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

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

Product Details

Key Features

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 36
VOUT1 (V) (min) 1.25
VOUT1 (V) (max) 18
IOUT1 (A) (max) 10
Switch Type External
Output Adjust. Method Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 330
Package/Pins UMAX/10
Budgetary
Price (See Notes)
3.52
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 36
VOUT1 (V) (min) 1.25
VOUT1 (V) (max) 18
IOUT1 (A) (max) 10
Switch Type External
Output Adjust. Method Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 330
Package/Pins UMAX/10
Budgetary
Price (See Notes)
3.52

Key Features

  • 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

Applications/Uses

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

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.

Simplified Block Diagram

MAX1744, MAX1745: Typical Operating Circuit MAX1744, MAX1745: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .