1. Products
  2. Power Monitor, Control, and Protection
  3. Power Control
  4. PWM Controllers
  5. MAX5019


Features and Benefits

  • Wide Input Range: (18V to 110V) or (13V to 36V)
  • Isolated (without optocoupler) or nonisolated power supply
  • Current-Mode Control
  • Leading-Edge Blanking
  • Internally Trimmed 275kHz ±10% Oscillator
  • Low External Component Count
  • Soft-Start
  • High-Voltage Startup Circuit
  • Pulse-by-Pulse Current Limiting
  • Thermal Shutdown
  • SO-8 Package

Product Details

The MAX5019/MAX5020 integrate all the building blocks necessary for implementing DC-DC fixed-frequency power supplies. Either primary- or secondary-side regulation may be used to implement isolated or nonisolated power supplies. These devices are current-mode controllers with an integrated high-voltage startup circuit suitable for telecom/industrial voltage range power supplies. Current-mode control with leading-edge blanking simplifies control-loop design and internal ramp compensation circuitry stabilizes the current loop when operating at duty cycles above 50% (MAX5019). The MAX5019 allows 85% operating duty cycle and can be used to implement flyback converters whereas the MAX5020 limits the operating duty cycle to less than 50% and can be used in single-ended forward converters. A high-voltage startup circuit allows these devices to draw power directly from the 18V to 110V input supply during startup. The switching frequency is internally trimmed to 275kHz ±10%, thus reducing magnetics and filter component costs.

The MAX5019/MAX5020 are available in 8-pin SO packages.

Warning: The MAX5019/MAX5020 operate with high voltages. Exercise caution.


  • Industrial Power Supplies
  • Isolated Power Supplies
  • Networking Power Supplies
  • Telecom Power Supplies

Product Lifecycle icon-not-recommended Not Recommended for New Designs

This designates products ADI does not recommend broadly for new designs.

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
MAX5019CSA+ Material Declaration Reliability Data Small-Outline IC, Narrow (0.15in)
MAX5019CSA+T Material Declaration Reliability Data Small-Outline IC, Narrow (0.15in)
MAX5019ESA+ Material Declaration Reliability Data Small-Outline IC, Narrow (0.15in)
MAX5019ESA+T Material Declaration Reliability Data Small-Outline IC, Narrow (0.15in)
Wafer Fabrication Data

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