SEA05

www.DataSheet4U.com SEA05 Advanced constant voltage and constant current controller 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   SOT23 - 6L 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. Figure 1. Internal schematic 2.5 V 1.23 V Vcc 6 Applications ■ ■ ■ Battery chargers AC-DC adapters LED drivers Description 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 ci...