LT3782AIUFD#PBF

Frequency - Switching:	154kHz ~ 465kHz
Base Part Number:	LT3782
Supplier Device Package:	28-QFN (4x5)
Package / Case:	28-WFQFN Exposed Pad
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Enable, Frequency Control, Reset, Soft Start
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	Yes
Duty Cycle (Max):	94%
Series:	--
Voltage - Supply (Vcc/Vdd):	6 V ~ 40 V
Output Phases:	2
Number of Outputs:	2
Topology:	Boost
Output Configuration:	Positive
Function:	Step-Up
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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LT3782AIUFD#PBF is a low quiescent current, two-channel buck/boost switching controller. It receives an input voltage and drives two independent internal P-channel MOSFETs to produce an adjustable output voltage from 3.3 V up to 28 V with up to 90% efficiency.The LT3782AIUFD#PBF is an ideal solution for applications requiring an adjustable output voltage, such as power adapters and automotive power supplies. It can also be used to drive two outputs independently for applications such as multiphase blinky circuits, multiple boost converters, power inverters and programmable regulators.

Features

The LT3782AIUFD#PBF is controlled by an internal current mode control loop. It features ultra-fast load step response and low noise operation, making it suitable for high performance applications. It also has a programmable undervoltage lockout threshold, ramp rate and slew rate reduction.Other features include adjustable frequency and duty cycle, overvoltage protection, fold back current limit and thermal shutdown. It can also be programmed to shut down or enter a low current state in the event of an error condition.

Application Fields

The LT3782AIUFD#PBF is designed for a wide range of applications such as automotive and industrial power supplies, power adapters, laptop computers, and battery chargers. It can be used to drive two outputs independently for applications such as multiphase blinky circuits, multiple boost converters, power inverters, and programmable regulators. It is also well-suited for applications requiring an adjustable output voltage, such as AC-DC and DC-DC converters, and portable electronics.

Working Principle

The LT3782AIUFD#PBF is a dual channel, synchronous buck and boost switching controller. It receives an input voltage and drives two internal P-channel MOSFETs in a buck or boost topology, depending on the direction of the input-output voltage relationship.The voltage at the output is controlled by a current mode controller with programmable parameters, allowing for an adjustable output voltage range of 3.3 V up to 28 V. The internal controller features a low quiescent current and ultra-fast load step response, making it suitable for high performance applications.It also features fold back current limit, adjustable frequency and duty cycle, programmable undervoltage lockout, ramp rate and slew rate reduction. The controller can be programmed to shut down or enter a low current state in the event of an error condition.

Conclusion

The LT3782AIUFD#PBF is an ideal solution for applications requiring an adjustable output voltage, such as power adapters and automotive power supplies. It features a low quiescent current, ultra-fast load step response, overvoltage protection, fold back current limit and thermal shutdown, making it suitable for high performance applications. The unique dual-channel architecture allows it to drive two outputs independently, making it well-suited for applications such as multiphase blinky circuits, multiple boost converters, power inverters, and programmable regulators.

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