Secondary Side Synchronous Rectifier Controller - UCC24610


Secondary Side Synchronous Rectifier Controller


This GREEN Rectifier controller is a high-performance controller and driver for standard and logic-level N-channel MOSFET power devices used for low-voltage secondary-side synchronous rectification.

The combination of controller and MOSFET emulates a near-ideal diode rectifier. This solution not only directly reduces power dissipation of the rectifier but also indirectly reduces primary-side losses as well, due to compounding of efficiency gains.

Using drain-to-source voltage sensing, the UCC24610 is ideal for Flyback and LLC-resonant power supplies but can also be used with other power architectures. The UCC24610 is optimized for output voltages from 4.5 V to 5.5 V, and is suitable for use with lower and higher output voltages as well.

The UCC24610 offers a programmable false-triggering filter, a programmable timer to automatically switch to light-load mode at light load, and a SYNC input for optional use in continuous conduction mode (CCM) systems. Protection features on TON and EN/TOFF pins prevent run-away on-time due to open-circuit or short-circuit fault conditions.

This device is available in an 8-pin SOIC package and an 8-pin, 3.0-mm × 3.0-mm SON package with an exposed thermal pad.


  • Secondary-Side Controller Optimized for 5-V Systems
  • Up to 600-kHz Operating Frequency
  • VDS MOSFET-Sensing
  • 1.6-Ω Sink, 2.0-Ω Source Gate-Drive Impedances
  • Micro-Power Sleep Current for 90+ Designs
  • Automatic Light-Load Management
  • Synchronous Wake-Up From Sleep and Light-Load Modes
  • Protection Features on Programming Inputs
  • SYNC Input for CCM Operation
  • 20-ns Typical Turnoff Propagation Delay
  • Improved Efficiency and Design Flexibility Over Traditional Diode Solution
  • May Be Biased Directly From 5-V Output
  • Minimal Component Count
    • AC-to-DC 5-V Adapters
    • 5-V Bias Supplies
    • Low Voltage Rectification Circuits
    • Flyback and LLC Converters
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    Parametrics Compare all products in Synchronous Rectifier

    Frequency (Max) (kHz)
    UVLO Thresholds On/Off (V)
    Special Features
    Operating Temperature Range (C)
    Package Group
    Estimated Package Size (WxL) (mm2)
    Approx. Price (US$)
    UCC24610 UCC24630 UCC24636
    600     200     130    
    4.4/4.2     4/3.6     4/3.6    
    SYNC pin for CCM     Compatible with CCM      
    -40 to 125     -40 to 125     -40 to 125    
    SOT-23     SOT-23    
    Catalog     Catalog     Catalog    
    8SON: 9 mm2: 3 x 3
    8SOIC: 19.159 mm2: 3.91 x 4.9    
    6SOT-23: 4.64 mm2: 1.6 x 2.9     6SOT-23: 4.64 mm2: 1.6 x 2.9    
    0.75 | 1ku     0.60 | 1ku     0.50 | 1ku