Features and Benefits

  • Step-Up/Down Voltage Conversion
  • 1.8V to 11V Input Range
  • 3.3V/5V or Adjustable Output Voltage Range
  • Output Current:
    • 300mA at 5V (VIN > 2.5V)
    • 150mA at 5V (VIN > 1.8V)
  • Smaller Inductor than SEPIC and Flybacks
  • Load Disconnects from Input in Shutdown
  • Supply Current from Battery:
    • 85µA (No-Load)
    • 0.1µA (Shutdown)
  • PGI/PGO-bar Low-Battery Comparator
  • 16-Pin QSOP Package (Same Footprint as 8-pin SO)
  • No External FETs Required
  • Thermal and Short-Circuit Protection

Product Details

The MAX1672 integrates a step-up DC-DC converter with a linear regulator to provide step-up/down voltage conversion. This device provides a constant output voltage for inputs that vary above and below the output voltage. It has a 1.8V to 11V input range and a preset 3.3V or 5V output. The output can also be set from 1.25V to 5.5V using two resistors. Typical efficiency is 85%.

The MAX1672's step-up/linear-regulator configuration permits the use of a single, physically smaller inductor than can be used with competing SEPIC and flyback configurations. Switch current is also selectable, permitting the use of smaller inductors in low-current applications. The linear regulator also acts as a filter to reduce output ripple voltage.

The MAX1672 has a low 85µA quiescent supply current, which is further reduced to 0.1µA in logic-controlled shutdown. The output voltage is disconnected from the input in shutdown. The MAX1672 also has a PGI/PGO-bar low-battery detector.

The MAX1672 comes in a 16-pin QSOP package (same size as a standard 8-pin SO). For a larger device that delivers more output current, refer to the MAX710/MAX711. The preassembled MAX1672 evaluation kit is available to speed designs.


  • 2-Cell to 4-Cell AA Alkaline Handheld Equipment
  • 3.3V and Other Low-Voltage Systems
  • Battery-Powered Devices
  • Digital Cameras
  • Single-Cell, Lithium-Powered Portable Devices with AC Input Adapters

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.

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Product Recommendations

MAX1672 Companion Parts

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