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  2. Power Monitor, Control, and Protection
  3. Power Control
  4. Transformer Drivers
  5. MAX253

Data Sheet Rev. 3
PDF
CN | JP
SPICE Model
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Overview

Features and Benefits

  • Simple Power-Supply Transformer Driver Design for Isolated RS-485/RS-232 Data-Interface Applications
    • Single 5V or 3.3V Supply
    • Low-Current Shutdown Mode: 0.4µA
    • Pin-Selectable Frequency: 350kHz or 200kHz
  • 8-Pin DIP, SO, and µMAX® Packages Take Minimal Board Space

Product Details

The MAX253 monolithic oscillator/power-driver is specifically designed to provide isolated power for an isolated RS-485 or RS-232 data interface. The device drives a center-tapped transformer primary from a 5V or 3.3V DC power supply. The secondary can be wound to provide any isolated voltage needed at power levels up to 1W.

The MAX253 consists of a CMOS oscillator driving a pair of N-channel power switches. The oscillator runs at double the output frequency, driving a toggle flip-flop to ensure 50% duty cycle to each of the switches. Internal delays are arranged to ensure break-before-make action between the two switches.

The SD pin puts the entire device into a low-power shutdown state, disabling both the power switches and oscillator.

Applications

  • Bridge Ground Differentials
  • High Noise-Immunity Communications Interface
  • Isolated and/or High-Voltage Power Supplies
  • Isolated RS-485/RS-232 Power Supply
  • Medical Equipment
  • Process Control
  • Transformer Driver

Product Categories

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At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Documentation & Resources

  • View All (12)
  • Data Sheet (1)
  • Reliability Data (1)
  • Design Note (4)
  • Customer Case Study (1)
  • Technical Article (5)
    • Document Type

    Tools & Simulations

    SPICE Model

    Design Resources

    ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

    Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
    MAX253CPA+ Material Declaration Reliability Data Plastic Dual-In-Line, Narrow (0.3in)
    MAX253CSA+ Material Declaration Reliability Data Small-Outline IC, Narrow (0.15in)
    MAX253CSA+T Material Declaration Reliability Data Small-Outline IC, Narrow (0.15in)
    MAX253CUA+ Material Declaration Reliability Data Micro-MAX, Thin Shrink Small-Outline
    MAX253CUA+T Material Declaration Reliability Data Micro-MAX, Thin Shrink Small-Outline
    MAX253EPA+ Material Declaration Reliability Data Plastic Dual-In-Line, Narrow (0.3in)
    MAX253ESA+ Material Declaration Reliability Data Small-Outline IC, Narrow (0.15in)
    MAX253ESA+T Material Declaration Reliability Data Small-Outline IC, Narrow (0.15in)
    MAX253ESA/V+ Material Declaration Reliability Data Small-Outline IC, Narrow (0.15in)
    MAX253ESA/V+T Material Declaration Reliability Data Small-Outline IC, Narrow (0.15in)
    MAX253EUA+ Material Declaration Reliability Data Micro-MAX, Thin Shrink Small-Outline
    MAX253EUA+T Material Declaration Reliability Data Micro-MAX, Thin Shrink Small-Outline
    MAX253MJA Material Declaration Reliability Data Ceramic Dual-In-Line, Narrow (0.3in)
    MAX253MSA/PR+ Material Declaration Reliability Data Small-Outline IC, Narrow (0.15in)
    Wafer Fabrication Data MAX253 Reliability Data

    PCN-PDN Information

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    Select Model for PCN Information
    • MAX253CSA+ Production
    • MAX253CSA+T Production
    • MAX253CUA+ Production
    • MAX253CUA+T Production
    • MAX253ESA+ Production
    • MAX253ESA+T Production
    • MAX253EUA+ Production
    • MAX253EUA+T Production
    • MAX253MSA/PR+ Production

    Support & Discussions

    MAX253 Discussions

    ADUM3151 Tying several MI Lines together and more questions
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