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