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Switching Regulator - Switching Regulators 
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MAX1672
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
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Key Features
Applications/Uses
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
Technical Docs
| Data Sheet | Step-Up/Down DC-DC Converter in QSOP Package | Dec 10, 2002 |
Support & Training
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Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
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.
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.
Technical Docs
| Data Sheet | Step-Up/Down DC-DC Converter in QSOP Package | Dec 10, 2002 |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
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