LT3971EDD-3.3#TRPBF

Voltage - Output (Min/Fixed):	3.3V
Base Part Number:	LT3971
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:	200kHz ~ 2MHz
Current - Output:	1.2A
Voltage - Output (Max):	--
Series:	--
Voltage - Input (Max):	38V
Voltage - Input (Min):	4.3V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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LT3971EDD-3.3#TRPBF Application Field and Working Principle

LT3971EDD-3.3#TRPBF belongs to a kind of DC DC switching regulator, also known as switching mode power supply (SMPS). A DC-DC switching regulator, as the name implies, is a voltage regulator based on switch control, and the primary purpose is to supply well-regulated output voltage from a wide range of input voltages. This article will discuss the general application field of LT3971EDD-3.3#TRPBF and its working principle.

Application Field of LT3971EDD-3.3#TRPBF

LT3971EDD-3.3#TRPBF is an Integrated Circuit (IC) designed as an adjustable, internal high speed (200 KHz), step-down switching regulator. It is designed to drive highly efficient synchronous rectifier buck converters with up to 1.5A of continuous output current. This switching regulator is used in many applications, such as portable electronics and instrumentation. The LT3971EDD-3.3#TRPBF switching regulator can easily be activated by using a logic-level voltage. Its design was optimized for small size, low cost and high efficiency.The LT3971EDD-3.3#TRPBF switching regulator has a wide range of input voltages from 2V to 80V. It also supports an adjustable output voltage from 0.55V to 19V. This IC is used in wide variety of applications, from automotive to industrial, such as batteries, LED drivers, power distribution and power management systems.

Working Principle of LT3971EDD-3.3#TRPBF

The LT3971EDD-3.3#TRPBF DC-DC switching regulator works through impulse voltage reduction. The main circuit consists of two parts: the power conversion circuit and the control circuit. The power conversion circuit is composed of a switching element, transformers, current detection circuit, inductor, capacitor, rectifier and voltage stabilizing circuit, while the control circuit is composed of control logic, timer, feedback control circuit and dual gate MOSFET.When the input voltage is higher than the preset output voltage, switches are opened and closed by the control signals. The alternating voltage generated by the switches passes through the transformer, and then the rectifier circuit rectifies the alternating voltage into a DC voltage. The voltage is then stabilized by the voltage stabilizing circuit and output.The operation of the power circuit relies on the control circuit. The feedback control loop regulation is achieved by the Hall-effect current sensing and voltage sensing. The Hall-effect sensor provides a current sense signal which is compared to the output of the error amplifier, and the error amplifier output will control the pulse-width modulation (PWM) circuit to adjust the duty cycle. By adjusting the PWM duty cycle accordingly, so that the desired output voltage is maintained.The PWM enable line provided by the input voltage enable, enable/power-down input, enable/soft-start output, enable/overvoltage lockout and output short protection provides the power to start and stops the PWM. The frequency of the PWM is thus determined by the characteristics of the internal or external clock.In summary, LT3971EDD-3.3#TRPBF is a synchronous, DC-DC switching regulator from Linear Technology. With its wide range of input and output voltage, LT3971EDD-3.3#TRPBF IC is used in various applications. Its switching regulator works by reducing an input voltage through impulse voltage, while the feedback control loop is achieved by the Hall-effect current sensing and voltage sensing. The frequency of the PWM is thus determined by the characteristics of the internal or external clock.

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