MAX22256

RECOMMENDED FOR NEW DESIGNS

Compact, 36V H-Bridge Transformer Driver for Isolated Supplies

Wide-Range Transformer Driver Simplifies Isolated Power Designs

Data Sheet (Rev. 0)
Product Selection Table
Part Models
6
1ku List Price
Starting From $3.39
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Part Details

  • 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
MAX22256
Compact, 36V H-Bridge Transformer Driver for Isolated Supplies
MAX22256, MAX22258: Typical Operating Circuit
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Documentation

Data Sheet 1

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Evaluation Kits

eval board
schematic 1
MAX22256EVKIT

Evaluation Kit for the MAX22256

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Features and Benefits

  • 5V to 36V Input Supply Range
  • Up to 90% Efficiency
  • Full-Wave Rectified Output
  • Configurable for a Voltage Doubler, Full-Wave, and Half-Wave Rectifier
  • Internal or External Clock Operation Option
  • Designed for 1500VRMS Isolation
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Details

The MAX22256 evaluation kit (EV kit) is a fully assembled and tested PCB that contains the MAX22256, a 15W isolated H-bridge DC-DC converter. The EV kit operates from a 5V to 36V DC power source and the onboard 1:1 turns-ratio transformer from Wurth sets the output voltage, operating up to a 1A current limit.

The EV kit provides greater than 90% overall efficiency at +24V between 2.2W and up to 8.3W output power using an H-bridge DC-DC converter topology. The MAX22256 EV kit operates in pulse width modulation (PWM) mode, by default. The transformer provides galvanic isolation with the output powered from a full-wave rectifier circuit, reducing the output-voltage ripple.

The EV kit circuit is configured as a full-wave rectifier with an output voltage that follows the input voltage, but is configurable for other topologies.

The EV kit comes with the MAX22256B installed but can be used to evaluate any version of the MAX22256 (MAX22256A, MAX22256B, and MAX22256C).

Applications

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

eval board
schematic 2
MAX22258EVKIT

Evaluation Kit for the MAX22258

Buy Now View Details

Features and Benefits

  • 5V to 36V Input Supply Range
  • Up to 90% Efficiency
  • Full-Wave Rectified Output
  • Configurable for a Voltage Doubler, Full-Wave, and Half-Wave Rectifier
  • Internal or External Clock Operation Option
  • Designed for 1500VRMS Isolation
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Details

The MAX22258 evaluation kit (EV kit) is a fully assembled and tested PCB that contains the MAX22258, a 15W isolated H-bridge DC-DC converter. The EV kit operates from an 5V to 36V DC power source and the on-board 1:1 turns-ratio transformer from Wurth sets the output voltage, operating up to a 1A current limit.

The EV kit provides greater than 90% overall efficiency at +24V between 2.2W and up to 8.3W output power using an H-bridge DC-DC converter topology. The MAX22258 EV kit operates in LLC mode by default. Input-ripple current and radiated noise are minimized by the inherent balanced nature of the design with no interruption in the input current. The transformer provides galvanic isolation with the output powered from a full-wave rectifier circuit, reducing the output-voltage ripple.

The EV kit circuit is configured as a full-wave rectifier, with an output voltage that follows the input voltage but is configurable for other topologies.

Applications

  • Isolated Motor Drive Gate Power Supply
  • Isolated +24V PLC Field Supply
MAX22256EVKIT
Evaluation Kit for the MAX22256
MAX22256EVKIT: Typical Operating Circuit
MAX22258EVKIT
Evaluation Kit for the MAX22258
MAX22258EVKIT: Board Photo

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