LTC3127EDD#PBF

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LTC3127EDD#PBF Application Field and Working Principle

The LTC3127EDD#PBF is an ultralow power and high voltage buck-boost DC/DC converter from Linear Technology Corporation. This converter is a highly integrated, dual-output device, capable of operating over a wide input voltage range and supporting a variety of end-application voltages. The device is optimized for use in applications where battery life and small size are critical, including wearable and portable medical devices, industrial/automotive, and consumer applications.

Features and Benefits

The LTC3127EDD#PBF has several unique features which make it an attractive choice for many applications. It has a wide operating voltage range of 2.7V to 45V, enabling it to be used in a variety of applications. It also features a wide set of output voltages, adjustable from 0.6V to 42V, enabling it to be used in an even wider range of applications.

The converter also features an integrated synchronous buck-boost regulator, allowing it to operate in either buck or boost mode, depending on the input and required output voltages. It also has a low quiescent current of 3 μA, making it ideal for power-sensitive applications. It has a high efficiency of up to 95%, and a low noise, 0.3μVRMS output noise.

The device also has a low input voltage protection, over-temperature protection, a programmable current limit and soft-start feature. In addition, the device supports wide input range PWM control, enabling it to be used with a variety of PWM controllers.

Applications

The LTC3127EDD#PBF is suitable for a variety of applications, including: portable/wearable medical devices, DC/DC regulation for industrial/automotive, battery-powered LED lighting and wireless sensors, cellular handsets, laptops and notebooks, smart phones, PDAs, GPS modules, handheld meters and controllers, test equipment, and consumer applications.

Working Principle

The LTC3127EDD#PBF operates by combining a buck regulator and a boost regulator into a synchronous buck-boost DC/DC converter. The buck regulator steps down a high voltage input voltage to a lower regulated output voltage, while the boost regulator takes a low input voltage and boosts it to a higher regulated output voltage. The device works by first switching between buck and boost mode depending on the input and output voltages, and then regulating the output voltage by controlling the on-time of the synchronous switching MOSFETs. The output voltage is then stabilized by a voltage feedback loop.

The device also features integrated soft-start and current limit circuitry, providing increased protection and reliability. In addition, the device has a very wide input voltage range, enabling it to be used in applications with varying input voltages.

Conclusion

The LTC3127EDD#PBF is an ultralow power and high voltage buck-boost DC/DC converter from Linear Technology Corporation. It has a wide operating input voltage range, adjustable output voltages, low quiescent current, high efficiency, low noise, and several other features making it suitable for a variety of applications. It is optimized for use in applications where battery life and small size are critical, including wearable and portable medical devices, industrial/automotive, and consumer applications.

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