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Low-Cost Voltage-Mode PWM Step-Down Controllers

Product Details

Key Features

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2.7
VIN (V) (max) 28
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 UMAX/10
Budgetary
Price (See Notes)
1.97
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2.7
VIN (V) (max) 28
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 UMAX/10
Budgetary
Price (See Notes)
1.97

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 .

    Sampling:
    Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.