LT83401

Name: LT83401
Brand: Analog Devices
Price: 2.74 USD
Availability: InStock

RECOMMENDED FOR NEW DESIGNS

42V, 1A/2.5A Step-Down Silent Switcher 3 with Ultra-Low Noise Reference

Data Sheet (Rev. 1) Product Selection Table

Part Models: 4
1ku List Price: Starting From $2.74

Viewing:

Overview

Silent Switcher® 3 Architecture

Ultra-Low RMS Noise (10Hz–100kHz): 2.8μV_RMS
Ultra-Low Spot Noise: 4nV/√Hz at 10kHz
Ultra-Low EMI Emissions

Ultra-Fast Transient Response

Minimizes the Output Capacitance

High Efficiency at High Frequency

Up to 92.4% Efficiency at 2MHz, 12V_IN to 5V_OUT

Input Voltage Range: 2.8V to 42V
Output Voltage Range: 0V to (V_IN - 1V)

Unity Gain Configuration Up to 15V_OUT

Fast Minimum Switch On-Time: 22ns
Precision Reference: ±0.8% Over Temperature with Remote Sense
Forced Continuous Mode Capability
Adjustable and Synchronizable: 300kHz to 6MHz;
Programmable Power Good
Tiny, 15-Lead 3mm x 2mm LFCSP Package;
Pin-to-Pin Compatible Family: LT83201 (18V, 1A), LT83203 (18V, 3A), and LT83205 (18V, 5A)
AEC-Q100 Qualified for Automotive Applications

Part Models: 4
1ku List Price: Starting From $2.74

Documentation

Data Sheet 1

LT83401/LT83402: 42V, 1A/2.5A Step-Down Silent Switcher 3 with Ultra-Low Noise Reference Data Sheet (Rev.1) 05/13/2026

User Guide 1

EVAL-LT83401-AZ/LT83402-AZ User Guide: 42V, 1A/2.5A Step-Down Silent Switcher 3 with Ultra-Low Noise Reference (Rev.1) 02/20/2026

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LT83401RUDB#TRMPBF	LFCSP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT83401RUDB#TRPBF	LFCSP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT83401RUDB#WTRMPBF	LFCSP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT83401RUDB#WTRPBF	LFCSP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Mar 20, 2026 - 26_0080 LT83401/2 Data Sheet EC Table Specification Change
		PCN26_0080_Form Material_Report Datasheet Specification Comparison
LT83401RUDB#TRMPBF	PRODUCTION
LT83401RUDB#TRPBF	PRODUCTION
LT83401RUDB#WTRMPBF	PRODUCTION
LT83401RUDB#WTRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

Can't find the software or driver you need?

Request a Driver/Software

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LT83401

LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:

LT83401

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

42V, 1A/2.5A Step-Down Silent Switcher 3 with Ultra-Low Noise Reference

Buy Now View Details

Product Details

The EVAL-LT83401-AZ and EVAL-LT83402-AZ (abbreviated as EVAL-LT83401/2-AZ) demonstration boards are 42V, 1A, and 2.5A synchronous Silent Switcher^® 3 step-down regulators with ultra-low noise, high efficiency, and power density, featuring the LT83401 and LT83402 (abbreviated as LT83401/2), respectively. The input voltage range of the EVAL-LT83401/2-AZ is 4.8V to 42V. The default demo board setting is 3.3V output with a maximum 1A/2.5A DC output current. The LT83401/2 is a compact, ultra-low noise, ultra-low emission, high efficiency, and high-speed synchronous monolithic step-down switching regulator. The uniquely designed combination of the ultra-low noise reference and third-generation Silent Switcher architecture enables the LT83401/2 to achieve both high efficiency and excellent wideband noise performance. A minimum on-time of 22ns allows high V_IN to low V_OUT conversion at high frequency.

The LT83401/2’s switching frequency can be programmed either through an external resistor (RT) or an external clock over a 300kHz to 6MHz range. The default frequency of EVAL-LT83401/2-AZ demo boards is 2MHz. The SYNC/MODE pin on the demo boards is connected to ground by default for pulse-skip mode operation. To synchronize to an external clock, move JP1 to SYNC and apply the external clock to the SYNC terminal. Select the forced continuous mode (FCM) by moving the JP1 shunt, respectively. Figure 1 and Figure 2 in the User Guide show the efficiency of the EVAL-LT83401/2-AZ at the 12V and 24V inputs in FCM operation (input from V_IN terminal). Figure 3 shows the temperature rise of the LT83401 on the EVAL-LT83401-AZ demo board under 12V and 24V input voltage conditions across the full load range. Figure 4 shows the temperature rise of the LT83402 on the EVAL-LT83402-AZ demo board under 12V and 24V input voltage conditions across the full load range. The case temperature rise was measured with the following reference points: The peak IC case temperature and a point on the board, marked with a red ‘X’ as shown in the thermal images Figure 12 and Figure 13 in the User Guide.

Please see the User Guide for the full description.