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MAX1744 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX1744 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 15 page General Description The MAX1744/MAX1745 are step-down DC-DC con- trollers 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 possi- ble 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-sav- ing 10-pin μMAX® package. ________________________Applications Automotive Electronics Telecom Systems Wall-Cube-Powered Devices Industrial Control Systems Firewire®/IEEE® 1394 ____________________________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 High-Voltage, Step-Down DC-DC Controllers in µMAX ________________________________________________________________ Maxim Integrated Products 1 19-1776; Rev 4; 8/09 Ordering Information PART TEMP RANGE PIN-PACKAGE MAX1744EUB+ -40 °C to +85°C 10 μMAX MAX1744AUB+ -40 °C to +125°C 10 μMAX MAX1744EUB/V+ -40 °C to +85°C 10 μMAX MAX1745EUB+ -40 °C to +85°C 10 μMAX MAX1745AUB+ -40 °C to +125°C 10 μMAX MAX1745EUB/V+ -40 °C to +85°C 10 μMAX GND OUT REF VL CS MAX1744 3/5 5V 3.3V ON OFF SHDN IN VH EXT P IN 4.5V TO 36V OUT 3.3V OR 5V Typical Operating Circuit 1 + 2 3 4 5 10 9 8 7 6 IN EXT VH 3/5 (FB) ( ) ARE FOR MAX1745 ONLY. REF VL GND MAX1744 MAX1745 μMAX TOP VIEW CS OUT SHDN Pin Configuration For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. EVALUATION KIT AVAILABLE 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. + Denotes a lead(Pb)-free/RoHS-compliant package. /V Denotes an automotive qualified part. |
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