LT3758IDD#PBF

Frequency - Switching:	100kHz ~ 1MHz
Base Part Number:	LT3758
Supplier Device Package:	10-DFN (3x3)
Package / Case:	10-WFDFN Exposed Pad
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Enable, Frequency Control, Soft Start
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	No
Duty Cycle (Max):	--
Series:	--
Voltage - Supply (Vcc/Vdd):	5.5 V ~ 100 V
Output Phases:	1
Number of Outputs:	1
Topology:	Boost, Flyback, SEPIC
Output Configuration:	Positive or Negative, Isolation Capable
Function:	Step-Up, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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LT3758IDD#PBF: Application Field and Working PrincipleAs one of the most popular DC-DC switching controllers, the LT3758IDD#PBF is a full-featured, high-efficiency, synchronous step-down DC-DC controller that provides a very efficient, compact, and powerful solution for many power-conversion applications. The LT3758IDD#PBF is a monolithic integrated circuit that provides high-output current and ultra-low quiescent current, which can significantly reduce the power dissipation in applications such as computing, networking, and embedded-systems power conversion. In addition, the LT3758IDD#PBF is a synchronous step-down DC-DC controller that integrates a current-mode control loop with a true-load-disconnect power switch. This architecture is designed to produce high-efficiency, low-emission step-down DC-DC converters.Application FieldsThe LT3758IDD#PBF has a wide range of application fields. It can be used in telecom-systems power management, from system level power distribution to core power-supply implementations. It also can be used in industrial and biomedical automated systems, and in computer servers and network infrastructure. The LT3758IDD#PBF can also be used in automotive infotainment and entertainment applications, such as head-unit and amplifier power supplies. Moreover, it can be used in consumer electronics and white goods. It serves well in intermittent-load-power-delivery applications that require space saving, high efficiency and low emissions.Functional Block DiagramThe LT3758IDD#PBF features a simple and efficient functional block diagram. The main component of the LT3758IDD#PBF is its true-load-disconnect power switch, which can be used as either a step-up or step-down converter. The power switch is driven by the output of the error-amp, which compares the FB input voltage with that of an internal reference voltage. The error-amp is also connected to a voltage doubler, which provides the necessary gate drive to turn on the power switch. As well as a voltage doubler, the LT3758IDD#PBF also includes an adjustable current-sense amplifier, a soft-start and undervoltage-lockout circuit, and a thermal-shutdown protection circuit.Working PrincipleThe LT3758IDD#PBF works based on the principle of current-mode control. In this method, the voltage across the power switch is monitored, and the error-amp output adjusts the peak inductor current so as to keep the voltage across the power switch constant. This ensures that the power-conversion efficiency is maximized. The voltage doubler establishes the correct gate drive for the power switch. The current-sense amplifier detects the current passing through the power switch, is amplified and then compared with the programmable current reference (IREF). The error-amp then adjusts the amount of current passing through the power switch by varying the gate drive to the power switch. The LT3758IDD#PBF also features a comprehensive protection circuit. This includes an adjustable under-voltage lockout circuit, a thermal-shutdown circuit, and a soft-start circuit which helps prevent inrush current at power up. Additionally, a LINE and LOAD disconnect switch is included to provide true load disconnection, thus avoiding any leakage currents or voltage stresses during shutdown.ConclusionThe LT3758IDD#PBF is a full-featured, high-efficiency, synchronous step-down DC-DC controller that provides a very efficient, compact, and powerful solution for many power-conversion applications. With its integrated true-load-disconnect power switch, current-mode control loop and comprehensive protection circuit, the LT3758IDD#PBF is well-suited to a wide range of applications requiring space saving, high efficiency, and low emissions.

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