Features and Benefits

  • 600mA Step-Down Converter
  • 60mΩ (typ) Bypass Mode with Integrated FET
  • Dynamically Adjustable Output from 0.4V to VIN
  • 2.5MHz and 1.5MHz Switching Frequency
  • Small LC Components: 1.5µH to 3.3µH and 2.2µF
  • Up to 94% Efficiency
  • Low Output Ripple at All Loads
  • 2.7V to 5.5V Input
  • 0.1µA Shutdown Mode
  • Output Short-Circuit Protection
  • Thermal Shutdown
  • 10-Pin, 3mm x 3mm TDFN Packages

Product Details

The MAX8581/MAX8582 high-frequency step-down converters are optimized for dynamically powering the power amplifier (PA) in CDMA handsets. They integrate a high-efficiency PWM step-down converter for medium- and low-power transmission and a 60mΩ (typ) bypass mode to power the PA directly from the battery during high-power transmission. They use an analog input driven by an external DAC to control the output voltage linearly for continuous PA power adjustment. The MAX8581/MAX8582 use an internal feedback network, and the switching frequency is internally set to 2.5MHz and 1.5MHz, respectively.

Fast switching (up to 2.5MHz) and fast soft-start allowthe use of ceramic 2.2µF input and output capacitors while maintaining low voltage ripple. The small 1.5µH to 3.3µH inductor size can be optimized for efficiency.

The MAX8581/MAX8582 are available in 10-pin, 3mm x3mm TDFN packages (0.8mm max height).


  • WCDMA/NCDMA Cell Phones
  • Wireless PDAs, Smartphones

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)

Product Recommendations

MAX8581 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.

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