1. Products
  2. Power Management
  3. Switching Regulators
  4. Step-Down (Buck) Regulators
  5. Internal Power Switch Buck Regulators
  6. MAX20429


Features and Benefits

  • High-Feature Set in an Ultra-Small Footprint
    • High-Efficiency DC-DC Converter
    • Two Independent Outputs, up to 6A per Output
    • 3.0V to 5.5V Operating Supply Voltage
    • Resistor-Adjustable Output Voltage
    • Optional Factory-Preset Output Voltage
    • 2.1MHz/3.2MHz Options
    • Enable Input
    • Individual Active-Low RESET Outputs
    • Spread-Spectrum Option
    • Peak Current-Mode Architecture
    • 3mm x 3.5mm FCQFN
  • High-Precision
    • 108/92% OV/UV Monitor
    • ±3% OV/UV Accuracy
    • ±1% Output Voltage Accuracy
    • Excellent Load-Transient Performance
    • PWM and SKIP Mode Operation
    • MAXQTM Power Architecture
  • High Efficiency
    • Up to 96% Efficiency 5V to 3.3V
    • Up to 90% Efficiency 5V to 1V
  • -40°C to +125°C Operating Temperature Range
  • AEC-Q100 Qualified

Product Details

The MAX20429 is a high-efficiency dual switching regulator that delivers up to 6A (peak) load current per output from 0.5V to 1.5875V in 12.5mV steps and 1.6V to 3.8V in 50mV steps. The IC operates from 3V to 5.5V, making it ideal for on-board point-of-load and post-regulation applications. Total output error is less than ±1.0% over load, line, and temperature.

The MAX20429 features fixed-frequency PWM mode operation with a switching frequency of 2.1MHz or 3.2MHz. High-frequency operation allows for an all-ceramic capacitor design with small external components.

The low-resistance on-chip switches ensure high efficiency at heavy loads while minimizing critical inductances, making the layout a much simpler task with respect to discrete solutions. Following a simple layout and footprint ensures first-pass success in new designs.

The device features the MAXQ™ technology, which provides precision transient performance and phase margin. This allows obtaining the maximum power, performance, and precision from the converter over a very wide range of configurations.

The MAX20429 has separate enable inputs and status outputs for each buck converter. The output voltage is preset at the factory to allow customers to achieve ±1% output-voltage accuracy without using expensive 0.1% resistors. The devices offer factory programmable soft-start and active-low RESET times.

The devices include over-temperature shutdown and overcurrent limiting. All devices are designed to operate from –40°C to +125°C ambient temperature range.


  • Secondary Regulator for SoC / MCU Supply

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.


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
MAX20429AAFNA/VY+ Material Declaration Reliability Data 18L, FC2QFN Package (3mm x 3.5mm x 0.75mm)
MAX20429AAFNA/VY+T Material Declaration Reliability Data 18L, FC2QFN Package (3mm x 3.5mm x 0.75mm)
MAX20429CAFNA/VY+ Material Declaration Reliability Data 18L, FC2QFN Package (3mm x 3.5mm x 0.75mm)
MAX20429CAFNA/VY+T Material Declaration Reliability Data 18L, FC2QFN Package (3mm x 3.5mm x 0.75mm)
Wafer Fabrication Data MAX20429 Reliability Data

Sample & Buy

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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.