Add to Signal Chain Designer

ADP125:  5.5V Input, 500 mA, Low Quiescent Current, CMOS Linear Regulator w/External Voltage Divider

Product Details

Product Status:Recommended for New Designs

The ADP124/ADP125 are low quiescent current, low dropout linear regulators. They are designed to operate from an input voltage between 2.3 V and 5.5 V and to provide up to 500 mA of output current. The low 130 mV dropout voltage at a 500 mA load improves efficiency and allows operation over a wide input voltage range.

The low 210 μA of quiescent current with a 500 mA load makes the ADP124/ADP125 ideal for battery-operated portable equipment. The ADP124 is capable of 31 fixed-output voltages from 1.75 V to 3.3 V. The ADP125 is the adjustable version of the device and allows the output voltage to be set between 0.8 V and 5.0 V by an external voltage divider. The ADP124/ADP125 are specifically designed for stable operation with tiny 1 μF ceramic input and output capacitors to meet the requirements of high performance, space constrained applications.

The ADP124/ADP125 have an internal soft start that gives a constant start-up time of 350 μs. Short-circuit protection and thermal overload protection circuits prevent damage in adverse conditions. The ADP124/ADP125 are available in an 8-lead exposed paddle MSOP package. When compared with the standard MSOP package, the exposed paddle MSOP package has lower thermal resistance (θJA). The lower thermal resistance package allows the ADP124/ADP125 to meet the needs of a variety of portable applications while minimizing the rise in junction temperature.

  • Digital camera and audio devices
  • Portable and battery-powered equipment
  • Automatic meter reading (AMR) meters
  • GPS and location management units
  • Medical instrumentation
  • Point of load power


  • Input voltage supply range: 2.3 V to 5.5 V
  • 500 mA maximum output current
  • Fixed and adjustable output voltage versions
  • 1% initial accuracy
  • Up to 31 fixed-output voltage options available from 1.75 V to 3.3 V
  • Adjustable-output voltage range from 0.8 V to 5.0 V
  • Very low dropout voltage: 130 mV
  • Low quiescent current: 45 μA
  • Low shutdown current: <1 μA
  • Excellent PSRR performance: 60 dB at 100 kHz
  • Excellent load/line transient response
  • See data sheet for additional features

Typical Application Circuit for ADP125


Title Content Type File Type
ADP124/ADP125: 5.5 V Input, 500 mA, Low Quiescent Current, CMOS Linear Regulators Datasheet (Rev C, 06/2012) (pdf, 669 kB) Data Sheets PDF
AN-1329: Noise Reduction Network for Adjustable Low Dropout Regulators  (pdf, 486 kB) Application Notes 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
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
Isolating Power in Communication Bus and Gate Drive Applications
Starting with a communications application overview of small power options through the process of selecting the right power products this webcast is a great resource for your communications applications designs.
Webcasts WEBCAST
UG-056: Setting Up the Evaluation Board for the ADP124/ADP125  (pdf, 317 kB) User Guides PDF
RAQs index Rarely Asked Questions HTML
What are LDOs and how are they used? FAQs/RAQs 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
ADP150 Regulator Fixed Voltage Linux Driver Device Drivers 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

ADP125 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
ADP125ACPZ-R7 Status: Production 8 ld LFCSP (2x2mm) 8 Ind Reel, 3000 - $0.42 Y  Material Info PCN Purchase Sample
ADP125ARHZ Status: Production EXPOSSED PAD SOIC 8 Ind Tube, 50 $0.70 $0.68 Y  Material Info PCN Purchase
ADP125ARHZ-R7 Status: Production EXPOSSED PAD SOIC 8 Ind Reel, 1000 - $0.68 Y  Material Info PCN Purchase
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.

ADP125 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
ADP125CP-EVALZ Status: Production Evaluation Board $60.00 Yes -
ADP125-EVALZ Status: Production Evaluation Board $60.00 Yes -

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

Check Inventory & Purchase

View Sales and Distribution Offices

content here.
content here.

Review this Product