1. Products
  2. Power Management
  3. Switching Regulators
  4. Step-Down (Buck) Regulators
  5. Internal Power Switch Buck Regulators
  6. ADP2125


Features and Benefits

  • 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

Product Details

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

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (1)

Design Resources

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 Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
ADP2125BCDZ-1.26R7 Material Declaration Reliability Data BUMPED BARE DIE SALES
Wafer Fabrication Data

PCN-PDN Information

Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.

Sample & Buy

Ordering FAQs

See our Ordering FAQs for answers to questions about online orders, payment options and more.


Buy Now Pricing

(**) Displayed Buy Now Price and Price Range is based on small quantity orders.


List Pricing

(*)The 1Ku 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. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


Lead Times

Please see the latest communication from our CCO regarding lead times.



Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.

Price Table Help