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Switching Regulators 
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MAX1745
High-Voltage, Step-Down DC-DC Controller in µMAX
High-Voltage (36V) Step-Down DC-DC Controller in µMAX
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Key Features
Applications/Uses
Parametric specs for Step-Down Switching Regulators
| VIN (V) (min) | 4.5 |
| VIN (V) (max) | 36 |
| VOUT1 (V) (min) | 1.25 |
| VOUT1 (V) (max) | 18 |
| IOUT1 (A) (max) | 10 |
| Switch Type | External |
| Output Adjust. Method | Resistor |
| # DC-DC Outputs | 1 |
| Switching Frequency (kHz) | 330 |
| Package/Pins | UMAX/10 |
| Budgetary Price (See Notes) | 3.32 |
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Simplified Block Diagram
Technical Docs
| Data Sheet | High-Voltage, Step-Down DC-DC Controller in µMAX | Feb 10, 2010 | |
| App Note | Turn-On Switching Loss of An Asynchronous Buck Converter | ||
| App Note | Choosing the Right DC-DC Converter for Automotive Applications |
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 .
Parameters
Parametric specs for Step-Down Switching Regulators
| VIN (V) (min) | 4.5 |
| VIN (V) (max) | 36 |
| VOUT1 (V) (min) | 1.25 |
| VOUT1 (V) (max) | 18 |
| IOUT1 (A) (max) | 10 |
| Switch Type | External |
| Output Adjust. Method | Resistor |
| # DC-DC Outputs | 1 |
| Switching Frequency (kHz) | 330 |
| Package/Pins | UMAX/10 |
| Budgetary Price (See Notes) | 3.32 |
Key Features
- High-Voltage Operation (up to 36VIN)
- Efficiency > 90%
- Output Power Capability Exceeds 50W
- 10-Pin µMax Package
- Low-Dropout Voltage
- 100% (max) Duty Cycle
- 90µA Quiescent Current
- 4µA Shutdown Current
- Up to 330kHz Switching Frequency
- Output Voltage
- 5V or 3.3V (MAX1744)
- Adjustable 1.25V to 18V (MAX1745)
- Current-Limited Control Scheme
Applications/Uses
- Automotive Electronics
- FireWire®/IEEE® 1394
- Industrial Control Systems
- Telecom Systems
- Wall-Cube-Powered Devices
Description
The MAX1744/MAX1745 are step-down DC-DC controllers capable of handling up to 36V inputs. These parts use a proprietary current-limited control scheme for excellent light- and full-load efficiency, while their 330kHz (max) switching frequency permits small external components for space-critical applications. Operation to 100% duty cycle permits the lowest possible dropout voltage.
The MAX1744 contains an internal feedback network that provides a pin-selectable output voltage of either 3.3V or 5V. The MAX1745 uses an external feedback network to generate an adjustable output voltage between 1.25V and 18V.
The MAX1744/MAX1745 are available in a space-saving 10-pin µMAX® package.
The MAX1744 contains an internal feedback network that provides a pin-selectable output voltage of either 3.3V or 5V. The MAX1745 uses an external feedback network to generate an adjustable output voltage between 1.25V and 18V.
The MAX1744/MAX1745 are available in a space-saving 10-pin µMAX® package.
Technical Docs
| Data Sheet | High-Voltage, Step-Down DC-DC Controller in µMAX | Feb 10, 2010 | |
| App Note | Turn-On Switching Loss of An Asynchronous Buck Converter | ||
| App Note | Choosing the Right DC-DC Converter for Automotive Applications |
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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