DC/DC Step-Down Converter IC SI-8000TM Series ■General Descriptions September 2005 ■Package---TO252-5 SI-8000TM series has 300kHz oscillation frequency, so it contributes miniaturization of a chalk coil. Therefore, it realizes a compact and high efficient power supply together with TO 252-5 package (compatible:SC-63) . SI-8000TM series has the function required for switching regulators and protection circuits such as over-current, and overheating. With only four discrete components, it realizes a high efficient switching regulator without adjustment. 1.5A output current by compact power surface mount package. ■Applications ●DVD Recorder、FPD TV ●OA equipment, such as a printer ●On-board local power supply ■Key Specifications ■Features SI-8008T M ●1.5A output current by compact power surface mount package. ● High Efficiency 81% (at VIN=15V, Io=0.5A,Vo=5V) ● Requires only four discrete components. (C3: required for soft start.) ●Built-in Oscillation circuit (oscillation frequency : 300kHz (TYP)) ●Constant current type overcurrent protection and overheating protection. ●Soft start function. (ON/OFF function available. Output OFF at Low level.) ● Low consumption current at Output OFF. SI-8033T SI-8050T SI-8120T M M M 3.3V 5.0V 12.0V 76% 81% 87% (ADJ Type) Input Voltage Output Current Output Voltage (REF Voltage) Efficiency (TYP) (5V Set-up) 43V 0 to 1.5A 0.8V 81% Typical Connection C1：220μF C2：470μF C3：1μF (At the time of soft start functional use) L1：47μH Di：SFPB66(Sanken) . Sanken Electric Co.,Ltd. http://www.sanken-ele.co.jp/en/ 1/15 I02-001EA-050910 DC/DC Step-Down Converter IC SI-8000TM Series September 2005 1. Scope The present specifications shall apply to a DC-DC buck converter SI-8008TM. 2. Outline Classification Semiconductor IC (monolithic IC) Structure Plastic package (transfer mold) Applications ・DC voltage regulator ・Power supplies for telecommunication equipment , office equipment etc ,ON-board local regulator ・Output voltage regulator at secondary stage of switch mode power supply 3. Absolute maximum ratings 3-1 Absolute maximum ratings Characteristic Symbol Ratings Units DC input voltage VIN 43 V Power dissipation １ Pd1 １.06 W Power dissipation２ Pd2 1.65 W Junction temperature Tj -40~150 ℃ Remarks Glass‐epoxy board mounting in 900square ㎜, copper area 4.3% Tjmax=125℃ Glass‐epoxy board mounting in 900square ㎜, copper area 50% Tjmax=125℃ Thermal protection circuit is built-in in this product and when junction temperature rises to 130℃ or higher, it may be caused to operate Recommended max. junction temperature at operation is 125℃. Storage temperature Tstg -40～150 ℃ Thermal resistance (junction-case) θj-c ６ ℃/W Thermal resistance (junction-ambient air) θj-a 95 ℃/W Glass‐epoxy board mounting in 900square ㎜, copper area 4.3% . Sanken Electric Co.,Ltd. I02-001EA-050910 2/15 DC/DC Step-Down Converter IC SI-8000TM Series 3-2 September 2005 Recommended operating conditions Ratings Characteristic Symbol DC input voltage range VIN DC output voltage range Vo 0.8～24 V DC output current range Io 0～1.5 A Operating junction temperature range Tjop -40～125 ℃ Operating temperature range Top -40～125 ℃ MIN *1 MAX Vo+3 Units Remarks V Io=0～1.5A 40 *2 VIN≧Vo+3V *2 *1 The minimum value of DC input voltage range is 8V when output is less than 5V, VO+3,when the output is more than 5V.In the case of VIN=Vo+2～Vo+3V , it is set to Io=1A MAX. *2 To be used within the allowable package power dissipation characteristics (refer to P6). 