MAX1745

MAX1744/MAX1745 19-1776; Rev 4; 8/09 EVAALVUAAILTAIOBNLEKIT High-Voltage, Step-Down DC-DC Controllers in µMAX 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 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. ________________________Applications Automotive Electronics Telecom Systems Wall-Cube-Powered Devices Industrial Control Systems Firewire®/IEEE® 1394 μMAX is a registered trademark of Maxim Integrated Products, Inc. Firewire is a registered trademark of Apple, Inc. IEEE is a registered service mark of the Institute of Electrical and Electronics Engineers, Inc. Typical Operating Circuit ____________________________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 ♦ Outp...