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General 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 exter

nal 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.

Features

?High-Voltage Operation (Up to 36V IN)

?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