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ADP2125:  Low Profile, 500 mA, 6 MHz, Synchronous Step-Down, DC-to-DC Converter

Product Details

Product Status:Recommended for New Designs

The ADP2125 is a high frequency, step-down, dc-to-dc converter optimized for portable applications in which board area and battery life are critical constraints. Fixed frequency operation at 6 MHz enables the use of tiny ceramic inductors and capacitors. Additionally, the synchronous rectification improves efficiency and results in fewer external components. Over all load currents, the device uses a voltage regulating pulse-width modulation (PWM) mode that maintains a constant frequency with excellent stability and transient response. The ADP2125 is enabled by a 6 MHz to 27 MHz external clock signal applied to the EXTCLK pin. When the external clock is not switching and in a low state (EXTCLK ≤ 0.5 V), the input is disconnected from the output and draws less than 0.3 μA (typical) from the source. The ADP2125 has an input voltage range of 2.1 V to 5.5 V, allowing the use of single Li+/Li polymer cell, three-cell alkaline, NiMH cell, and other standard power sources. The ADP2125 is internally compensated to minimize external components and can source up to 500 mA. Other key features such as cycle-by-cycle peak current limit, soft start, undervoltage lockout (UVLO), output-to-ground short-circuit protection, and thermal shutdown provide protection for internal and external circuit components.

  • Mobile phones
  • Digital still/video cameras
  • Digital audio
  • Portable equipment
  • Camera modules
  • Image stabilization systems


  • 1.26 V fixed output voltage
  • Clock signal enable
  • 6 MHz (maximum) operating frequency
  • 500 mA continuous output current
  • Input voltage: 2.1 V to 5.5 V
  • 0.3 μA (typical) shutdown supply current
  • Compatible with tiny multilayer inductors
  • Internal synchronous rectifier
  • Internal compensation
  • Internal soft start
  • Output to ground short-circuit protection
  • Current-limit protection
  • See data sheet for additional features

Typical Application Circuit Diagram


Title Content Type File Type
ADP2125: Low Profile, 500 mA, 6 MHz, Synchronous,Step-Down, DC-to-DC Converter Data Sheet (Rev A, 05/2011) (pdf, 576 kB) Data Sheets 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
UG-198: Evaluating the ADP2125 Low Profile, 6 MHz, Step-Down Converter  (pdf, 114 kB) User Guides PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
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.

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Price, packaging, availability

ADP2125 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
ADP2125BCDZ-1.26R7 Status: Production BUMPED BARE DIE SALES 6 Ind Reel, 3000 - $0.80 Y  Material Info PCN Purchase Sample
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.

ADP2125 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
ADP2125B-1.26EVALZ 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.

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