Features and Benefits

  • Simple, Flexible Design
    • 5V to 36V Supply Range
    • Up to 91% Efficiency
    • Provides over 15W to Transformer
    • Undervoltage Lockout
    • Internal or External Clock Source
    • Synchronous Clock Output (MAX22258)
    • Programmable Overcurrent Threshold
    • 30ns to 200ns Adjustable Deadtime (MAX22258)
  • Robust Integrated System Protection
    • Fault Detection and Indication
    • Overcurrent Limiting up to 1A
    • Overtemperature Protection
    • Precision Internal Clock Source (±6%) Prevents Excessive Transformer Core Losses Due to Frequency Shift
    • Wide Temperature Range: -40°C to +125°C
  • Space Savings
    • Small 3mm x 3mm 10-Pin TDFN Package (MAX22256A/B/C) with 0.5mm Pitch
    • Small 4mm x 5mm 14-Pin TSSOP Package (MAX22258) with 0.65mm Pitch

Product Details

The MAX22256/MAX22258 integrated primary-side controllers and H-bridge drivers for isolated power-supply circuits feature a precision on-board oscillator, protection circuitry, and internal MOSFETs to provide up to 650mARMS of current to the primary winding of a transformer. These devices feature an internal 450kHz (typ) oscillator and can also be driven by an external clock to synchronize multiple devices and control EMI. An internal flip-flop stage guarantees a fixed 50% duty-cycle to prevent DC current flow in the transformer as long as the clock period is constant.

The MAX22256/MAX22258 operate from a wide single-supply voltage range from 5V to 36V and include undervoltage lockout for controlled startup. Break-before-make switching is integrated to prevent cross-conduction of the H-bridge MOSFETs. A resistor-adjustable overcurrent limit allows primary-side limiting of load currents on the transformer’s secondary side and thermal shutdown circuitry provides additional protection against excessive power dissipation.

The MAX22256A features a 30ns (typ) dead time for conventional H-bridge switching topologies. The MAX22256B/C feature a fixed dead time of 60ns (typ) and 100ns (typ), respectively, and are optimized for the zero-voltage switching of an LLC topology. The MAX22258 features a resistor-programmable dead time and a synchronized clock output (CLKO).


  • Isolated Motor Drive Gate Power Supply
  • Isolated +24V PLC Field Supply

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

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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.

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.