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FULL DATA SHEET (PDF, 304kB) Download   E-Mail 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.

Key Features		Applications/Uses
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		Automotive Electronics FireWire®/IEEE 1394™ Industrial Control Systems Telecom Systems Wall-Cube-Powered Devices

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Typical Operating Circuit

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