SANYO STK740-470 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

5V/5A Single Output Separate Excitation

Chopper Regulator

Ordering number:EN*6107

STK740-470

SANYO Electric Co.,Ltd. Semiconductor Company

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

Preliminary
Overview

The STK740-470 is a separate-excitation step-down
chopper regulator hybrid IC for the secondstage circuit.
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 a 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. DC8V to 18V input voltage can be

handled and up to 5A of output current is supported.

Applications

• Local power supply for the equipment of which input
rating is DC9V to 15V.

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).

• Typical efficiency of 90% at DC 12V 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.

Package Dimensions

unit:mm

4170-SIP28

[STK740-470]

46.6

41.2

3.6

1

2.54

(6.63)

11×2.54=27.94

12

0.5

12.7

25.5

8.5

1.0

0.4

4.0

2.9

SANYO : SIP-28

63099RM (KT) No.6107–1/10

STK740-470

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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erutarepmetetartsbusCIgnitarepOxamcT 501+

erutarepmetgnitarepOrpoT 58+ot01–

erutarepmetegarotSgtsT 511+ot03–

egatlovtupniCDV

xam21dna,11,6sniP 02V

NI

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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tnerrucdaoLoItiucricdednemmocerehtnI 5ot1A

NI

tiucricdednemmocerehtnI 61ot8V

˚C

Electrical Characteristics at Tc = 25˚C, in the specified circuit, VIN = 12V, IO = 1A, unless othrwise specified

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egatlovtuptuOoV9.40.51.5V
noitalugereniL

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ycneiciffE

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tnerrucffotuCI

tiucricffo/nOffoVnip1–22.023.0V

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∆ LV
∆ OV

η

TUC

OVC

V

NI

Tc=+25 to +85˚C

V61otV8=–001–Vm

A5otA1=oI–001–Vm

A5.2=oI–09–%

edomhctal,nip6–6.1–Am

nimpytxam

sgnitaR

–7.1±–

mV/˚C

tinU

No.6107–2/10

Block Diagram

STK740-470

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.6107–3/10