Voltage - Output (Min/Fixed):	5V
Base Part Number:	LT3973
Supplier Device Package:	10-DFN (3x3)
Package / Case:	10-WFDFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	195kHz ~ 2.15MHz
Current - Output:	750mA
Voltage - Output (Max):	--
Series:	--
Voltage - Input (Max):	42V
Voltage - Input (Min):	4.2V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tube

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Introduction to LT3973EDD-5#PBF Application Field and Working Principle

Overview

The LT3973EDD-5#PBF is a synchronous buck switching regulator solution, primarily applied in applications requiring high efficiency, low output ripple and good transient response. This device includes the control circuitry, drivers, and the synchronous power MOSFETs required to form a high performance switching regulator. This device features PowerPath™ charging with accurate, programmable input current limiting, UVLO, internal compensation, power good, and soft-start, making it ideal for a wide range of applications.The LT3973EDD-5#PBF is designed to operate through a wide input voltage range from 1.8V to 18V. It also offers adjustable output voltages from 0.8V to 16V with a maximum continuous current of 6A. Packaged in a 5mmx6mm QFN package, this device offers excellent thermal performance, conveniently permitting the use of small, low cost RF-4A- or I-4A-rated inductors for size-optimized design.

Application Field

The LT3973EDD-5#PBF is developed for applications requiring a wide input voltage range, high efficiency, low output ripple and good transient response. This devices enables charging and powering of products with a wide input voltage range. For example, it is commonly used in industrial automation applications, communication systems, automotive devices and consumer electronics.

Working Principle

The LT3973EDD-5#PBF offers an adjustable output voltage and includes the control circuitry, drivers and the synchronous power MOSFETs required to form a high performance switch mode power supply. The device can operate from a wide input voltage range from 1.8V to 18V.The LT3973EDD-5#PBF is a synchronous buck converter, in which the switching frequency is locked to between 200kHz and 3MHz to provide a stable output voltage with low noise and ripple. This is achieved by a valley switching architecture, in which the PWM signal is generated by a fixed frequency to the main FET and is in each cycle delayed until the voltage across the current sense resistance drops below a specific valley level to control the conduction angle.In order to achieve the desired output voltage, the device includes an internal voltage feedback loop holding an average voltage error signal. This is accomplished by monitoring the output voltage by the on board voltage sense circuit and adjusting the switching frequency and duty cycle as required.To ensure fast transient response and low output ripple, the device uses a tightly regulated, internal peak current limit to limit the upper current limit of the inductor and ending the conduction cycle when the inductor current reaches its peak current limit.The LT3973EDD-5#PBF also provides frequency foldback in which the switching frequency is automatically decreased as the load current decreases, allowing higher efficiencies of at light loads.

Conclusion

The LT3973EDD-5#PBF is a synchronous buck control IC with a wide input voltage range of 1.8V to 18V, an adjustable output voltage range of 0.8V to 16V, a maximum continuous current of 6A and a fixed switching frequency of between 200kHz and 3MHz. It offers integrated power MOSFETs, current sense circuitry and an internal voltage feedback loop to provide fast transient response, low ripple and good efficiency even at light loads. All of these features make it suitable for various applications such as industrial automation, communication systems, automotive devices and consumer electronics.

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