Advanced CV/CC secondary controller

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.

Key Features

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


Technical Documentation

Product Specifications
Description Version Size
DS6685 DS6685: Advanced constant voltage and constant current controller 1.1 255 KB
Technical Notes & Articles
Description Version Size
TA0308 TA0308: Reducing the total no-load power consumption of battery chargers and adapter applications 1.3 100 KB
Design Notes & Tips
Description Version Size
DN0002 DN0002: 10W off-line LED driver based on VIPER27 1.0 826 KB

Presentations & Training Material

Description Version Size
ST products and solutions for solar energy 5.1 2 MB

Publications and Collaterals

Description Version Size
Brochure Power management guide 09.2017 3 MB
Support & Community

Sample & Buy

Part Number Package Packing Type Operating Temperature (°C) (min) Operating Temperature (°C) (max) Reference Voltage (V) (nom) Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
SEA05TR SOT23-6L Tape And Reel - - - Active - - NEC EAR99 MALAYSIA MORE INFO Get Sample Add to cart DISTRIBUTOR AVAILABILITY

(*) 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

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
SEA05TR ActiveSOT23-6LIndustrialEcopack2 0 0

(**) 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.