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Step-Up/Down DC-DC Converter in QSOP Package

Compact, Low-Noise, Transformerless Step-Up/Down Regulator with Single Small Inductor Has Low Output Ripple

Product Details

Key Features

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 1.8
VIN (V) (max) 11
VOUT1 (V) (min) 1.25
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 0.26
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Preset
Resistor
Power Good Signal Yes
# DC-DC Outputs 1
Package/Pins QSOP/16
Budgetary
Price (See Notes)
3.35
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 1.8
VIN (V) (max) 11
VOUT1 (V) (min) 1.25
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 0.26
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Preset
Resistor
Power Good Signal Yes
# DC-DC Outputs 1
Package/Pins QSOP/16
Budgetary
Price (See Notes)
3.35

Key Features

  • 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

Applications/Uses

  • 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

Description

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.

Simplified Block Diagram

MAX1672: Typical Operating Circuit MAX1672: Typical Operating Circuit Zoom icon

Technical Docs

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 .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.