LT83203

RECOMMENDED FOR NEW DESIGNS

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

Data Sheet (Rev. 0) Product Selection Table

Part Models: 2
1ku List Price: Starting From $2.40

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Part Details

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

LT83203: 3A

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 Models: 2
1ku List Price: Starting From $2.40

Documentation

Data Sheet 1

LT83203/LT83205: 18V, 3A/5A Step-Down Silent Switcher 3 with Ultra-Low Noise Reference (Rev.0) 03/03/2025

User Guide 1

EVAL-LT83203-AZ/EVAL-LT83205-AZ User Guide: 18V, 3A/5A Step-Down Silent Switcher 3 with Ultra-Low Noise Reference (Rev.0) 03/03/2025

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
LT83203RUDB#TRMPBF	LFCSP:LEADFRM CHIP SCALE	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT83203RUDB#TRPBF	LFCSP:LEADFRM CHIP SCALE	Material Declaration Reliablity Data	Ultra Librarian SamacSys

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

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Evaluation Kits

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

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Product Details

The EVAL-LT83203-AZ and EVAL-LT83205-AZ (abbreviated as EVAL-LT83203/5-AZ) demonstration boards are 18V, 3A, and 5A Silent Switcher^® 3 step-down regulators with ultra-low noise, high efficiency, and power density, featuring the LT83203 and LT83205 (abbreviated as LT83203/5), respectively. The input voltage range of the EVAL-LT83203/5-AZ is 2.8V to 18V. The default demo board setting is 1V output with a maximum DC output current of 3A/5A. The LT83203/5 is a compact, ultra-low noise, ultra-low emission, high efficiency, 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 LT83203/5 to achieve excellent wideband noise performance. A minimum on-time of 15ns allows high V_IN to low V_OUT conversion at high frequency.

Please see the User Guide for the full description.