Features and Benefits

  • Low Input (0.7V) and Output (1.8V) Voltage Capability
  • Internal Synchronous Rectifier
  • High 94% Efficiency
  • Fixed Output Voltages: 1.8V, 2.5V, 3V, and 3.3V
  • Up to 2MHz Switching Allows Small External Components and Low Output Ripple
  • Automatic Pulse Skipping at Light Loads for Extended Battery Life
  • Low 70µA (typ) Operating Supply Current (Measured at OUT)
  • Low 2µA Logic-Controlled Shutdown
  • True Shutdown Fully Discharges Output to Ground
  • Uses Only Small Ceramic Capacitors
  • 75ms Active-Low RESET Output Flag

Product Details

The MAX1947 is a compact, high-efficiency, step-up DC-DC converter that regulates output voltages from 1.8V to 3.3V to power µP/DSP cores, memory, and I/O rails in 1-and 2-cell alkaline/NiMH/NiCd battery-powered systems. It features an internal 800mA switch and synchronous rectifier to achieve up to 94% efficiency and to eliminate the need for an external Schottky diode.

High-frequency switching (up to 2MHz) results in low ripple and small external components, while automatic pulse skipping at light loads reduces supply current to just 70µA for extended battery life. Maxim's proprietary True Shutdown™ reduces supply current to just 2µA and fully discharges the output to ground. The converter is offered in fixed-output voltages of 1.8V, 2.5V, 3.0V, and 3.3V, requiring no feedback or compensation network. A 75ms active-low RESET output flag provides for power-on reset (POR) and undervoltage detection. The MAX1947 is available in a space-saving 8-pin TDFN package.


  • Cordless Phones
  • Digital Still Cameras
  • MP3 Players, Pagers, and CD Players
  • Other Battery-Powered Systems
  • PDAs and Organizers
  • Portable Medical Equipment
  • Wireless Mice/Keyboards

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

MAX1947 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.

Sample & Buy

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Buy Now Pricing

(**) Displayed Buy Now Price and Price Range is based on small quantity orders.


List Pricing

(*)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.


Lead Times

Please see the latest communication from our CCO regarding lead times.



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