4. Electrical characteristics 4-1 Electrical characteristics (Ta=25℃、Vo=5V adjusted R1=4.2kΩ,R2=0.8kΩ) Characteristic Symbol VADJ Reference voltage Limits MIN TYP MAX 0.784 0.800 0.816 Units V Test conditions VIN=15V，IO=0.1A VIN=15V IO=0.1A,Tc=0~100℃ ， ⊿VREF/⊿T ±0.1 mV/℃ Efficiency *3 η 81 % Operating frequency fo 300 kHz VIN=15V，IO=0.5A Line regulation VLine 60 80 mV VIN=10～30V，IO=0.5A Load regulation VLoad 10 40 mV VIN=15V，IO=0.2～1.5A Reference voltage temperature coefficient IS Over current protection starting current ON/OFF terminal *4 A VSSL Low level voltage Flow-out current level voltage 1.6 at low ISSL 10 Quiescent current 1 Iq 6 Quiescent current 2 Iq(off) 200 VIN=15V,IO=0.5A VIN=15V 0.5 V 40 μA VSSL=0V mA VIN=15V，IO=0A μA VIN=15V VSS=0V 400 Sanken Electric Co.,Ltd. I02-001EA-050910 3/15 DC/DC Step-Down Converter IC SI-8000TM Series *3 September 2005 Efficiency is calculated by the following equation. VO･IO η(%)= VIN･IIN ×100 *4 No.5 terminal is a SS terminal to enable soft start by connecting a capacitor. The output can be turned on and off by using a SS terminal. The output is stopped by decreasing the SS terminal voltage below VSSL and in order to perform ON/OFF operation of Vout, it is required to connect NPN transistor or the output of open collector type TTL between No.5 terminal and GND. In case that both soft and Vout ON/OFF are used, a protection measure such as limitation of current is required, as the discharge current of C3 flows across a transistor for ON/OFF operation, if the capacitance of C3 large. As a pull-up type resistor is provided inside the IC, no external voltage can be applied. In case of no use of ON/OFF, please keep it open. SI-8000TM SI-8000TFE 5 SI-8000TM SI-8000TFE SI-8000TM SI-8000TFE SS 5 SS 5 C3 Soft start +VO.ON/OFF Typical characteristics (Ta=25℃) （１）Efficiency Efficiency SI-8008TM Efficiency Curve Efficiency SI-8008TM／TFE 効率特性 Efficincy Curve Vo=5V Adjusted：R1=4.2kOhm, Ta=25℃ Vo=5v設定時 Vo=5V adjusted：R2=0.8kOhm R1=4 2kΩ R2=0 8kΩ 85 80 効率 % Efficiency η (%) 4-2 C3 Soft start VO.ON/OFF SS 75 70 VIN= 8v,10v,15v,20v,30v, 40v 65 60 55 0 0.5 1 1.5 Iout A Sanken Electric Co.,Ltd. I02-001EA-050910 4/15 DC/DC Step-Down Converter IC SI-8000TM Series September 2005 □ Output Voltage: 5V Adjusted (R2=0.8k[Ohm]) (2) Low Voltage Behavior (5) Quiescent Current 10 5 Quiescent Current[mA] Output Voltage VO [V] 6 ４ 3 IO=0A、 0.1A 0.5A 1.0A 1.5A 2 1 8 Io=0A 6 4 2 5.06 5.04 5.02 2 4 6 入力電圧 VIN [V] (3) Load Regulation 8 0 10 20 30 入力電圧 VIN [V] (6) Thermal Protection 6 10 Output Voltage VO [V] Output Voltage VO [V] 0 VIN=40V 30V 5.00 4.98 20V 15v 4.96 10V 4.94 4.92 8V 4.90 4.88 40 5 4 VIN=8V 3 Io=0.01A 2 1 4.86 4.84 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 Output Current IO [A] TSD OFF 1.6 0 Circuit Current at Output OFF[uA] 400 (4) Circuit Current at Output OFF 300 20 TSD ON 40 60 80 100 120 140 160 180 Junction Temperature Tj [℃] Vss=0V 200 100 0 10 20 30 40 Input Voltage VIN [V] Sanken Electric Co.,Ltd. I02-001EA-050910 5/15 DC/DC Step-Down Converter IC SI-8000TM Series September 2005 4-2 Power Dissipation SI-8000TM Series Power Dissipation ⎛ 100 ⎞ ⎛ V − 1⎟⎟ − V F ⋅ I O ⎜⎜1 − O PD = VO ⋅ I O ⎜⎜ ⎝ ηx ⎠ ⎝ V IN Tjmax=125℃ Glass‐epoxy board mounting in 30×30 ㎜ copper area copper area ⎞ ⎟⎟ ⎠ VO: Output voltage VIN: Input voltage IO: Output current ηx: Efficiency（％） VF: Diode forward voltage SFPB66･･0.5V (IO=1.5A) Power Dissipation Pd [W] copper area