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Regulated 3.3V Charge Pump

Compact, Inductorless, Low-Profile 3.3V Backup Supply Fits in 0.075 Sq. Inch

Product Details

Key Features

Simplified Block Diagram

Technical Docs

Data Sheet Regulated 3.3V Charge Pump Apr 01, 1997

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Key Features

  • Regulated 3.3V ±4% Output
  • Ultra-Small: 1.1mm-High, 8-Pin µMAX Package
  • No Inductors Required
  • Up to 1MHz Operation (small external components)
  • Fits into 0.05 in.²
  • Up to 85% Efficiency
  • 1.8V to 3.6V Input Voltage Range
  • 50µA Quiescent Supply Current
  • 1µA Shutdown Current
  • Only three small capacitors required

Applications/Uses

  • Backup Battery Boost Converters
  • Battery-Powered Applications
  • Miniature Equipment
  • Translators
  • Two-Way Paging

Description

The MAX679 step-up, regulated charge pump generates a 3.3V ±4% output voltage from a 1.8V to 3.6V input voltage (two alkaline, NiCd, or NiMH; or one Lithium-Ion battery). Output current is 20mA (min) from a 2.0V input. Only three external capacitors are needed to build a complete DC-DC converter.

The MAX679's switching frequency is pin selectable at 330kHz or 1MHz to allow trade-offs between lowest supply current and smallest-size capacitors. The logic shutdown function reduces the supply current to 5µA (max) and disconnects the load from the input. Special soft-start circuitry prevents excessive current from being drawn from the battery during start-up. This DC-DC converter requires no inductors and has low EMI. It is available in the ultra-small µMAX® package, which is only 1.11mm high and half the area of an 8-pin SO.

Simplified Block Diagram

MAX679: Typical Operating Circuit MAX679: Typical Operating Circuit Zoom icon

Technical Docs

Data Sheet Regulated 3.3V Charge Pump Apr 01, 1997

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .