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Low-Cost Voltage-Mode PWM Step-Down Controllers

Product Details

The MAX1966/MAX1967 are voltage-mode pulse-width-modulated (PWM), step-down DC-DC controllers that are ideal for a variety of cost-sensitive applications. They drive low-cost N-MOSFETs for both the high-side switch and synchronous rectifier and require no external Schottky power diode or current-sense resistor. Short- circuit and current-limit protection is provided by sensing the drain-to-source voltage on the low-side FET. Both devices can supply outputs as low as 0.8V and are well suited for DSP cores and other low-voltage logic.

The MAX1966 has an input range of 2.7V to 5.5V while the MAX1967 has an input range of 2.7V to 28V. In ultra-low-cost designs, the MAX1966/MAX1967 can provide efficiency exceeding 90% and can achieve 95% efficiency with optimized component selection.

The MAX1966/MAX1967 operate at 100kHz and ac-commodate aluminum electrolytic capacitors and powdered-iron core magnetics in minimum-cost designs. They also provide excellent performance with high-performance surface-mount components. The MAX1966 is available in a low-cost 8-pin SO package. The MAX1967 is available in a 10-pin µMAX package.

Key Features

  • Cost-Optimized Design
  • No Schottky Diode or Current-Sense Resistor Required
  • >95% Efficiency
  • Low-Cost External Components
  • All N-Channel FET Design
  • 2.7V to 5.5V Input Range (MAX1966)
  • 2.7V to 28V Input Range (MAX1967)
  • 0.8V Feedback for Low-Voltage Outputs
  • 100kHz Switching Frequency Accommodates Low-Cost Components
  • Thermal Shutdown
  • Output Current-Limit and Short-Circuit Protection
  • Applications/Uses

    • Cable Modems and Routers
    • Graphic Card Supplies
    • Networking Power Supplies
    • Set-Top Boxes
    • Telecom Power Supplies
    • Termination Supplies
    • xDSL Modems and Routers
    Parametric specs for Step-Down Switching Regulators
    VIN (V) (min) 2.7
    VIN (V) (max) 5.5
    VOUT1 (V) (min) 0.8
    VOUT1 (V) (max) 4.5
    IOUT1 (A) (max) 5
    Switch Type External
    Output Adjust. Method Resistor
    Synchronous Switching? Yes
    # DC-DC Outputs 1
    Switching Frequency (kHz) 100
    Package/Pins SOIC (N)/8
    Budgetary
    Price (See Notes)
    $1.72 @1k
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    Simplified Block Diagram

    MAX1966, MAX1967: Typical Operating Circuit MAX1966, MAX1967: Typical Operating Circuit Zoom icon

    Technical Docs

    Design & Development

    Click any title below to view the detail page where available.

    Description

    The MAX1966 evaluation kit (EV kit) is a fully assembled and tested circuit board that contains two independent step-down DC-to-DC converter circuits.

    The MAX1966 circuit is optimized for a 3V to 5.5V input range and delivers 1.8V at 2A. The MAX1967 circuit is optimized for a 4.9V to 20V input range and delivers 2.5V at 2A. Refer to the MAX1966/MAX1967 data sheet for component selection for higher current applications.

    View Details

    Features

    • Lowest Cost Solution
    • Up to 96% Efficiency
    • Evaluates MAX1966/MAX1967
    • 3V to 5.5V Input Range (MAX1966 Circuit)
      • 1.8V at 2A Output
    • 4.9V to 20V Input Range (MAX1967 Circuit)
      • 2.5V at 2A Output
    • Fully Assembled and Tested

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    Support & Training

    Search our knowledge base for answers to your technical questions.

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    Parameters

    Parametric specs for Step-Down Switching Regulators
    VIN (V) (min) 2.7
    VIN (V) (max) 5.5
    VOUT1 (V) (min) 0.8
    VOUT1 (V) (max) 4.5
    IOUT1 (A) (max) 5
    Switch Type External
    Output Adjust. Method Resistor
    Synchronous Switching? Yes
    # DC-DC Outputs 1
    Switching Frequency (kHz) 100
    Package/Pins SOIC (N)/8
    Budgetary
    Price (See Notes)
    $1.72 @1k

    Key Features

  • Cost-Optimized Design
  • No Schottky Diode or Current-Sense Resistor Required
  • >95% Efficiency
  • Low-Cost External Components
  • All N-Channel FET Design
  • 2.7V to 5.5V Input Range (MAX1966)
  • 2.7V to 28V Input Range (MAX1967)
  • 0.8V Feedback for Low-Voltage Outputs
  • 100kHz Switching Frequency Accommodates Low-Cost Components
  • Thermal Shutdown
  • Output Current-Limit and Short-Circuit Protection
  • Applications/Uses

    • Cable Modems and Routers
    • Graphic Card Supplies
    • Networking Power Supplies
    • Set-Top Boxes
    • Telecom Power Supplies
    • Termination Supplies
    • xDSL Modems and Routers

    Description

    The MAX1966/MAX1967 are voltage-mode pulse-width-modulated (PWM), step-down DC-DC controllers that are ideal for a variety of cost-sensitive applications. They drive low-cost N-MOSFETs for both the high-side switch and synchronous rectifier and require no external Schottky power diode or current-sense resistor. Short- circuit and current-limit protection is provided by sensing the drain-to-source voltage on the low-side FET. Both devices can supply outputs as low as 0.8V and are well suited for DSP cores and other low-voltage logic.

    The MAX1966 has an input range of 2.7V to 5.5V while the MAX1967 has an input range of 2.7V to 28V. In ultra-low-cost designs, the MAX1966/MAX1967 can provide efficiency exceeding 90% and can achieve 95% efficiency with optimized component selection.

    The MAX1966/MAX1967 operate at 100kHz and ac-commodate aluminum electrolytic capacitors and powdered-iron core magnetics in minimum-cost designs. They also provide excellent performance with high-performance surface-mount components. The MAX1966 is available in a low-cost 8-pin SO package. The MAX1967 is available in a 10-pin µMAX package.

    Simplified Block Diagram

    MAX1966, MAX1967: Typical Operating Circuit MAX1966, MAX1967: 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