Features and Benefits

  • Continuous output current: 5 A
  • Integrated MOSFET
    • High-side on resistance: 19 mΩ
    • Low-side on resistance: 15 mΩ
  • Reference voltage: 0.6 V ± 1% over temperature range
  • Input voltage range: 2.7 V to 5.5 V
  • Current mode architecture
  • Switching frequency
    • Fixed frequency: 620 kHz or 1.2 MHz
    • Adjustable frequency: 250 kHz to 1.4 MHz
  • Synchronizes to external clock: 250 kHz to 1.4 MHz
  • Selectable synchronize phase shift: in phase or out of phase
  • External compensation
  • Programmable soft start
  • Startup into a precharged output
  • Voltage tracking input
  • Power-good output and precision enable input
  • Accurate current limit
  • Available in 24-lead, 4 mm × 4 mm LFCSP package
  • Supported by ADIsimPower™ design tool

Product Details

The ADP2165/ADP2166 are high efficiency, current mode control, step-down dc-to-dc regulators with an integrated 19 mΩ high-side FET and a 15 mΩ synchronous rectified FET. The ADP2165/ADP2166 combine a small size, 4 mm × 4 mm LFCSP package with an accurate current limit, resulting in a smaller inductor size and a high power density, point of load solution.

Key features include precision enable, power-good monitor, and output voltage tracking to facilitate robust sequencing. The switching frequency can be programmed from 250 kHz to 1.4 MHz, or it can be fixed at 620 kHz or 1.2 MHz. The synchronization function allows the switching frequency to synchronize to an external clock, minimizing the electromagnetic interference (EMI) of the system.

The ADP2165/ADP2166 are designed to be extremely flexible with the addition of a minimal amount of external components to program soft start and control loop compensation.

he ADP2165/ADP2166 are supplied from an input voltage of 2.7 V to 5.5 V. Output voltage options include 3.3 V, 2.5 V, 1.8 V, 1.5 V, 1.2 V, or 1.0 V fixed outputs and adjustable options capable of supporting an output voltage range from 0.6 V to 90% of the input voltage. Protection features include undervoltage lockout (UVLO), overvoltage protection (OVP), overcurrent protection (OCP), and thermal shutdown (TSD) for robust performance.

The ADP2165/ADP2166 operate over the −40°C to +125°C junction temperature range and are available in a 24-lead LFCSP package.


  • Point of load regulation
  • Communications and networking
  • High end consumer
  • Industrial, instrumentation, and healthcare

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 (2)

Tools & Simulations


LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.


Models for the following parts are available in LTspice:


Design Tools

ADP2165/ADP2166 Buck Designer 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.

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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.