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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.
Package Dimensions
unit:mm 4171-SIP12
[STK740-441]
37.0
4.5
25.5
0.5 25.5 2.9
1 2.54
12 0.5
11x2.54=27.94
Applications
* 3.3V local power supply for the logic circuit where both 5V and 3.3V systems are constructed togeter.
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 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 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
5.0
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 STK740-411 STK740-420 STK740-441 4 to 8V STK740-450 STK740-471 STK740-470 8 to 18V STK740-480 STK740-490 * : Under planning 5.0V 10A 15A 25.5 x 46.6 x 8.5mm,12pins 25.5 x 46.6 x 8.5mm,12pins 3.3V 10A 5A 5A Input voltage Output voltage Output current 4 to 8V 4 to 8V 2.5V 2.5V 5A 10A 5A Package dimensions (output pins not included) 26 x 37 x 4.5mm,12pins 25.5 x 46.6 x 8.5mm,12pins 26 x 37 x 4.5mm,12pins 25.5 x 46.6 x 8.5mm,12pins 26 x 37 x 4.5mm,12pins 25.5 x 46.6 x 8.5mm,12pins
Specifications
Maximum Ratings at Ta = 25C, Tc = 25C, unless otherwise specified.
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 +105 -10 to +85 -30 to +115 10 Unit
C C C
V
Recommended Operating Conditions at Ta = 25C
Parameter Operating IC substrate temperature DC input voltage Load current Symbol Tc VIN Io In the recommended circuit In the recommended circuit Conditions Ratings 0 to +85 4.5 to 6.5 1 to 5 Unit C V A
Electrical Characteristics at Tc = 25C, in the specified circuit, VIN = 5V, IO = 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 1pin Io=1A to 5A Io=2.5A 45 88 50 1.6 0.22 1.7 0.32 55 Conditions Ratings min 3.2 typ 3.3 max 3.4 50 Unit V mV % kHz mA V
Tc=+25 to +85C
mV/C
No.6106-2/10
STK740-441
Block Diagram
12 VIN VCC 11 6
Reference voltage Drive circuit
TR1
D1
10 9 8 OUT
Snubber circuit
7
Error amplifier PWM
A VS VADJ
2 3
GND
5
SUB Low-voltage malfunction prevention circuit Phase compensation
4
On/off circuit Soft start circuit
FB
1
ON/OFF
Oscillator
Short protection circuit
Pin Descriptions
Number Pin name Description
No.6106-3/10
STK740-441
Test Circuit
12 11 10 9
8
76
54
3
21 ON/OFF Vo adjust
DC INPUT C1 FB
L1 C2
OUTPUT (3.3V)
GND
C1 C2 L1 FB : 220F/10V (OS capacitor) : 2200F/6.3V : 30H : Ferrite-bead core
GND
Overvoltage Protection Circuit In a constant-voltage power supply circuit output voltage may generally exceed the stipulated rating (equivalent to input voltage) when the circuit is broken down or the IC and the printed circuit board is wrongly soldered. Therefore overvoltage protection circuit is recommended to use to minimize the damages caused by the overvoltage.
Sample the overvoltage protection circuit
FUSE DC INPUT Regulator OUTPUT
SCR
GND
CR
GND
No.6106-4/10
STK740-441
Sample Characteristics at Ta = 25C, in the test circuit
Output Voltage vs.Output Current
3.6
VIN=5V
3.5
Output Voltage Vo[V]
3.4
3.3
3.2
3.1
3.0 0 1 2 3 Output Current Io[A] 4 5 6
Efficiency vs.Output Current
100
VIN=5V
90
Efficiency [%]
80
70
60
50 0 1 2 3 Output Current Io[A] 4 5 6
No.6106-5/10
STK740-441
Output Voltage vs.Input Voltage
3.6
IO=5A
3.5 Output Voltage Vo[V]
3.4
3.3
3.2
3.1
3.0 2 3 4 5 6 Input Voltage VIN[V] 7 8
No Fin Output Current Derating
6.0
VIN=5V
5.0
Output Current Io[A]
4.0
3.0
2.0
1.0
0.0 -10 0 10 20 30 40 50 60 Ambient Temperature Ta[C] 70 80 90 100
No.6106-6/10
STK740-441
Tc vs.Output Current
No Fin
70
VIN=5V
60
Tc[deg.]
50 40 30 20 10 0 0 1 2 3 Output Current Io[A] 4 5 6
Tc Heat up
Power Dissipation vs Output Current
4.0
VIN=5V
Power Dissipation PD [W]
3.0
2.0
1.0
0.0 0 1 2 3 Output Current Io[A] 4 5 6
No.6106-7/10
STK740-441
Eveluation Board The evaluation board is provided to evaluate this hybrid IC Equivalent Circuit
12 11 10
9
8
7
6
5
4
3
2
1
IC1 ON/O FF Vs R2
V IN L1
Vo
C1
FB1
C2
GND
GND
Parts Table
Part name C1 C2 R2 R3 R6 Requirements Number 1 1 1 1 1 BL02RN1-R62 HK-10S100-4500 1 1 Use a fuse resistor (20 to 30) when needed Murata manufacturing co., ltd. Toho zinc co., ltd. 45H, 5A Manufacturer Sanyo Electronic component co., ltd. Sanyo Electronic component co., ltd. Notes OS capacitor Low impedance (CG)
Electrolytic capacitor 220F/10V Electrolytic capacitor 2200F/6.3V Resistor Jumper Jumper 100
FB1 Ferrite-bead core L1 Choke coil
Notes on pattern designing 1 Place VCC pin (pin 6) and VIN pins (pin 11 and 12) lines separately and use an input capacitor (+) for connection. 2 Place GND pin (pin 5) and A pin (pins 7 and 8) lines separately. 3 Connect A pin (pins 7 and 8) with the input capacitor (-) through a Ferrite-bead core. 4 Connect GND pin (pin 5) with the input capacitor (-) or the output capacitor (-). However, connect with the output capacitor (-) unless otherwise specified. 5 Shorten the length of the line between the input capacitor (-) and the output capacitor (-) as well as possible. 6 Connect VS pin (pin 2) with the output capacitor (+).
No.6106-8/10
STK740-441
Perspective Wiring Layout (from soldered side)
R6 CN 3 C1a IC1 FB1 R5 R1R2 R3
S-GND ON/OFF
C1b
C4
C5
C6
+Vs VIN GND
CN1 C1c C8 C2a C2b C9 CN 2 C2c L1
+Vo GND
Circuit Pattern (soldered side)
STK740-400 TEST-B
No.6106-9/10
STK740-441
Specifications of any and all SANYO products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer's products or equipment. SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all semiconductor products fail with some probability. It is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire, or that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. In the event that any or all SANYO products(including technical data,services) described or contained herein are controlled under any of applicable local export control laws and regulations, such products must not be expor ted without obtaining the expor t license from the authorities concerned in accordance with the above law. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written permission of SANYO Electric Co., Ltd. Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the SANYO product that you intend to use. Information (including circuit diagrams and circuit parameters) herein is for example only ; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties.
This catalog provides information as of June, 1999. Specifications and information herein are subject to change without notice.
PS No.6106-10/10

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