Features and Benefits

  • 0.87V Guaranteed Start-Up
  • Up to 90% Efficiency
  • Built-In Synchronous Rectifier (no external diode)
  • Ultra-Small µMAX Package, 1.1mm High
  • 37µA Quiescent Current (85µA from 1.5V battery)
  • 2µA Logic-Controlled Shutdown
  • Power-Fail Detector
  • Dual Mode™ Output: Fixed 3.3V
  • Dual Mode Adjustable 2V to 5.5V
  • 45mA Output Current at 3.3V for 1-Cell Input
  • 90mA Output Current at 3.3V for 2-Cell Input
  • Inductor-Damping Switch Suppresses EMI

Product Details

The MAX1678 is a high-efficiency, low-voltage, synchronous-rectified, step-up DC-DC converter intended for use in devices powered by 1 to 3-cell alkaline, NiMH, or NiCd batteries or a 1-cell lithium battery. It guarantees a 0.87V start-up voltage and features a low 37µA quiescent supply current.

The device includes a 1Ω, N-channel MOSFET power switch, a synchronous rectifier that acts as the catch diode, a reference, pulse-frequency-modulation (PFM) control circuitry, and circuitry to reduce inductor ringing-all in an ultra-small, 1.1mm-high µMAX® package.

The output voltage is preset to 3.3V or can be adjusted from +2V to +5.5V using only two resistors. Efficiencies up to 90% are achieved for loads up to 50mA. The device also features an independent undervoltage comparator (PFI/PFO) and a logic-controlled 2µA shutdown mode.


  • Pagers
  • Personal Medical Monitors
  • Pointing Devices
  • Remote Controls
  • Single-Cell Battery-Powered Devices

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.

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.

PCN-PDN Information

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Buy Now Pricing

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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

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