SANYO STK740-441 Datasheet

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.

Thick Film Hybrid IC

3.3V/5A Single Output Separate Excitation
Chopper Regulator

Ordering number:EN6106

STK740-441

SANYO Electric Co.,Ltd. Semiconductor Company

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

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 regula-

tor were used.

Package Dimensions

unit:mm

4171-SIP12

[STK740-441]

37.0

1

2.54

11×2.54=27.94

25.5

12

0.5

4.5

2.9

0.5

25.5

5.0

Applications

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

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.

SANYO : SIP-12

63099RM (KT) No.6106–1/10

STK740-441

Series Construction

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 Input voltage

STK740-411

∗

STK740-420

∗

STK740-441
STK740-450
STK740-471

STK740-470
STK740-480

STK740-490

4 to 8V
4 to 8V

4 to 8V

8 to 18V

Output voltage Output current

2.5V

2.5V

5A

10A

5A

3.3V
10A

5A
5A

5.0V
10A

15A

25.5 × 46.6 × 8.5mm,12pins

25.5 × 46.6 × 8.5mm,12pins

25.5 × 46.6 × 8.5mm,12pins

25.5 × 46.6 × 8.5mm,12pins

25.5 × 46.6 × 8.5mm,12pins

* : Under planning

Specifications

Maximum Ratings at Ta = 25˚C, Tc = 25˚C, unless otherwise specified.

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xam21dna,11,6sniP 01V

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Package dimensions

(output pins not included)

26 × 37 × 4.5mm,12pins

26 × 37 × 4.5mm,12pins

26 × 37 × 4.5mm,12pins

˚C
˚C
˚C

Recommended Operating Conditions at Ta = 25˚C

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Electrical Characteristics at Tc = 25˚C, in the specified circuit, VIN = 5V, IO = 1A, unless othrwise specified

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∆ OV

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TUC

OVC

Tc=+25 to +85˚C

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No.6106–2/10

Block Diagram

STK740-441

12

V

IN

11

CC

6

5

V

GND

Pin Descriptions

Reference voltage

SUB

Oscillator

Drive circuit

Low-voltage
malfunction
prevention circuit

TR1

PWM

Snubber circuit

Error amplifier

Phase
compensation

On/off circuit
Soft start circuit
Short protection circuit

D1

10

9
8

7

2
3

4

1

OUT

A

V

S

V

ADJ

F

B

ON/OFF

Number Pin name

1 ON/OFF

V

V

V

S

ADJ
F

B

CC

IN

2
3
4
5 GND
6

7,8 A

9,10 OUT

11,12 V

Description

Remoteon/offswitching
Outputvoltagesensing
Outputvoltagefineadjustment
Feedback(erroramplifieroutput),phasecompensation
Ground
Powersupplyforcontrolblock
Flywheeldiodeanode
Output
Inputsupplyvoltage

No.6106–3/10