LT3742EUF#PBF

Frequency - Switching:	500kHz
Base Part Number:	LT3742
Supplier Device Package:	24-QFN (4x4)
Package / Case:	24-WFQFN Exposed Pad
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Enable, Power Good
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	100%
Series:	--
Voltage - Supply (Vcc/Vdd):	4 V ~ 30 V
Output Phases:	2
Number of Outputs:	2
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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Introducation

LT3742EUF#PBF is one of the popular DC–DC switching controllers offered by Linear Technology (LT). It is a high-efficiency, high-current mode synchronous step-down switching regulator that features adaptive-on-time™ current mode control. This switching controller is suitable for a wide variety of applications such as point-of-load (POL) converters, margin-adjustable voltage regulators, and power over ethernet (PoE) switches.

Application

LT3742EUF#PBF is mainly used in applications where a wide range of output voltages and currents are required such as POL converters, margin-adjustable voltage regulators, PoE switches and battery-powered applications. Its low quiescent current (95 µA operating current @ 1 MHz) and high efficiency (up to 95%) make it suitable for use in applications where power consumption and efficiency are key considerations.The LT3742EUF#PBF also has a unique unique auto-tracking feature that allows the output voltage to be margined with a simple toggle of a single pin. This feature is useful in applications such as point-of-load voltage regulators or margin-adjusted systems where the output voltage needs to be adjusted to meet different conditions.

Features

The LT3742EUF#PBF DC–DC switching controller has some excellent features that make it an ideal choice for a variety of applications.

• Integrated high-side and low-side power MOSFETs
• Programmable frequency (up to 1 MHz conversion rate)
• Bi-directional output synchronous rectification for high efficiency
• Wide input voltage range (4.5 V to 60 V)
• Programmable overcurrent protection
• Programmable soft-start
• Precise enable/disable
• Power-good indicator
• Adjustable output voltage (down to 0.6 V)
• Optional auto-tracking feature

Working Principle

The LT3742EUF#PBF DC–DC switching controller is based on a synchronous step-down converter topology which has some unique features that enable it to achieve high efficiency. The topology works by controlling the switching of two power MOSFETs (high-side and low-side) as well as the direction of current flow through the inductor.The controller employs an adaptive-on-time current-mode control scheme that adjusts the switching frequency and duty cycle to ensure that the output voltage remains in regulation. This scheme is more efficient compared to a traditional constant-frequency control, as the switching frequency is adjusted based on load conditions resulting in higher efficiency over the entire load range.The controller also features a unique bi-directional synchronous rectification scheme, which allows the high-side and low-side MOSFETs to operate as either a load switch or synchronous rectifier, depending on the conditions. This feature enables the LT3742EUF#PBF to achieve high efficiency over a wide load range.The LT3742EUF#PBF is also equipped with a number of protection features such as overcurrent protection, short-circuit protection, soft-start, power-good indicator, and adjustable output voltage.

Conclusion

The LT3742EUF#PBF DC–DC switching controller is a versatile and efficient solution for a wide range of applications. Its unique features such as adaptive-on-time current-mode control, bi-directional synchronous rectification, and auto-tracking capability makes it an ideal choice for applications such as point-of-load voltage regulators and margin-adjustable systems. Its wide input voltage range and programmable frequency also make it suitable for use in a variety of power-constrained applications.

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