Features and Benefits

  • High Voltage: Operation Up to 60V
  • High Current: Dual N-Channel Synchronous Drive Handles Up to 10,000pF Gate Capacitance
  • Programmable Average Load Current Limiting
  • 5V Reference Output with 10mA External Loading Capability
  • Programmable Fixed Frequency Synchronizable Current Mode Operation Up to 150kHz
  • Undervoltage Lockout with Hysteresis
  • Programmable Start Inhibit for Power Supply Sequencing and Protection
  • Adaptive Nonoverlapping Gate Drive Prevents Shoot-Through

Product Details

The LT1339 is a high power synchronous current mode switching regulator controller. The IC drives dual N-channel MOSFETs to create a single IC solution for high power DC/DC converters in applications up to 60V.

The LT1339 incorporates programmable average current limiting, allowing accurate limiting of DC load current independent of inductor ripple current. The IC also incorporates user-adjustable slope compensation for minimization of magnetics at duty cycles up to 90%.

The LT1339 timing oscillator operating frequency is programmable and can be synchronized up to 150kHz. Minimum off-time operation provides main switch protection. The IC also incorporates a soft start feature that is gated by both shutdown and undervoltage lockout conditions.

An output phase reversal pin allows flexibility in configuration of converter types, including inverting and negative topologies.


  • 48V Telecom Power Supplies
  • Personal Computers and Peripherals
  • Distributed Power Converters
  • Industrial Control Systems
  • Lead-Acid Battery Backup Systems
  • Automotive and Heavy Equipment

Product Lifecycle icon-recommended Production

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.

Evaluation Kits (7)

Tools & Simulations


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Models for the following parts are available in LTspice:


Design Resources

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PCN-PDN Information

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Evaluation Boards

Pricing displayed is based on 1-piece.

Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

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.