Details, datasheet, quote on part number: STK740-400
DatasheetDownload STK740-400 datasheet


Features, Applications

3.3V/5A Single Output Separate Excitation Chopper Regulator

The is a separate-excitation step-down chopper regulator hybrid IC for the secondstage circuit and optimal 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 to be used to construct a large-current (5A) chopper regulator a 3-pin regulator were used.


3.3V local power supply for the logic circuit where both 5V and 3.3V systems are constructed togeter.


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 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 and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft's control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications. SANYO assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges,or other parameters) listed in products specifications of any and all SANYO products described or contained herein.

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

This product is listed in a product series due to its property such as output voltage, output current, package, and other similar items. Since some prducts listed in the table below is under development, please refer to your Sanyo sales representative for details.

Type number * : Under planning 10A 5A Input voltage Output voltage Output current 10A 5A Package dimensions (output pins not included) 4.5mm,12pins 8.5mm,12pins


Parameter Operating IC substrate temperature Operating temperature Storage temperature DC input voltage Symbol Tc max Topr Tstg VIN max Pins 6, 11, and 12 Conditions Ratings +115 10 Unit

Parameter Operating IC substrate temperature DC input voltage Load current Symbol Tc VIN Io In the recommended circuit In the recommended circuit Conditions Ratings to 5 Unit V A

Electrical Characteristics 25C, in the specified circuit, VIN = 1A, unless othrwise specified

Parameter Output voltage Load regulation Efficiency Operating frequency Cutoff current On/off circuit Output voltage temperature coefficient Symbol Vo VO fosc ICUT Voff TCVO 6pin, latch mode 5A Io=2.5A Conditions Ratings min 3.2 typ 3.3 max 3.4 50 Unit mV % kHz mA V

SUB Low-voltage malfunction prevention circuit Phase compensation


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