LT83401

RECOMMENDED FOR NEW DESIGNS

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

Analog Devices LT83401 Product Info

10 February 2026 5

Features

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 Qualification in Progress

Part details & applications

The LT^®83401/LT^®83402 synchronous step-down regulator is uniquely designed to combine an ultralow- noise reference with Silent Switcher architecture to achieve both high efficiency and excellent wideband noise performance.

The innovative, ultra-low noise architecture provides exceptional low-frequency (0.1Hz to 100kHz) output noise performance in a switching regulator. The output voltage can be programmed with a single resistor, resulting in virtually constant output noise independent of output voltage.

Silent Switcher architecture minimizes Electromagnetic interference (EMI) emissions while delivering high efficiency at high switching frequencies.

The LT83401/LT83402 is ideal for high-current, noisesensitive applications that benefit from the high efficiency of a synchronous switching regulator.

APPLICATIONS

Automotive and Industrial Power Supplies
Medical Applications: Imaging and Diagnostics
High-Speed and High-Precision Data Converters
Bipolar, Very Low-Noise Power Supplies
Low-Noise Instrumentation and Displays

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