copper area copper area copper area Ambient Temperature Ta [℃] Note1：As the efficiency varies subject to the input voltage and output current, it shall be obtained from the efficiency curve in page 4 and substituted in percent. Note2：Thermal design for Di shall be made separately. Sanken Electric Co.,Ltd. I02-001EA-050910 6/15 DC/DC Step-Down Converter IC SI-8000TM Series September 2005 Reference data SI-8000TM Copper area on PC board vs. thermal resistance. SI-3000KM/KMS 銅箔面積ー熱抵抗 Area of PC board：30×30mm 100 θj-a （℃/W） 90 80 70 60 50 40 10 100 1000 2 Copper area on PC board （ｍｍ 銅箔面積 （㎜ ） 2） 許容損失Pd (W） Power Dissipation Pd [W] Copper area on PC board vs. Power dissipation 銅箔面積－許容損失Tjmax=100℃ Tj=100℃ Area of PC board：30×30mm 1.5 Ta=25℃ 40℃ 1 60℃ 0.5 85℃ 0 10 100 Copper area銅箔面積 （㎜2） on PC board （ｍｍ2） 1000 ・Calculation of junction temperature The junction temperature can be obtained from the following equation using the Tc that is measured by thermocouple. Tj = PD × θj − C + TC Tc measurement point (θj-ｃ＝6℃／W) ● 5. Block diagram (Connection diagram) Sanken Electric Co.,Ltd. I02-001EA-050910 7/15 DC/DC Step-Down Converter IC SI-8000TM Series September 2005 SI-8008TM Vin 1 C1 SS ON/ OFF Soft･ Start C3 L 2 Latch & Driver Reset VO C2 Di Over Current Protection PReg 5 SW IN R1 Oscillator Comparator Thermal Protection ADJ 4 Error Amp R2 Reference Voltage GND 3 Di：SFPB66(made by sanken) Recommended pattern The example of the solder pattern. 6.0 GND 8000TM C1 C2 6.1 C3 ＋ ＋ R1 IN SW R2 Di 2.4 Vout 5.88 2.5 L 1.27 0.47 0.8 *The circuit board layout is recommended as follows: ①Other components are connected as close as possible to the SI-8008TM. ②Each ground of all components is connected at one point area. 6. Example application circuit Sanken Electric Co.,Ltd. I02-001EA-050910 8/15 DC/DC Step-Down Converter IC SI-8000TM Series September 2005 6-1 Standard circuit diagram 1 VIN IN SW SI-8008TM C1 220uF SS 5 GND 3 ADJ 4 C1：220μF L 47uH 2 VO R1 Di C2：470μF C3：1μF R2 IADJ C3 C2 470uF L1：47μH GN D GND (If soft start function is used) Di：SFPB66 (Made by Sanken) Diode Ｄｉ ・The shottky-barrier diode must be used for Di. If other diodes like fast recovery diodes are used, IC may be destroyed because of the reverse voltage applied by the recovery voltage or ON voltage. Choke coil Ｌ1 ・If the winding resistance of the choke coil is too high, the efficiency may go down to the extent that it is out of the rating. ・As the overcurrent protection start current is approx. 2.5A, attention must be paid to the heating of the choke coil by the magnetic saturation due to overload or short-circulated load. Capacitor Ｃ1，Ｃ2，Ｃ3 ・As large ripple currents flow across C1 and C2, capacitors with high frequency and low impedance for SMPS must be used. Especially when the impedance of C2 is high, the switching waveform may not be normal at low temperature. Please use neither OS capacitor nor tantalum capacitor which causes an abnormal oscillation for the C2. ・C3 is a capacitor for soft start. In case soft start function is not used, please keep No.5 terminal open. A pull-up resistor is provided inside the IC. Resister R1，R2 ・R1，R2 is resistor to the Output Voltage. IADJ set to become 1mA. Moreover, R1，R2 is calculated by the following expression. (V − VADJ ) = (VOUT − 0.8) (Ω)，R2 = VADJ = 0.8 ≒ 0.8k (Ω) R1 = OUT I ADJ 1 × 10− 3 I ADJ 1 × 10−3 ◎In order to have optimum operating condition, each component must be laid out with the minimum