1. Products
  2. Power Management
  3. Switching Regulators
  4. Step-Down (Buck) Regulators
  5. Internal Power Switch Buck Regulators
  6. MAX38642


Features and Benefits

  • Extends Battery Life
    • 330nA Ultra-Low Quiescent Supply Current
    • 5nA Shutdown Current
    • 96% Peak Efficiency and over 88% at 10μA
  • Easy to Use – Addresses Popular Operation
    • 1.8V to 5.5V Input Range
    • Single Resistor-Adjustable VOUT from 0.7V to 3.3V (A-Option)
    • Preprogrammed VOUT from 0.5V to 5.0V (B-Option)
    • ±1.75% Output Voltage Accuracy
    • Up to 175mA/350mA/700mA Load Current
  • Protects System in Multiple Use Cases
    • Reverse-Current Blocking in Shutdown
    • Optional Active Discharge Feature
  • Reduces Size and Increases Reliability
    • -40°C to +85°C Temperature Range
    • 2mm x 2mm 6-pin µDFN Package
    • 1.42mm x 0.89mm, 0.4mm Pitch 6-pin (2 x 3) WLP

Product Details

The MAX38640–MAX38643 are nanoPower family of ultra-low 330nA quiescent current buck (step-down) DC-DC converters that operate from 1.8V to 5.5V input voltage and support load currents of up to 175mA, 350mA, 700mA with peak efficiencies of 96%. While in shutdown, there is only 5nA of shutdown current. The devices offer ultra-low quiescent current, small total solution size, and high efficiency throughout the load range. The MAX38640–MAX38643 are ideal for battery applications where long battery life is a must.

The MAX38640–MAX38643 family utilizes a unique control scheme that allows ultra-low quiescent current and high efficiency over a wide output current range. The MAX38642 excludes active discharge resistor in shutdown which allows the output to be regulated or held high by another source or by the charged output capacitor.

The MAX38640–MAX38643 devices are offered in a space-saving 1.42mm x 0.89mm 6-pin WLP (2 x 3 bump, 0.4mm pitch), as well as a 2mm x 2mm, 6-pin µDFN package. All parts are specified over the -40°C to +85°C extended temperature range.


  • Portable, Space-Constrained Consumer Products
  • Single Li-ion (Li+) and Coin Cell Battery Products
  • Wearable Devices, Ultra-Low-Power IoT, NB IoT, and Bluetooth® LE
  • Wired or Wireless Industrial Products

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 (10)

Tools & Simulations

EE-Sim® Power Tools

The EE-Sim DC-DC Converter Tool uses your requirements to quickly create a complete power design including a schematic, BOM with commercially available parts, and time and frequency domain simulations. Your customized schematic can be downloaded for further analysis in the standalone EE-Sim OASIS Simulator, featuring SIMPLIS and SIMetrix SPICE engines.


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
MAX38642AELT+ Material Declaration Reliability Data 6-LFCSP-2X2X0.75
MAX38642AELT+T Material Declaration Reliability Data 6-LFCSP-2X2X0.75
MAX38642AENT+ Material Declaration Reliability Data 6-WLCSP-N/A
MAX38642AENT+T Material Declaration Reliability Data 6-WLCSP-N/A
Wafer Fabrication Data

Sample & Buy

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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.