STK740-441

Ordering number:EN6106 Thick Film Hybrid IC STK740-441 3.3V/5A Single Output Separate Excitation Chopper Regulator Overview The STK740-441 is a separate-excitation step-down chopper regulator hybrid IC for the secondstage circuit and optimal as a 3.3V local power supply for use in logic circuit that includes both 5V and 3.3V systems. This IC incorporates in the package all the necessary circuits for a chopper regulator including power switch, error amplifier, soft start, shutdown type output short protection, low-voltage malfunction prevention, on/off, and snubber circuits. Therefore, external components required are input and output capacitors and choke coil only and this allows this IC to be used to construct a large-current (5A) chopper regulator as if a 3-pin regulator were used. Package Dimensions unit:mm 4171-SIP12 [STK740-441] 37.0 4.5 25.5 0.5 25.5 2.9 1 2.54 12 0.5 11×2.54=27.94 Applications 3.3V local power supply for the logic circuit where both 5V and 3.3V systems are constructed togeter. SANYO : SIP-12 Features Adoption of Sanyo IMST ; Insulated Metal Substrate Technology, allows the circuit to be operated without using a heat sink (see “No Fin Output Current Derating” chart in the page 6). Slim package reduces mounting space. Typical efficiency of 88% at DC 5V input, 2.5A output. Fine adjustment of output voltage enable. 50 kHz operating frequency. Low-RON resistance power MOSFET adopted. Low-VF Schottky barrier diode adopted. Any an...