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MAX1744, MAX1745
High-Voltage, Step-Down DC-DC Controller in µMAX

High-Voltage (36V) Step-Down DC-DC Controller in µMAX


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Description
FULL DATA SHEET (PDF, 304kB)
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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.

Key Features   Applications/Uses
  • High-Voltage Operation (up to 36VIN)
  • 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

 
  • Automotive Electronics
  • FireWire®/IEEE 1394™
  • Industrial Control Systems
  • Telecom Systems
  • Wall-Cube-Powered Devices

    Key Specifications:   Switch-Mode DC-DC Power Supplies
    Part Number Topology VIN (min) (V) VIN (max) (V) Number of DC-DC Outputs Preset VOUT (V) Digital/VID Programmed Output Min. Adjustable VOUT (V) Max. Adjustable VOUT (V) IOUT (A) Operating Current, ICC (max) (mA) Fixed Freq/PWM Operation Operating Freq. (kHz) Internal Power Switch(es) Synchronous Rectifier Industry Qualified
    MAX1744  Step-Down 4.5 36 1 3.3 No  -   -  10 0.14 No 330 No No  - 
    MAX1745   -  1.25 18 Automotive - General
    See All Switch-Mode DC-DC Power Supplies (418)

    Diagram
    MAX1744, MAX1745: Typical Operating Circuit
    Typical Operating Circuit

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    Document Ref.: 19-1776; Rev 2; 2006-09-08
    This page last modified: 2008-02-04




             


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