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Advanced CV/CC secondary controller
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The SEA05 is a highly integrated solution for SMPS applications requiring a dual control loop to perform CV (constant voltage) and CC (constant current) regulation.

The device integrates a voltage reference, two opamps (with OR-ed open-drain outputs), and a lowside current sensing circuit.

The voltage reference, along with one op-amp, is the core of the voltage control loop; the current sensing circuit and the other op-amp make up the current control loop.

The external components needed to complete the two control loops are: a resistor divider that senses the output of the power supply and fixes the voltage regulation setpoint at the specified value; a sense resistor that feeds the current sensing circuit with a voltage proportional to the dc output current; this resistor determines the current regulation setpoint and must be adequately rated in terms of power dissipation; the frequency compensation components (R-C networks) for both loops.

The device, housed in one of the smallest available package, is ideal for space-shrunk applications such as adapters and chargers.

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Errata Sheet
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Key Features

  • Constant voltage and constant current control
  • Wide operating VCC range [3.5 - 36] V
  • Low quiescent consumption: 200 µA
  • Voltage reference: 2.5 V
  • Voltage control loop accuracy +/- 0.5%
  • Current sense threshold: 50 mV
  • Open-drain output stage
  • Low external component count
  • SOT23-6L micro package

Design Resources


Technical Documentation

Product Specifications

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Application Notes

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Technical Notes & Articles

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TA0308: Reducing the total no-load power consumption of battery chargers and adapter applications
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Design Notes & Tips

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Presentations & Training Material


Description Version Size
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Sample & Buy

Part Number Marketing StatusPackagePacking TypeOperating Temperature (min) Operating Temperature (max) Reference Voltage (nom) Automotive GradeOrder From STUnit Price (US$)*
@ 1000
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
SEA05TRActiveSOT23-6LTape And Reel_Free Samples.19Distributor reported inventory date: 2016-02-06
Distributor NameRegionStockMin. order
ANGLIA LiveOrder NowEUROPE510003000
Farnell Element14Order NowEUROPE32641

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
(**) The Material Declaration forms available on may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
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