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ADP3331:  High Accuracy, Ultra-Low Quiescent Current LDO; SOT-23

Product Details

The ADP3331 is a member of the ADP330x family of precision low dropout anyCAP voltage regulators. The ADP3331 operates with an input voltage range of 2.9 V to 12 V and delivers a load current up to 200 mA. The ADP3331 stands out from the conventional LDO's with a novel architecture and an enhanced process which enables it to offer performance advantages and higher output current than its compeititon. Its patented design requires only a 0.47 µF output capacitor for stability. This device is insensitive to capacitor Equivalent Series Resistance (ESR), and is stable with any good quality capacitor, including ceramic (MLCC) types for space restricted applications. The ADP3331 achieves exceptional accuracy of ± 0.7% at room temperature and ± 1.4% overall accuracy over temperature, line and load variations. The dropout voltage of the ADP3331 is only 140 mV (typical) at 200 mA. This device also includes a safety current limit, thermal overload protection and a shutdown feature. In shutdown mode, the ground current is reduced to less than 2 µA. The ADP3331 has ultralow quiescent current 34 µA (typical) in light load situations. The SOT-23-6 package has been thermally enhanced using Analog Device's proprietary Chip-on-Lead feature to maximize power dissipation.


  • High Accuracy over Line and Load: ±0.7% @ 25°C, 1.4% over Temperature
  • Ultralow Dropout Voltage: 140 mV (Typ) @
    200 mA
  • Can Be Used as a High Current (>1 A) LDO Controller
  • Requires Only CO = 0.47 µF for Stability
  • anyCAP = Stable with Any Type of Capacitor (Including MLCC)
  • Current and Thermal Limiting
  • Low Noise
  • Low Shutdown Current: 10 nA Typical
  • 2.6 V to 12 V Supply Range
  • 1.5 V to 11.75 V Output Range
  • –40°C to +85°C Ambient Temperature
  • Ultrasmall Thermally Enhanced
    Chip-on-Lead™ SOT-23-6
    Lead Package

Functional Block Diagram for ADP3331


Title Content Type File Type
ADP3331: Adjustable Output Ultralow IQ, 200 mA, SOT-23, anyCAP® Low Dropout Regulator Data Sheet (Rev B, 02/2014) (pdf, 350 kB) Data Sheets PDF
AN-1072: How to Successfully Apply Low Dropout Regulators  (pdf, 105 kB)
This application note reviews the basic LDO topology, explains key specifications, and shows the application of low dropout voltage regulators in systems.
Application Notes PDF
AN-262: Low-Noise Low Drop-Out Regulator for Portable Equipment  (pdf, 341 kB) Application Notes PDF
Introduction to ADIsimPower
ADIsimPower is a smart selector and a collection of downloadable tools that produce complete and optimized power designs. Schematic, bill of materials, and performance data are customized to your specific needs in minutes.
Videos HTML
EVAL-ADP3330/ADP3331  (pdf, 296 kB)
3V, 200 mA anyCAP LDO Evaluation Board
Evaluation Kit Manuals PDF
The Fundamentals of LDO Design and Applications Technical Articles HTML
Linear Regulators Parametric Search Product Selection Guide HTML
What are LDOs and how are they used? FAQs/RAQs HTML
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
ADI Linear Regulator Design Tool and Parametric Search  (zip)
Microsoft Excel download tool from ADIsimPower to generate a power supply design complete with a schematic, bill of materials, and performance specifications.
ADIsim Design/Simulation Tools ZIP
Download files for ADIsimPower™ Voltage Regulator Design Tool
The individual Excel-based voltage regulator design tools used in ADIsimPower™.
ADIsim Design/Simulation Tools HTML
ADIsimPower™ Voltage Regulator Design Tool
This expert design tool produces custom DC-DC converter designs in about a minute. The user enters 5 inputs and chooses to optimize for efficiency, PCB space, cost, or part count. Output is a complete schematic, BOM, efficiency plot, and performance summary. A PDF summary and a blank PCB is offered for each design to facilitate fast prototyping to verify the design.
ADIsim Design/Simulation Tools HTML
Launch of ADIsimPower Voltage Regulator Selection Vin (min) V Vout V   Find Solutions
Vin (max) V Iout A

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

SampleSample & Buy

Price, packaging, availability

Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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