delivers stable and efficient operation at up to 95% efficiency in both linear and switching modes.

Working Principle

The LT3667IUDD#PBF operates on a Buck topology and incorporates a programmable output voltage control loop and an analog–programmable peak current control loop. The output voltage can be set accurately between 0.9V and 5.5V by an external voltage divider. The external voltage divider is also used to monitor the output voltage. The current limit setting can be programmed by selecting the appropriate resistor (RSET) value. The upper limit of the current limit is determined by the sense resistor value, which means that the maximum current can be adjusted over a wide range of output currents.

The LT3667IUDD#PBF also incorporates a power-saving low-noise linear regulator. The linear regulator provides excellent low noise performance at light load conditions by delivering the required output voltage without switching. The converter enters sleep mode when the output voltage goes below 1V, which reduces the standby current to a few µA. This feature can be enabled or disabled by a logic signal.

In summary, the LT3667IUDD#PBF is an efficient and cost-effective solution for power supply and power management applications with wide input voltage range, adjustable output voltage, and adjustable current limit. Furthermore, the low-noise and power-saving linear regulator make it an excellent choice for FPGA and consumer applications as well.

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