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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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Status
Active: In Production.

Description
FULL DATA SHEET (PDF, 272kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail
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.

An evaluation kit is available:  MAX1744EVKIT, MAX1745EVKIT  

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:  Step-Down Switching Regulators
Part Number VIN
(V)
VIN
(V)
VOUT
(V)
VOUT
(V)
Preset VOUT
(V)
Max. IOUT
(A)
Max. IOUT
(A)
Output Adjust. Method DC-DC Outputs Oper. Freq.
(kHz)
Package/Pins Smallest Available Pckg.
(mm2)
Price
min max min max max w/pins See Notes
MAX1744  4.5 36 3.3 5
3.3
5
10 10
Preset
Resistor
1 330
µMAX/10
15.4 $2.75 @1k
MAX1745  1.25 18 - Resistor
µMAX/10
$2.75 @1k
See All Step-Down Switching Regulators (264)

Diagram
MAX1744, MAX1745: Typical Operating Circuit
Typical Operating Circuit

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    Document Ref.: 19-1776; Rev 3; 2009-07-16
    This page last modified: 2009-07-16


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