LT3741EFE#PBF

Frequency - Switching:	200kHz ~ 1MHz
Base Part Number:	LT3741
Supplier Device Package:	20-TSSOP-EP
Package / Case:	20-TSSOP (0.173", 4.40mm Width) Exposed Pad
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Enable, Frequency Control, Soft Start
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	Yes
Duty Cycle (Max):	--
Series:	--
Voltage - Supply (Vcc/Vdd):	6 V ~ 36 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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LT3741EFE#PBF, classified as PMIC - Voltage Regulators - DC DC Switching Controllers, is a highly integrated, dual-input synchronous buck switching controller that provides a high power conversion efficiency with adjustable output voltage and wide 4.75V to 65V input voltage range. It is typically used to power loads in switching power supplies, solar power systems, industrial computers, communications, test and measurement equipment, digital home appliances and other applications. Working PrincipleLT3741EFE#PBF works by implementing an active voltage situation. The core operating principle revolves around its two transitions - "charge" and "discharge". In the charge transition, current is drawn from the input source and supplied to the output load. During this period, the device is essentially an inductor, temporarily storing energy in its magnetic field. On the other hand, during the discharge transition, energy stored in the inductor is used to supply current to the output load. With this oscillating pattern of charge and discharge, current can be provided at the output in spite of changes in input voltage and/or load current.Output Voltage Setting and Soft-startThe output voltage setting can be adjusted by connecting a resistive voltage divider from the FB pin to ground. The voltage set using the voltage divider is compared with the internal reference voltage and an error amplifier amplifies the difference between the two values to obtain the appropriate control signal for the controller.The Soft-start feature can be enabled by connecting an external capacitor to the SS pin. Connecting the SS pin to ground disables the Soft-start feature and the controller starts up instantly. The Soft-start feature is essential to limit the inrush current during startup or when the load is increased, avoiding transient overvoltage or tripping of circuit protection circuits.Bi-directional Current LimitingBi-directional current limiting allows effective in-rush current prevention and current limit protection when two input sources are connected in parallel. The controller can limit the current flowing into either one of the inputs while the other input source provides power to the output load. This allows the controller to operate at the optimal current draw with very low losses, improve overall efficiency and maximize system reliability.Output Short ProtectionThe LT3741EFE#PBF includes an output short circuit protection feature which allows the controller to detect an output short circuit condition and switch off the synchronous FET\'s to minimize power dissipation in the controller.Undervoltage LockoutAn adjustable undervoltage lockout circuit ensures that the load is not powered during undervoltage conditions, eliminating problems related to unnecessary switching and power dissipation.Spread Spectrum FunctionThe Spread Spectrum function provides significant reduction in EMI radiation, allowing better compliance with FCC regulation and improved system stability without compromising the performance of the switching converter.Thermal ShutdownThermal shutdown is an active over temperature protection function that monitors the die temperature and shuts down the power conversion loop in the event of an over temperature condition.ConclusionThe LT3741EFE#PBF is an advanced and highly integrated dual-input synchronous buck switching controller that provides a high power conversion efficiency with adjustable output voltage, wide input voltage range, current limiting, and a number of additional features that make it an ideal choice for applications such as solar power systems, industrial computers, communications, test and measurement equipment, and digital home appliances.

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