distance. Sanken Electric Co.,Ltd. I02-001EA-050910 9/15 DC/DC Step-Down Converter IC SI-8000TM Series September 2005 7 Package information 7-1 Package type and dimensions ８００８ＴＭ*1 *2 *3 ＳＫ １ ２ 0.1 *4 ３ ４ ５ *1 Type No *2 Logo mark Pin assignment 1：IN *3 Lot Number Products Weight：Approx.0.33g 1st letter：The last digit of year 2nd letter：Month 2：SW 3：GND 1 to 9 for Jan. to Sept. 4：ADJ O for Oct. N for Nov. D for Dec. 3rd letter：week(Arabic Numerical) 5：SS *4 Administer number (four digit) 7-2 Appearance The body shall be clean and shall not bear any stain, rust or flaw. 7-3 Marking The type number and lot number shall be clearly stamped by laser on the body so that they cannot be erased easily. Sanken Electric Co.,Ltd. I02-001EA-050910 10/15 DC/DC Step-Down Converter IC SI-8000TM Series September 2005 8. Packing specifications 4.0±0.1 φ1.5 2.0±0.1 0.3 Unit：mm 0.3 1.7 10.5 7.50 16.0 0.25 8.0 φ1.7 B Direction of Reel 7.1 B:MIN 1.60 2.65 D W1 +2 W2 MAX -0 16.4 ㎜ W1 C C:13.0±0.5 +3 -0.5 22.4 ㎜ 16.4 ㎜ Quantity：3000pcs／reel Sanken Electric Co.,Ltd. I02-001EA-050910 11/15 DC/DC Step-Down Converter IC SI-8000TM Series September 2005 9. Cautions and warnings 9-1 Parallel operation The parallel operation to increase the current is not available. 9-2 Thermal protection The SI-8000TM series has a thermal protection circuit. This circuit keeps the IC from the fever by the over load. But this circuit cannot guarantee the long-term reliability against the continuously over load status. Sanken Electric Co.,Ltd. I02-001EA-050910 12/15 DC/DC Step-Down Converter IC SI-8000TM Series September 2005 <Worldwide Contacts> Asia Pacific China Sanken Electric Hong Kong Co., Ltd. Suite 1026 Ocean Centre, Canton Road, Tsimshatsui, Kowloon, Hong Kong Tel: 852-2735-5262 Fax: 852-2735-5494 Sanken Electric (Shanghai) Co., Ltd. Room3202, Maxdo Centre, Xingyi Road 8, Changning district, Shanghai, China Tel: 86-21-5208-1177 Fax: 86-21-5208-1757 India Saket Devices Pvt. Ltd. Office No.25, 2nd Floor, Bandal - Dhankude Plaza, Near PMT Depot, Paud Road, Kothrud, Pune - 411 038, India Tel: 91-20-5621-2340 Fax: 91-20-2528-5459 Japan Sanken Electric Co., Ltd. Overseas Sales Headquaters Metropolitan Plaza Bldg. 1-11-1 Nishi-Ikebukuro, Toshima-ku, Tokyo 171-0021, Japan Tel: 81-3-3986-6164 Fax: 81-3-3986-8637 Korea Sanken Electric Korea Co., Ltd. Mirae Asset Life Bldg. 6F, 168 Kongduk-dong, Mapo-ku, Seoul, 121-705, Korea Tel: 82-2-714-3700 Fax: 82-2-3272-2145 Singapore Sanken Electric Singapore Pte. Ltd. 150 Beach Road, #14-03 The Gateway West, Singapore 189720 Tel: 65-6291-4755 Fax: 65-6297-1744 Taiwan Taiwan Sanken Electric Co., Ltd. Room 1801, 18th Floor, 88 Jung Shiau East Road, Sec. 2, Taipei 100, Taiwan R.O.C. Tel: 886-2-2356-8161 Fax: 886-2-2356-8261 Sanken Electric Co.,Ltd. I02-001EA-050910 13/15 DC/DC Step-Down Converter IC SI-8000TM Series September 2005 Europe France Allegro MicroSystems Europe Les Pleiades, Park Nord Annecy, 74370 Metz-Tessy, France Tel: 33-450512359 Fax: 33-450512083 United Kingdom Allegro MicroSystems Europe Limited Balfour House, Churchfield Road, Walton-on-Thames, Surrey KT12 2TD, U.K. Tel: 44-1932-253355 Fax: 44-1932-246622 North America United States Allegro MicroSystems, Inc. 115 Northeast Cutoff, Worcester, Massachusetts 01606, U.S.A. Tel: 1-508-853-5000 Fax: 1-508-853-3353 Allegro MicroSystems, Inc. (Southern California) 14 Hughes Street, Suite B105, Irvine, CA 92618 Tel: 1-949-460-2003 Fax: 1-949-460-7837 Sanken