1. Products
  2. Power Management
  3. Switching Regulators
  4. Step-Down (Buck) Regulators
  5. Internal Power Switch Buck Regulators
  6. MAX5090A


Features and Benefits

  • Wide Input Voltage Range: 6.5V to 76V
  • Fixed (3.3V, 5V) and Adjustable (1.265V to 11V) Output-Voltage Versions
  • 2A Output Current
  • Efficiency Up to 92%
  • Internal 0.26Ω High-Side DMOS FET
  • 310µA Quiescent Current at No Load
  • 19µA Shutdown Current
  • Internal Frequency Compensation
  • Fixed 127kHz Switching Frequency
  • External Frequency Synchronization
  • Thermal Shutdown and Short-Circuit Current Limit
  • -40°C to +125°C Automotive Temperature Range
  • 16-Pin (5mm x 5mm) Thin QFN Package
  • Capable of dissipating 2.67W at +70°C

Product Details

The MAX5090A/B/C easy-to-use, high-efficiency, high-voltage step-down DC-DC converters operate from an input voltage up to 76V, and consume only 310µA quiescent current at no load. This pulse-width-modulated (PWM) converter operates at a fixed 127kHz switching frequency at heavy loads, and automatically switches to pulse-skipping mode to provide low quiescent current and high efficiency at light loads. The MAX5090 includes internal frequency compensation simplifying circuit implementation. The device can also be synchronized with external system clock frequency in a noise-sensitive application. The MAX5090 uses an internal low on-resistance and a high-voltage DMOS transistor to obtain high efficiency and reduce overall system cost. This device includes undervoltage lockout, cycle-by-cycle current limit, hiccup-mode output short-circuit protection, and overtemperature shutdown.

The MAX5090 delivers up to 2A output current. External shutdown is included, featuring 19µA (typ) shutdown current. The MAX5090A/MAX5090B versions have fixed output voltages of 3.3V and 5V, respectively, while the MAX5090C features an adjustable 1.265V to 11V output voltage.

The MAX5090 is available in a space-saving 16-pin thin QFN package (5mm x 5mm) and operates over the automotive temperature range (-40°C to +125°C).


  • Distributed Power
  • 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.

Product Recommendations

MAX5090A 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.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
MAX5090AATE+ Material Declaration Reliability Data 16-LFCSP-5X5X0.75
MAX5090AATE+T Material Declaration Reliability Data 16-LFCSP-5X5X0.75
Wafer Fabrication Data

Sample & Buy

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