LTC3859ALIUHF#TRPBF

Frequency - Switching:	115kHz ~ 835kHz, 350kHz ~ 535kHz
Base Part Number:	LTC3859
Supplier Device Package:	38-QFN (5x7)
Package / Case:	38-WFQFN Exposed Pad
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Enable, Frequency Control, Power Good, Soft Start, Tracking
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	99%, 100%
Series:	--
Voltage - Supply (Vcc/Vdd):	4.5 V ~ 38 V
Output Phases:	2
Number of Outputs:	3
Topology:	Buck, Buck-Boost, SEPIC
Output Configuration:	Positive
Function:	Step-Down, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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.Application Field and Working Principle of LTC3859ALIUHF#TRPBF

LTC3859ALIUHF#TRPBF is a high-performance synchronous step-down switching controller. It is part of the PMIC (Power Management IC) family and belongs to the Voltage Regulators category, specifically the DC/DC Switcher Controllers. The purpose of this device is to offer designers a complete solution for reducing a voltage from a high input source to a lower one with efficiency and accuracy. This cost-effective solution will allow for smooth and quiet operation due to the high switching frequency and low inductance opportunities, as well as reduced external components and power supply design.Feature Summary

The LTC3859ALIUHF#TRPBF\'s feature set includes an adjustable output voltage of 1.0V to 6.0V, wide input voltage range of 3.2V to 6.6V, constant frequency peak current mode control, enhanced loop stability, integrated synchronous rectified FET gate drivers, as well as programmable soft-start and current limit. The device is also UL listed, offering designers peace of mind for their power supply design.Functionality and Operation

The LTC3859ALIUHF#TRPBF operates off an external synchronous rectifying switch and rectified input voltage, allowing it to control the output voltage at a fixed fraction of the input voltage. A current limit, set by an optional external resistor, provides robust protection against overload and short-circuit conditions.A feedback input monitors the output voltage. As the output voltage deviates from the desired set point, the internal error amplifier will adjust the PWM duty cycle to correct it. The device also contains an internal cycle-by-cycle over-current protection circuit and programmable soft-start feature.Advanced Features and Benefits

The LTC3859ALIUHF#TRPBF offers several advanced features that give designers and engineers more control over their power supply designs.One of these advanced features is the 2-cycle burst mode, which allows for smooth and quiet operation by relying on low inductance opportunities. This feature greatly helps to reduce output ripple and improve efficiency. Other advanced features include programmable cycle-by-cycle current limit, input voltage feed-forward control, internal switching frequency control, and programmable soft-start.The LTC3859ALIUHF#TRPBF also provides design convenience due to its low operating voltage and wide input voltage range. Additionally, its standby current draw is very low, making it ideal for applications that require low idle current consumption.Conclusion

In conclusion, the LTC3859ALIUHF#TRPBF is a cost-effective solution for designers who need a reliable and accurate power supply design. By relying on a number of advanced features and benefits, it allows for smooth and quiet operation of the system, while its low operating voltage, wide input voltage range, and low idle current make it ideal for applications that require low current consumption. With its synchronous rectified FET gate drivers, enhanced loop stability, and programmable soft-start and current limit restrictions, it is a complete solution for reducing a voltage from a high input source to a lower one with efficiency and accuracy.

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