Electric Co.,Ltd. I02-001EA-050910 14/15 DC/DC Step-Down Converter IC SI-8000TM Series September 2005 CAUTION / WARNING ●The information in this publication has been carefully checked and is believed to be accurate; however, no responsibility is assumed for inaccuracies. ● Sanken reserves the right to make changes without further notice to any products herein in the interest of improvements in the performance, reliability, or manufacturability of its products. Before placing an order, Sanken advises its customers to obtain the latest version of the relevant information to verify that the information being relied upon is current. ● Application and operation examples described in this catalog are quoted for the sole purpose of reference for the use of the products herein and Sanken can assume no responsibility for any infringement of industrial property rights, intellectual property rights or any other rights of Sanken or any third party which may result from its use. ● When using the products herein, the applicability and suitability of such products for the intended purpose or object shall be reviewed at the users’ responsibility. ● Although Sanken undertakes to enhance the quality and reliability of its products, the occurrence of failure nd defect of semiconductor products at a certain rate is inevitable. Users of Sanken products are requested to take, at their own risk, preventative measures including safety design of the equipment or systems against any possible injury, death, fires or damages to the society due to device failure or malfunction. ● Sanken products listed in this catalog are designed and intended for the use as components in general purpose electronic equipment or apparatus (home appliances, office equipment, telecommunication equipment, measuring equipment, etc.). Before placing an order, the user’s written consent to the specifications is requested. When considering the use of Sanken products in the applications where higher reliability is required (transportation equipment and its control systems, traffic signal control systems or equipment, fire/crime alarm systems, various safety devices, etc.), please contact your nearest Sanken sales representative to discuss and obtain written confirmation of your specifications. The use of Sanken products without the written consent of Sanken in the applications where extremely high reliability is required (aerospace equipment, nuclear power control systems, life support systems, etc.) is strictly prohibited. ● Anti radioactive ray design is not considered for the products listed herein. ● This publication shall not be reproduced in whole or in part without prior written approval from Sanken. ●This is notification that you, as purchaser of the products/technology, are not allowed to perform any of the following: 1. Resell or retransfer these products/technology to any party intending to disturb international peace and security. 2. Use these products/technology yourself for activities disturbing international peace and security. 3. Allow any other party to use these products/technology for activities disturbing international peace and security. Also, as purchaser of these products/technology, you agree to follow the procedures for the export or transfer of these products/technology, under the Foreign Exchange and Foreign Trade Law, when you export or transfer the products/technology abroad. Sanken Electric Co.,Ltd. I02-001EA-050910 15/15