Alternative Parts


Features and Benefits

  • Input voltage range: 2.7 V to 5.5 V
  • 600 mA maximum load current
  • 95% efficiency
  • Low duty cycle operation
  • Only 3 tiny external ceramic components
  • 3 MHz typical operating frequency
  • Fixed output voltage of 1.2 V or 1.375 V
  • Adjustable output voltage up to 3.3 V
  • 0.01 µA shutdown supply current
  • Automatic power save mode
  • Internal synchronous rectifier
  • Internal soft start
  • Internal compensation
  • Enable/shutdown logic input
  • Undervoltage lockout
  • Current limit protection
  • Thermal shutdown
  • Small 8-lead, 3 mm × 3 mm LFCSP

Product Details

The ADP2102 is a synchronous step-down dc-to-dc converter that converts a 2.7 V to 5.5 V unregulated input voltage to a lower regulated output voltage with up to 95% efficiency and 1% accuracy. The low duty cycle capability of the ADP2102 is ideal for USB applications or 5 V systems that power up submicron subvolt processor cores. Its 3 MHz typical operating frequency and excel-lent transient response allow the use of small, low cost 1 μH inductors and 2.2 μF ceramic capacitors. At medium-to-high load currents, it uses a current mode, pseudofixed frequency pulse-width modulation to extend battery life. To ensure the longest battery life in portable applications, the ADP2102 has a power save mode (PSM) that reduces the switching frequency under light load conditions to significantly reduce quiescent current.

The ADP2102 is available in both fixed and adjustable output voltage options with 600 mA maximum output current. The preset output voltage options voltage are 1.875 V, 1.8 V, 1.5 V, 1.375 V, 1.25 V, 1.2 V, 1.0 V, and 0.8 V. The adjustable voltage option is available from 0.8 V to 3.3 V. The ADP2102 requires only three external components and consumes 0.01 μA in shutdown mode.

The ADP2102 is available in an 8-lead LFCSP package and is specified for the −40 °C to +85 °C temperature range.


  • USB powered devices
  • WLAN and gateways
  • Point of loads
  • Processor core power from 5 V
  • Digital cameras
  • PDAs and palmtop computers
  • Portable media players, GPS

Product Lifecycle icon-not-recommended Not Recommended for New Designs

This designates products ADI does not recommend broadly for new designs.

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.