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LT3971EMSE#PBF

ADILT3971EMSE#PBF

Analog Devices Inc.
Buck Switching Regulator IC Positive Adjustable 1.19V 1 Output 1.2A 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
NRND8,677 in stock
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Overview

The LT3971EMSE#PBF is an adjustable step-down switching regulator that supports a wide input voltage range from 4.3V to 38V. It delivers up to 1.2A of output current while maintaining extremely low quiescent current, making it highly efficient for systems with long standby times. The device operates at a constant frequency and includes an integrated power switch for simplified PCB layouts.

Why Choose This Part

The primary advantage is its ultralow quiescent current of only 2.8 microamps, which significantly extends battery life in light-load conditions. Its wide 4.3V to 38V input range handles large transients, while the 10-MSOP exposed pad package provides excellent thermal performance in a small footprint.

Applications

Industrial Control Systems
Regulating 24V industrial rails down to 3.3V or 5V logic levels with high efficiency.
Automotive Standby Systems
Powering always-on electronics from a 12V battery while minimizing parasitic drain during vehicle off-states.
Distributed Supply Regulation
Local point-of-load regulation in systems with high-voltage bus architectures up to 38V.

Key Specifications

Function Step-Down
Topology Buck
Output Type Adjustable
Mounting Type Surface Mount
Package / Case 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
Current - Output 1.2A
Number of Outputs 1
Output Configuration Positive
Frequency - Switching 200kHz ~ 2MHz
Operating Temperature -40degC ~ 125degC (TJ)
Synchronous Rectifier No
Voltage - Input (Max) 38V
Voltage - Input (Min) 4.3V
Voltage - Output (Max) 30V
Supplier Device Package 10-MSOP-EP
Voltage - Output (Min/Fixed) 1.19V

Getting Started

Designers should follow the datasheet recommendations for low-ESR ceramic capacitors and high-frequency layout techniques to minimize EMI. Use the LTpowerCAD tool from Analog Devices to calculate component values for the feedback network and inductor selection based on the desired 1.19V to 30V output range.