High-Voltage PWM Power-Supply Controller

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The MAX5003 high-voltage switching power-supply controller has all the features and building blocks needed for a cost-effective flyback and forward voltage-mode control converter. This device can be used to design both isolated and nonisolated power supplies with multiple output voltages that operate from a wide range of voltage sources. It includes a high-voltage internal start-up circuit that operates from a wide 11V to 110V input range. The MAX5003 drives an external N-channel power MOSFET and has a current-sense pin that detects overcurrent conditions and turns off the power switch when the current-limit threshold is exceeded. The choice of external power MOSFET and other external components determines output voltage and power.

The MAX5003 offers some distinctive advantages: soft-start, undervoltage lockout, external frequency synchronization, and fast input voltage feed-forward. The device is designed to operate at up to 300kHz switching frequency. This allows use of miniature magnetic components and low-profile capacitors. Undervoltage lockout, soft-start, switching frequency, maximum duty cycle, and overcurrent protection limit are all adjustable using a minimum number of external components. In systems with multiple controllers, the MAX5003 can be externally synchronized to operate from a common system clock.

Warning: The MAX5003 is designed to operate with high voltages. Exercise caution.

The MAX5003 is available in 16-pin SO and QSOP packages. An evaluation kit (MAX5003EVKIT) is also available.
MAX5003: Pin Configuration MAX5003: Pin Configuration Enlarge+

Key Features

  • Wide Input Range: 11V to 110V
  • Internal High-Voltage Startup Circuit
  • Externally Adjustable Settings
    • Output Switch Current Limit
    • Oscillator Frequency
    • Soft-Start
    • Undervoltage Lockout
    • Maximum Duty Cycle
  • Low External Component Count
  • External Frequency Synchronization
  • Primary or Secondary Regulation
  • Input Feed-Forward for Fast Line-Transient Response
  • Precision ±2.5% Reference over Rated Temperature Range
  • Thermal Shutdown


  • +42V Automobile Systems
  • High-Voltage Power Supply Modules
  • Industrial Power Supplies
  • ISDN Power Supplies
  • Telecommunication Power Supplies

Technical Documents

App Note 3539 A 50 Watt Internal Bus Architecture (IBA) Power Supply
App Note 3363 New Ethernet Systems Distribute DC Power with Data
App Note 819 Isolated Power Supply Is Suitable For Telecom/Datacom Applications

Quality and Environmental Data

Request Reliability Report for: MAX5003 
Lead-Free Package Tin (Sn) Whisker Reports

Additional Resources

Design and simulate isolated power supplies with free MAX5003 Isolated Power Supply Design Software
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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