Features and Benefits

  • Meets Stringent Automotive Quality and Reliability Requirements
    • +3.5V to +28V Input Voltage Range Allows Operation in "Cold Crank" Conditions
    • Tolerates Input-Voltage Transients to +42V
    • Enable-Pin Compatible from +3.3V Logic Level to +42V
    • 1A Minimum Output Current with Overcurrent Protection
    • -40°C to +125°C Automotive Temperature Range
    • AEC-Q100 Qualified
  • Increased Efficiency and Reduced BOM Cost and Board Space
    • Integrated High- and Low-Side FETs
    • Fixed Output Voltages (see the Selector Guide in the full data sheet and Contact the Factory for All Available Trimmed Output-Voltage Options)
    • 10-Pin TDFN-EP or 16-Pin TSSOP-EP Packages
  • Low Quiescent Current Helps Designers Meet Stringent OEM Current Requirements
    • 25µA Quiescent Current During Skip Mode Operation
  • High Switching Frequency Allows Use of Small, Low-Cost External Components
    • 2.1MHz Switching Frequency with Three Modes of Operation
    • Skip Mode for Efficient, Low-Power Operation
    • Forced Fixed-Frequency Operation
    • External Frequency Synchronization
  • Reduced EMI Emissions at the Switching Frequency
    • Optional Spread-Spectrum Frequency Modulation

Product Details

The MAX16903 is a small, synchronous buck converter with integrated high-side and low-side switches. The device is designed to deliver 1A with input voltages from +3.5V to +28V while using only 25µA quiescent current at no load. Voltage quality can be monitored by observing the PGOOD signal. The MAX16903 can operate in dropout by running at 97% duty cycle, making it ideal for automotive and industrial applications.

The MAX16903 operates at a 2.1MHz frequency, allowing for small external components and reduced output ripple. It guarantees no AM band interference. SYNC input programmability enables three frequency modes for optimized performance: forced fixed-frequency operation, skip mode (ultra-low quiescent current of 25µA), and synchronization to an external clock. The MAX16903 can be ordered with spread-spectrum frequency modulation, designed to minimize EMI-radiated emissions due to the modulation frequency.

The MAX16903 is available in a thermally enhanced, 3mm x 3mm, 10-pin TDFN package or a 16-pin TSSOP package. The MAX16903 operates over the -40°C to +125°C automotive temperature range.


  • Automotive
  • High-Voltage Input-Power DC-DC Applications
  • Industrial

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

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.



MAX16903 SIMPLIS Schematic

MAX16903 SIMPLIS Schematic

Product Recommendations

MAX16903 Companion Parts

Recommended Related Parts

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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