LT3971EDD#TRPBF

Voltage - Output (Min/Fixed):	1.19V
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):	30V
Series:	--
Voltage - Input (Max):	38V
Voltage - Input (Min):	4.3V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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LT3971EDD#TRPBF Application Field and Working PrincipleThe LT3971EDD#TRPBF is a high efficiency, synchronous, step-down switching regulator with integrated high side synchronous and low side switches. It is part of the LT3971 family of regulators from Linear Technology. The regulator is designed to work from a 5 V input with an output voltage adjustable from 0.5 V to 4.5 V. It utilizes a unique spread spectrum frequency modulation technique which allows for low output voltage ripple, fast transient response and high efficiency over a wide input voltage range.The LT3971EDD#TRPBF can be used in a variety of applications, such as LED lighting, point-of-load DC/DC power supplies, automotive power supplies, battery-fed systems, and portable high-frequency power supplies. The regulator is available in standard wafer-level packages and also comes in a low-profile, small-footprint SOT-23-6 package.The LT3971EDD#TRPBF uses a very simple working principle. The device operates by using a pulse-width modulation (PWM) control scheme to regulate the output voltage. The output voltage is determined by the ratio of ON time (TON) and OFF time (TOFF). The TON time is proportional to the difference between the feedback voltage and the reference voltage. When the feedback voltage is greater than the reference voltage, the device turns OFF and the output voltage drops. When the feedback voltage is less than the reference voltage, the device turns ON and the output voltage rises. As the error (feedback voltage minus reference voltage) increases, the difference between the TON and TOFF times increases and thus results in faster response time and higher output voltage regulation accuracy.The LT3971EDD#TRPBF is designed to have a high switching frequency of 1.5 MHz. This allows the regulator to achieve a fast transient response while still being able to use small external components. The integrated high side switch helps to reduce the total number of external components required, as well as minimize the bill of materials (BOM). The device also includes a set of external MOSFETs that are optimized for high efficiency operation, with the total efficiency ranging up to 95%.The LT3971EDD#TRPBF also includes a comprehensive set of integration features. These include on-chip loop compensation and adjustable offset compensation, allowing the user to configure the regulator to accurately regulate the desired output voltage over the temperature range of -40°C to +125°C. It also features adjustable soft-start, adjustable current limit, overvoltage protection, undervoltage lockout, and valley current protection to keep the system safe.Overall, the LT3971EDD#TRPBF is an ideal choice for a wide range of applications, thanks to its low solution cost, small size, and high efficiency. Combined with its comprehensive set of features, it can provide a reliable and cost effective solution for many different applications.

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