1. Products
  2. Power Management
  3. Switching Regulators
  4. Step-Down (Buck) Regulators
  5. Internal Power Switch Buck Regulators
  6. ADP2106

Alternative Parts


Features and Benefits

  • Extremely high 97% efficiency
  • Ultralow quiescent current: 20 μA
  • 1.2 MHz switching frequency
  • 0.1 μA shutdown supply current
  • Maximum load current: 1.5 A
  • Input voltage: 2.7 V to 5.5 V
  • Output voltage: 0.8 V to VIN
  • Maximum duty cycle: 100%
  • Smoothly transitions into low dropout (LDO) mode
  • Internal synchronous rectifier
  • Small 16-lead 4 mm × 4 mm LFCSP package
  • Optimized for small ceramic output capacitors
  • Enable/shutdown logic input
  • Undervoltage lockout
  • Soft start
  • Supported by ADIsimPower™ design tool

Product Details

The ADP2105 / ADP2106 / ADP2107 are low quiescent current, synchronous, step-down dc-to-dc converters in a compact 4 mm × 4 mm LFCSP package. At medium to high load currents, these devices use a current mode, constant frequency pulse-width modulation (PWM) control scheme for excellent stability and transient response. To ensure the longest battery life in portable applications, the ADP2105 / ADP2106 / ADP2107 use a pulse frequency modulation (PFM) control scheme under light load conditions that reduces switching frequency to save power.

The ADP2105 / ADP2106 / ADP2107 run from input voltages of 2.7 V to 5.5 V, allowing single Li+/Li− polymer cell, multiple alkaline/NiMH cells, PCMCIA, and other standard power sources. The output voltage of ADP2105 / ADP2106 / ADP2107 is adjustable from 0.8 V to the input voltage (indicated by ADJ), whereas the ADP2105 / ADP2106 / ADP2107 are available in preset output voltage options of 3.3 V, 1.8 V, 1.5 V, and 1.2 V (indicated by x.x V). Each of these variations is available in three maximum current levels: 1 A (ADP2105), 1.5 A (ADP2106), and 2 A (ADP2107). The power switch and synchronous rectifier are integrated for minimal external part count and high efficiency. During logic controlled shutdown, the input is disconnected from the output, and it draws less than 0.1 µA from the input source. Other key features include undervoltage lockout to prevent deep battery discharge and programmable soft start to limit inrush current at startup.


  • Mobile handsets
  • PDAs and palmtop computers
  • Telecommunication/networking equipment
  • Set top boxes
  • Audio/video consumer electronics

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Tools & Simulations

Design Tools

ADP21xx Buck Regulator Design Tool

Microsoft Excel download tool from ADIsimPower to generate a power supply design complete with a schematic, bill of materials, and performance specifications.

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
ADP2106ACPZ-R7 Material Declaration Reliability Data 16-Lead LFCSP (4mm x 4mm x 0.85mm w/ EP)
Wafer Fabrication Data

PCN-PDN Information

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Sample & Buy

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Buy Now Pricing

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Evaluation Boards

Pricing displayed is based on 1-piece.

Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

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.