Features and Benefits

  • Multiple Functions for Small Size
    • Operating Input Voltage Range: 3V to 36V
    • Synchronous DC-DC Converter with Integrated FETs up to 2.5A/3.5A
    • 10μA Quiescent Current in Skip Mode
    • 3MHz/2.1MHz/400kHz Switching Frequency
    • Spread-Spectrum Option
    • Fixed 2.5ms Internal Soft-Start
    • Programmable 0.8V to 12V Output Voltage Range or Fixed 5V/3.3V Options Available
    • 99% Duty Cycle Operation with Low Dropout
  • High Precision for Safety Critical Applications
    • ±1.5% Output Voltage Accuracy in FPWM
    • Precision Enable Thresholds for Fully Programmable UVLO Thresholds
    • Accurate Windowed PGOOD
  • Robust for the Automotive Environment
    • Average Current Mode, Forced-PWM, and Skip Operation
    • Overtemperature, Overvoltage, and Short-Circuit Protection
    • 3mm x 3mm FC2QFN
    • -40°C to +125°C Operating Temperature Range
    • 42V Load-Dump Tolerant
    • AEC-Q100 Qualified

Product Details

The MAX20402/MAX20403 IC are tiny synchronous buck converters with integrated high-side and low-side switches. The MAX20402/MAX20403 deliver up to 2.5A/3.5A over a wide 3V to 36V input voltage range. Voltage quality can be monitored by observing the PGOOD signal. These ICs can operate in dropout by running at 99% duty cycle, making them ideal for automotive and industrial applications.

The MAX20402/MAX20403 offer externally programmable or internally fixed output voltages of 5V and 3.3V. Fixed internal frequency options of 3MHz/2.1MHz/400kHz are available, which allow for small external components and reduced output ripple, and also guarantee no AM interference.

When SYNC is low, the MAX20402/MAX20403 automatically enter skip mode at light loads with an ultra-low quiescent current of 10μA at no load. A pin-selectable forced-PWM mode is also available, which helps improve EMI performance. The devices have a spread-spectrum frequency modulation option designed to minimize EMI-radiated emissions due to the modulation frequency.

The MAX20402/MAX20403 are available in a small, 3mm x 3mm FC2QFN package and use very few external components.


  • Automotive Applications
    • ADAS Systems
    • Radar Modules
    • Infotainment
  • Industrial Applications
  • High-Voltage DC-DC Converters

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.

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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(*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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