LTC3855IFE#TRPBF

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The LTC3855IFE#TRPBF is a member of the family of DC-DC switching controllers from Linear Technology Corporation. It is specifically designed for applications requiring regulated power conversion, such as SEPIC (Single-Ended Primary-Inductor Converter), Cuk (Constant On-time Buck/Boost), Buck, Boost and/or Inverting topologies. This device comes embedded with a low dropout, wide input voltage range, a current mode controller and a 500 kHz internal oscillator, making it a very efficient solution for non-isolated DC-DC switching applications with tight regulation and low noise.

Application Field

The LTC3855IFE#TRPBF device is specifically designed to be an integrated solution for a wide variety of non-isolated DC-DC switching applications, including but not limited to AC/DC adapters, PCMCIA (Personal Computer Memory Card International Association) cards, wireless handsets, routers, switches, dc/dc supplies, automotive electronics and more. It is a great choice for designs with small form factors, efficiency requirements, specific costs and/or large current configurations. Additionally, the LTC3855IFE#TRPBF comes with various features, such as input voltage under-voltage lockout, frequency foldback and/or programmable switching frequency, which enable the designer to customize and fine-tune their power conversion design.

Working Principle

With its built-in charge-pump low dropout linear regulator, the LTC3855IFE#TRPBF automatically provides the necessary voltages to power its internal oscillator. This oscillator is used to produce the switching frequency that in turn controls the MOSFET switch. The oscillator is isolated from the input voltage by isolating the error amplifier from the input voltage. This method enables the designer to more accurately program the current limit of the device by adjusting the oscillator frequency, thus providing for a more efficient and reliable solution. The device is also able to perform pre-biasing to reduce the current surge when the input voltage is dropped, even at very low levels. Additionally, the device can detect a short-circuit on the output and respond by either disconnecting the MOSFET transistor (latching shut-down) or reducing the current limit (non-latching shut-down).

The LTC3855IFE#TRPBF also features a dual loop system where the inner loop is used to regulate the output voltage and the outer loop maintains the current with a constant slope. This two-loop system provides a very stable control with reduced ripple and noise, and is capable of achieving high efficiency. Furthermore, this device also allows the design to adjust the peak-current limit while using the same compensation components, effectively reducing the total amount of board space and cost, allowing for a more efficient power conversion design.

Ultimately, the LTC3855IFE#TRPBF provides an all-in-one solution for DC-DC switching applications and is a great choice for projects that need high efficiency, tight regulation and/or low noise. It also offers numerous features, such as frequency foldback, low voltage pre-biasing, dual loop control and more, enabling the designer to customize their power design in order to achieve their desired performance.

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