Features and Benefits

  • Meets Stringent Automotive Quality and Reliability Requirements
    • 2V to 36V Operating VIN Allows Operation in Cold-Crank Conditions
    • Tolerates Input Transients Up to 40V
    • EN Pin Compatible from 3.3V to 40V
    • 0.6A (max) Output Current (MAX20039)
    • 1.2A (max) Output Current (MAX20040)
    • -40°C to +125°C Automotive Temperature Range
    • AEQ-100
    • Increased Efficiency with Reduced BOM Cost and Board Space
    • Integrated FETs H-Bridge Architecture
    • Fixed Output Voltages
    • 20-Pin SWTQFN Package
  • Low Quiescent Current Helps Designers Meet Stringent OEM Current Requirements (B and D Version only)
    • 52µA Quiescent Current when in Standby Mode
    • 10µA (max) Quiescent Current in Shutdown Mode
  • High Switching Frequency Allows Use of Small External Components
    • 200kHz to 2.2MHz Operating Frequency
    • Skip Mode for Efficient Low-Power Operation (B and D version only)
    • Fixed-Frequency PWM Mode
    • External Frequency Synchronization
  • Reduced EMI Emissions at the Switching Frequency
    • Spread Spectrum Can be Enabled or Disabled

Product Details

The MAX20039/MAX20040 ICs are a small, synchronous buck-boost converter family with integrated high-side and low-side switches. The MAX20040 is designed to deliver up to 1.2A with input voltages from 2V to 36V while using only 52µA quiescent current at no load. The ICs provide an accurate output voltage of ±2%. Voltage quality can be monitored by observing the PGOOD signal.

The MAX20039/MAX20040 offer a fixed output voltage of 5V and a programmable range of 4.0V to 15V. See the Ordering Information table for more details. Frequency is adjustable from 220kHz to 2.2MHz, which allows for small external components, reduced output ripple, and guarantees no AM interference. Skip mode with low quiescent current of 52µA is available in the MAX20040B and MAX20040D versions of the IC. The ICs can operate with spread-spectrum frequency modulation designed to minimize EMI-radiated emissions due to the modulation frequency.

The MAX20039/MAX20040 are available in a small (4mm x 4mm), 20-pin, side-wettable TQFN package and use very few external components.


  • Body Electronics
  • Infotainment Systems
  • Point-of-Load (POL) Power Supply
  • Power over Coax (POC)
  • Start-Stop Systems

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 (1)

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.

PCN-PDN Information

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Evaluation Boards

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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.