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MAX1745 Dataheets PDF



Part Number MAX1745
Manufacturers Maxim
Logo Maxim
Description High-Voltage / Step-Down DC-DC Controller
Datasheet MAX1745 DatasheetMAX1745 Datasheet (PDF)

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 .

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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 ♦ Output Voltage 5V or 3.3V (MAX1744) Adjustable 1.25V to 18V (MAX1745) ♦ Current-Limited Control Scheme 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 +Denotes a lead(Pb)-free/RoHS-compliant package. /V Denotes an automotive qualified part. Pin Configuration IN 4.5V TO 36V TOP VIEW ON IN VH EXT OFF SHDN 5V 3.3V 3/5 MAX1744 VL REF CS GND OUT P OUT 3.3V OR 5V + GND 1 VL 2 REF 3 3/5 (FB) 4 MAX1744 MAX1745 OUT 5 ( ) ARE FOR MAX1745 ONLY. μMAX 10 IN 9 EXT 8 VH 7 SHDN 6 CS ________________________________________________________________ Maxim Integrated Products 1 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. MAX1744/MAX1745 High-Voltage, Step-Down DC-DC Controllers in µMAX ABSOLUTE MAXIMUM RATINGS IN, EXT, SHDN to GND...........................................-0.3V to +38V VH to GND..............................................................-0.3V to +34V VH, EXT to IN............................................................-7V to +0.3V CS, OUT to GND ....................................................-0.3V to +20V FB, 3/5, REF to GND .....................................-0.3V to (VL + 0.3V) VL to GND......................................


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