STK740-441 Datasheet, PDF (1/10 Pages) Sanyo Semicon Device – 3.3V/5A Single Output Separate Excitation Chopper Regulator

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 protec-
tion, low-voltage malfunction prevention, on/off, and
snubber circuits. Therefore, external components re-
quired 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 regula-
tor were used.
Applications
• 3.3V local power supply for the logic circuit where
both 5V and 3.3V systems are constructed togeter.
Package Dimensions
unit:mm
4171-SIP12
[STK740-441]
37.0
4.5
1
2.54
12
0.5
11×2.54=27.94
2.9
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 Derat-
ing” 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-R_ON resistance power MOSFET adopted.
• Low-V_F 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.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
63099RM (KT) No.6106–1/10