LTC3859AIFE

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The LTC3859AIFE is a PolyPhase, current mode DC/DC controller that is designed for applications that require low output noise, low minimum on-time and high efficiency over a wide input and output voltage range. It is suitable for both non-isolated and Isolated DC-DC converter applications, such as automotive and industrial supply voltage applications. It offers high efficiency at low Vin, low noise on-state operation and low EMI. The LTC3859AIFE is easy to use, with no external logic components to configure the controller, resulting in lower system overall cost.

Application Field of LTC3859AIFE

The LTC3859AIFE is a PolyPhase current mode controller specifically designed for automotive and industrial power systems and applications. It is particularly suitable for non-isolated/isolated applications that require low output noise over a wide input and output voltage range and require low minimum on-time. Applications are mainly divided into three types, such as buck, boost and isolated power supply.

• Buck application: The LTC3859AIFE can be used in a wide range of buck applications, such as high current DC-DC converter, single/multi-phase step down converter, and so on. The LTC3859AIFE provides high frequency operation and input voltage monitoring and over voltage protection, making it suitable for applications such as automotive power management modules, vehicle power supplies, and industrial or communication power supplies.
• Boost application: The LTC3859AIFE can be used in high current buck/boost applications where both the input voltage and output voltage vary over a wide range. With its high operating frequency, wide input and output voltage range, low noise and high efficiency, the LTC3859AIFE is suitable for dc-dc boost converter applications such as automotive power management module, power supply for electric vehicles and industrial/communication power supply.
• Isolated Power Supply: The LTC3859AIFE can be used for both non-isolated and isolated DC-DC applications. Isolated power supplies can be used for reliable applications such as electric vehicles and energy storage. The LTC3859AIFE makes it easier to design an isolated DC-DC converter by providing low on-resistance MOSFET drivers, monitoring of output voltage, high efficiency and superior transient response.

Working Principle

The LTC3859AIFE’s main principle of operation is to use its integrated high current MOSFETs to provide power conversion from one voltage level to another. Its core consists of a voltage feedback loop, current limit circuit and error amplifier, and a power MOSFET driver. The voltage feedback loop senses the output voltage of the converter and sends out error signals. The error signals will be amplified by an error amplifier and the amplified signal is passed to the current limit circuit. The current limit circuit then sends current signals to the PWM comparator and generates PWM outputs. The PWM outputs are then used to control the on/off interval of integrated buffering MOSFETs and regulate the output voltage.

The LTC3859AIFE is designed to provide superior fast transient response and maximum efficiency at low output voltages. The PolyPhase output is designed to minimize output ripple current and further improve efficiency by reducing the output capacitor size. The LTC3859AIFE also provides a soft-start feature to configure the output power-up waveform and a power-down waveform feature to reduce load transients. The integrated fault protection includes input over voltage protection, output over voltage protection, output current limit and over temperature protection.

Conclusion

The LTC3859AIFE is a PolyPhase, current mode DC/DC controller that is specifically designed for automotive and industrial power systems and applications. It offers low output noise, low minimum on-time and high efficiency across a wide input and output voltage range, making it an ideal solution for DC-DC conversion. The LTC3859AIFE provides high frequency operation and input voltage monitoring and over voltage protection, making it suitable for a wide range of applications.

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