LT83205

RECOMMENDED FOR NEW DESIGNS

18V, 5A Step-Down Silent Switcher 3 with Ultra-Low Noise Reference

Analog Devices LT83205 Product Info

10 February 2026 6

Features

Silent Switcher^® 3 Architecture

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

Ultra-Fast Transient Response

<1μs Transient Recovery Time

High Efficiency at High Frequency

Up to 93% Efficiency at 2MHz, 12V_IN to 3.3V_OUT
Up to 90% Efficiency at 4MHz, 12V_IN to 3.3V_OUT

Input Voltage Range: 2.8V to 18V
Output Voltage Range: 0V to (V_IN − 0.5V)

Unity Gain Configuration up to 13V Output

Maximum Continuous Output Current

LT83205: 5A

Fast Minimum Switch On-Time: 15ns
Adjustable and Synchronizable: 300kHz to 6MHz;
Precision Reference: ±0.7% Over Temperature with Remote Sense;
Supports Dynamic Output Voltage Control
Pin Selectable Forced Continuous Mode or Pulse-Skipping Mode
Programmable Power Good
Tiny 15-Lead 3mm × 2mm LFCSP Package;
Pin-to-Pin Compatible Family: LT83201 (1A), LT83203 (3A), LT83205 (5A)

Part details & applications

The LT83203/LT83205 synchronous step-down regulator is uniquely designed to combine an ultra-low 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 EMI emissions while delivering high efficiency at high switching frequencies.

The LT83203/LT83205 is ideal for high-current, noise-sensitive applications that benefit from the high efficiency of a synchronous switching regulator.

APPLICATIONS

RF Power Supplies: PLLs, VCOs, Mixers, LNAs, PAs
High Speed/High Precision ADCs/DACs
Low Noise Instrumentation
General Purpose Power Supply

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