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STK740-441 - 3.3V/5A Single Output Separate Excitation Chopper Regulator

General Description

Number Pin name Description No.6106 3/10 STK740-441 Test Circuit 12 11 10 9 8 7 6 5 4 3 2 1 ON/OFF Vo adjust DC INPUT C1 FB L1 C2 OUTPUT (3.3V) GND C1 C2 L1 FB : 220µF/10V (OS capacitor) : 2200µF/6.3V : 30µH : Ferrite-bead core GND Overvoltage Protection Circuit In a constant-

Key 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.

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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.