Maxim and Analog Devices Inc.’s two miniature converters, the MAX20402 / MAX20403 ICs, are designed with high-side and low-side switches. The pair delivers up to 2.5 A and 3.5 A respectively and does so over a wide input voltage range from 3 V to 36 V. Voltage quality can be monitored by monitoring the PGOOD signal. Both ICs are fail-safe, operating at 99% duty cycle, making them ideal for automotive and industrial applications

The MAX20402/MAX20403 are externally programmable or have internally fixed output voltages from 5V to 3.3V. Fixed internal frequency options of 3MHz/2.1MHz/400kHz are available. This allows for small external components and also ensures no AM interference and reduced output ripple.

When SYNC is low, the MAX20402/MAX20403 automatically enter skip mode under light loads. Then at idle an ultra low quiescent current of 10µA. To help improve anti-EMI performance, a pin-selectable forced PWM mode is available. The devices are designed to minimize radiated EMI emissions through a spread spectrum frequency modulation option when testing a modulation frequency.

Both MAX20402/MAX20403 models are available in 3 mm x 3 mm FC2QFN packages and use only a sparse number of external components.

Lots of features in a small form factor

  • Operating input voltage range – 3V to 36V
  • Synchronous DC-DC converter with integrated FETs up to 2.5 A/3.5 A
  • 10µA quiescent current in forward mode
  • Extended spectrum option
  • Programmable output voltage from 0.8V to 12V or fixed 5V/3.3V option available
  • 99% duty cycle with low dropout
  • Switching frequency 3MHz/2.1MHz/400kHz
  • Fixed internal soft start of 2.5ms

Safety critical applications with high accuracy

  • ±1.5% output voltage accuracy in FPWM
  • Fully programmable UVLO thresholds from Precision Enable Thresholds
  • PGOOD Accurate window

Automotive environment

  • Forced PWM, average current mode, skip operation
  • Short circuit protection, overheat and overvoltage protection
  • 3mmx3mm FC2QFN
  • -40°C to +125°C Operating Temp
  • 42V Load resistance
  • AEC-Q100 qualified

Other applications

  • Automotive applications
  • ADAS systems
  • Radar modules
  • Infotainment
  • Industrial
  • High voltage DC-DC converters

For more information on Analog Devices Inc. MAX20402/MAX20403, IC Buck Converters see product page on Maxim’s website.

Maxim Integrated |

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For the past 8 years, I have been writing about embedded technologies, adding to my technical, academic and medical editorial experience, with companies such as Elsevier and Cambridge University Press. I tell people to read what I write, not try to pronounce my last name. I’m always available for comments and suggestions, you can reach me at and I promise I’ll make time to get back to you. I live in the North East with my lovely family.

Maxim’s Tiny Buck Converters are Ready for Automotive Applications

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