Ordering number:EN6106 Thick Film Hybrid IC STK740-441 3.3V/5A Single Output Separate Excitation Chopper Regulator Overview Package Dimensions 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. unit:mm 4171-SIP12 [STK740-441] 4.5 5.0 0.5 25.5 25.5 37.0 12 1 2.54 2.9 0.5 11×2.54=27.94 Applications SANYO : SIP-12 • 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. 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 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 Package dimensions (output pins not included) Input voltage Output voltage Output current ∗ STK740-411 4 to 8V 2.5V 5A 26 × 37 × 4.5mm,12pins ∗ STK740-420 4 to 8V 2.5V 10A 25.5 × 46.6 × 8.5mm,12pins 5A 26 × 37 × 4.5mm,12pins 4 to 8V 3.3V STK740-450 10A 25.5 × 46.6 × 8.5mm,12pins STK740-471 5A 26 × 37 × 4.5mm,12pins 5A 25.5 × 46.6 × 8.5mm,12pins STK740-480 10A 25.5 × 46.6 × 8.5mm,12pins STK740-490 15A 25.5 × 46.6 × 8.5mm,12pins STK740-441 STK740-470 8 to 18V 5.0V * : Under planning Specifications Maximum Ratings at Ta = 25˚C, Tc = 25˚C, unless otherwise specified. Parameter Operating IC substrate temperature Operating temperature Storage temperature DC input voltage Symbol Conditions Ratings Tc max ˚C –10 to +85 ˚C –30 to +115 ˚C 10 V Topr Tstg VIN max Unit +105 Pins 6, 11, and 12 Recommended Operating Conditions at Ta = 25˚C Parameter Symbol Operating IC substrate temperature Tc DC input voltage VIN Io Load current Conditions Ratings Unit 0 to +85 ˚C In the recommended circuit 4.5 to 6.5 V In the recommended circuit 1 to 5 A Electrical Characteristics at Tc = 25˚C, in the specified circuit, VIN = 5V, IO = 1A, unless othrwise specified Parameter Symbol Output voltage Vo Load regulation ∆VO Efficiency η Conditions Ratings min 3.2 typ 3.3 Io=1A to 5A Io=2.5A max 3.4 V 50 mV 55 kHz 88 Operating frequency fosc 45 50 Cutoff current ICUT Voff 6pin, latch mode On/off circuit 1pin 0.22 Output voltage temperature coefficient TCVO Tc=+25 to +85˚C ±1.7 Unit % 1.6 mA 0.32 V mV/˚C No.6106–2/10 STK740-441 Block Diagram TR1 12 VIN D1 11 Snubber circuit 6 VCC 7 Error amplifier PWM 5 OUT A 2 VS 3 VADJ 4 FB 1 ON/OFF Phase compensation Low-voltage malfunction prevention circuit SUB 9 8 Drive circuit Reference voltage GND 10 On/off circuit Soft start circuit Short protection circuit Oscillator Pin Descriptions Description Number Pin name 1 ON/OFF Remote on/off switching 2 VS Output voltage sensing 3 VADJ 4 FB 5 GND Ground 6 VCC Power supply for control block 7, 8 A 9, 10 OUT Output 11, 12 VIN Input supply voltage Output voltage fine adjustment Feedback (error amplifier output), phase compensation Flywheel diode anode No.6106–3/10 STK740-441 Test Circuit 12 11 10 9 8 7 6 5 4 3 2 1 ON/OFF Vo adjust DC INPUT L1 C1 FB C2 GND GND C1 C2 L1 FB OUTPUT (3.3V) : 220µF/10V (OS capacitor) : 2200µF/6.3V : 30µH : Ferrite-bead core 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 Regulator DC INPUT OUTPUT SCR GND CR GND No.6106–4/10 STK740-441 Sample Characteristics at Ta = 25˚C, in the test circuit Output Voltage vs.Output Current 3.6 VIN=5V Output Voltage Vo[V] 3.5 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 Efficiency η[%] 90 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 I O =5A Output Voltage Vo[V] 3.5 3.4 3.3 3.2 3.1 3.0 2 3 4 5 6 Input Voltage V IN[V] 7 8 No Fin Output Current Derating 6.0 V IN=5V Output Current Io[A] 5.0 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 No Fin ∆Tc vs.Output Current 70 VIN=5V Tc Heat up ∆Tc[deg.] 60 50 40 30 20 10 0 0 1 2 3 Output Current Io[A] 4 5 6 Power Dissipation vs Output Current 4.0 Power Dissipation PD [W] VIN=5V 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 3 4 2 1 IC1 ON/O FF Vs R2 V IN Vo L1 C1 FB1 C2 GND GND ♦ Parts Table Part name Requirements Number Manufacturer Notes C1 Electrolytic capacitor 220µF/10V 1 Sanyo Electronic component co., ltd. OS capacitor C2 Electrolytic capacitor 2200µF/6.3V 1 Sanyo Electronic component co., ltd. Low impedance (CG) R2 Resistor 1 R3 Jumper 1 R6 Jumper 1 Use a fuse resistor (20 to 30Ω) when needed BL02RN1-R62 1 Murata manufacturing co., ltd. HK-10S100-4500 1 Toho zinc co., ltd. FB1 Ferrite-bead core L1 Choke coil 100Ω 45µH, 5A ♦ 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 IC1 C1a S-GND ON/OFF R5 R1R2 FB1 R3 C1b C4 C5 C6 +Vs C2c VIN +Vo L1 GND GND C1c CN1 C8 C2a C2b C9 CN 2 ♦ 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