Features and Benefits

  • 3 A continuous output current
  • 75 mΩ and 40 mΩ integrated FET
  • ±1.5% output accuracy
  • Input voltage range from 2.3 V to 5.5 V
  • Output voltage from 0.6 V to VIN
  • 600 kHz or 1.2 MHz fixed switching frequency
  • Synchronizable between 600 kHz and 1.4 MHz
  • Selectable synchronize phase shift: 0° or 180°
  • Selectable PWM or PFM mode operation
  • Current mode architecture
  • Precision enable input
  • Power good output
  • Voltage tracking input
  • Integrated soft start
  • Internal compensation
  • Starts up into a precharged output
  • UVLO, OVP, OCP, and thermal shutdown
  • Available in 16-lead, 4 mm × 4 mm LFCSP package
  • Supported by ADIsimPower design tool

Product Details

The ADP2118 is a low quiescent current, synchronous, step-down dc-to-dc regulator in a compact 4mm × 4mm LFCSP package. It uses a current mode, constant frequency pulse-width modulation (PWM) control scheme for excellent stability and transient response. Under light loads, the ADP2118 can be configured to operate in pulse frequency modulation (PFM) mode that reduces switching frequency to save power.

The ADP2118 runs from input voltages of 2.3 V to 5.5 V. The output voltage of the ADP2118ACPZ-R7 is adjustable from 0.6 V to input voltage (VIN), and the ADP2118ACPZ-x.x-R7 are available in preset output voltage options of 1.2 V and 3.3 V. The ADP2118 requires minimal external parts and provides a high efficiency solution with its integrated power switch, synchronous rectifier, and internal compensation. The IC draws less than 3 μA from the input source when it is disabled. Other key features include undervoltage lockout (UVLO), integrated soft start to limit inrush current at startup, overvoltage protection (OVP), overcurrent protection (OCP), and thermal shutdown (TSD).


  • Point of load conversion
  • Communications and networking equipments
  • Industrial and instrumentation
  • Consumer electronics
  • Medical appliances

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


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Models for the following parts are available in LTspice:


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

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Evaluation Boards

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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.