LTC3891IUDC#PBF

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LTC3891IUDC#PBF

LTC3891IUDC#PBF application field and working principle belongs to the category of PMIC (Power Management Integrated Circuit), Voltage Regulators, and DC DC Switching Controllers. It is a High Density, DC/DC Synchronous Step-Down Controller/Switcher for Advanced Systems, with a maximum input voltage of 60V and a 6-A, 38V, synchronous, step-down regulator/switcher.

LTC3891IUDC#PBF contains advanced boundary-mode pulse-width modulation (PWM) control, featuring the ability to fixed frequency, high side/low side sensing, diff amp sensing and remote sense amplifiers to minimize output voltage deviation. It supports both current mode and voltage mode control, providing maximum efficiency and excellent AC/DC transient response. It also allows for adjustable pulse frequency, external synchronization, and frequency dithering to minimize output ripple.

Key Features

• Guaranteed Output Voltage Accuracy of 0.5%
• High Operating Frequency up to 1MHz
• Up to 6A Output Switch Current
• Current Mode and Voltage Mode Operation
• Adjustable Soft-Start and Ramp Rates
• Active Current Sharing for Parallel Operation.
• ±2% Accurate Internal Reference

Applications

• Linear Power Supplies
• Advanced Point of Load Regulation
• Industrial Power Supplies
• Current or Voltage Mode Control
• Monitoring, Control and Power Conversion
• Notebook and Server Power Supplies.

Working Principle

The LTC3891IUDC#PBF works by using a current- mode or voltage-mode control to regulate a switching regulator, providing efficient, fast transient response, and excellent differential voltage accuracy across a wide range of load currents. Its boundary-mode topology allows for wide-range light load efficiency, and its 6A switch current limit makes it suitable for powering demanding loads.

In current mode, the LTC3891IUDC#PBF delivers a regulated output voltage by comparing the output voltage to an internal voltage reference and modulating the upper and lower drive signals to the switch to maintain the desired output voltage. In voltage mode, the controller senses only the upper switch current and modulates the upper drive signal to regulate the output voltage.

The LTC3891IUDC#PBF also provides separate enable pins for both the high side and low side switch to control the rise and fall times of the switching transition. Other features include adjustable soft-start, active current sharing for parallel operation, frequency dithering to minimize output ripple and automatic transition from pre-bias startup to steady state operation.

Conclusion

The LTC3891IUDC#PBF is a high-density, synchronous, step-down regulator/switcher suitable for advanced systems with an operating input voltage range from 5V to 60V and an output voltage range from 0.8V to 38V. It features current mode and voltage mode operation, active current sharing, adjustable soft-start, and frequency dithering, enabling efficient and fast transient response with excellent differential voltage accuracy and light load efficiency.

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