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DC/DC Step-Down Converter IC
SI-8000TM Series
General Descriptions
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.
September 2005
Package---TO252-5
Applications
DVD RecorderFPD TV OA equipment, such as a printer On-board local power supply
Key Specifications
SI-8008T M
(ADJ Type) Input Voltage Output Current Output Voltage Efficiency (TYP)
Features
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 M 43V
SI-8050T M
SI-8120T M
0 to 1.5A 0.8V
(REF Voltage)
3.3V 76%
5.0V 81%
12.0V 87%
81%
(5V Set-up)
Typical Connection
C1220F C2470F C31F
(At the time of soft start functional use)
L147H DiSFPB66(Sanken)
.
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DC/DC Step-Down Converter IC
SI-8000TM Series
1. Scope
The present specifications shall apply to a DC-DC buck converter SI-8008TM.
September 2005
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 DC input voltage Power dissipation
Symbol VIN Pd1
Ratings 43 .06
Units V W
Remarks
Power dissipation
Pd2
1.65
W
Glassepoxy board mounting in 900square , copper area 4.3% Tjmax=125 Glassepoxy board mounting in 900square , copper area 50% Tjmax=125
Junction temperature
Tj
-40~150
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 Thermal resistance (junction-case) Thermal resistance (junction-ambient air) Tstg j-c j-a -40150 95 /W /W Glassepoxy board mounting in 900square , copper area 4.3%
.
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DC/DC Step-Down Converter IC
SI-8000TM Series
3-2 Recommended operating conditions
Characteristic DC input voltage range DC output voltage range DC output current range Operating junction temperature range Operating temperature range Symbol VIN Vo Io Tjop Top *1 Ratings MIN Vo+3 0.824 01.5 -40125 -40125 MAX 40 Units V V A
September 2005
Remarks Io=01.5A
*2 VINVo+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+2Vo+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=25Vo=5V adjusted R1=4.2k,R2=0.8k)
Characteristic Reference voltage Reference voltage temperature coefficient Efficiency *3 Operating frequency Line regulation Load regulation Over current protection starting current ON/OFF terminal *4 Low level voltage Flow-out current level voltage at low Symbol Limits
MIN 0.784
TYP 0.800 0.1 81 300 60 10
MAX 0.816
Units
Test conditions
VIN=15VIO=0.1A VIN=15V IO=0.1A,Tc=0~100 VIN=15V,IO=0.5A VIN=15VIO=0.5A VIN=1030VIO=0.5A VIN=15VIO=0.21.5A VIN=15V
VADJ
VREF/T
V mV/ % kHz
fo
VLine VLoad IS VSSL ISSL Iq Iq(off) 1.6
80 40
mV mV A
0.5 10 6 200 400 40
V A mA A VSSL=0V VIN=15VIO=0A VIN=15V VSS=0V
Quiescent current 1 Quiescent current 2
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DC/DC Step-Down Converter IC
SI-8000TM Series
*3 Efficiency is calculated by the following equation. VOIO (%)= VINIIN x100
September 2005
*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 SI-8000TM SI-8000TFE SI-8000TM SI-8000TFE
5
SS
5
SS C3
5
SS C3
VO.ON/OFF
4-2
Soft start
Soft start +VO.ON/OFF
Typical characteristics (Ta=25) Efficiency
Efficiency SI-8008TM Efficiency Curve Efficiency SI-8008TMTFE Efficincy Curve Vo=5V AdjustedR1=4.2kOhm, R2=0.8kOhm Ta=25Vo=5v Vo=5V adjustedR1=4 2k R2=0 8k
85 80
Efficiency (%)
%
75 70 65 60 55 0 0.5 IoutA 1 1.5
VIN= 8v,10v,15v,20v,30v, 40v
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DC/DC Step-Down Converter IC
SI-8000TM Series
Output Voltage: 5V Adjusted (R2=0.8k[Ohm]) 6 Output Voltage VO [V]
(2) Low Voltage Behavior (5) Quiescent Current
September 2005
10
Quiescent Current[mA]
5 3 2 1 0
2 4 6
IO=0A 0.1A 0.5A 1.0A 1.5A
8 6 4 2
Io=0A
Output Voltage VO [V]
5.00 4.98 4.96 4.94 4.92 4.90 4.88 4.86 4.84 0 0.2 0.4
VIN=40V 30V 20V 15v 10V 8V
Output Voltage VO [V]
5.06 5.04 5.02
VIN [V] (3) Load Regulation
8
10
0
10 20 30 VIN [V] (6) Thermal Protection 6 5 4 3 2 1
TSD OFF
40
VIN=8V Io=0.01A
Output Current
0.6
0.8 1.0 1.2 1.4
IO [A]
1.6
TSD ON
0
400 (4) Circuit Current at Output OFF
Circuit Current at Output OFF[uA]
Junction Temperature Tj []
20
40 60 80 100 120 140 160 180
300
Vss=0V
200
100
0
10
20
30
40
Input Voltage VIN [V]
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DC/DC Step-Down Converter IC
SI-8000TM Series
4-2 Power Dissipation
September 2005
SI-8000TM Series Power Dissipation
Tjmax=125
100 VO PD = VO I O - 1 - V F I O 1 - V IN x

Glassepoxy board mounting in 30x30
copper area copper area
VO: Output voltage VIN: Input voltage IO: Output current x: Efficiency VF: Diode forward
voltage
SFPB660.5V (IO=1.5A)
copper area copper area
Power Dissipation Pd [W]
copper area
copper area
Ambient Temperature Ta []
Note1As 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. Note2Thermal design for Di shall be made separately.
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DC/DC Step-Down Converter IC
SI-8000TM Series
Reference data
Area of PC board30x30mm
September 2005
SI-8000TM Copper area on PC board vs. thermal resistance.
SI-3000KM/KMS
100 90
j-a/W
80 70 60 50 40
10 100
Copper area on PC board 2
2
1000
Copper area on PC board vs. Power dissipation
Power Dissipation Pd [W]
Tjmax=100 Tj=100 Area of PC board30x30mm
1.5 1 0.5
85 Ta=25 40 60
Pd(W
0 10 100 2 Copper area on PC board 2 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 x j - C + TC
(j-6W)
Tc measurement point
5. Block diagram (Connection diagram)
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DC/DC Step-Down Converter IC
SI-8000TM Series
SI-8008TM
Vin C1
September 2005
1
IN PReg Over Current Protection Reset Oscillator Comparator
Thermal Protection
SW
2
Di
L C2
VO
5
C3
SS
ON/ OFF Soft Start
Latch & Driver
R1
ADJ 4
R2
Error Amp Reference Voltage
GND 3
DiSFPB66(made by sanken) Recommended pattern The example of the solder pattern.
6.0
GND
C1
8000TM C2 C3
6.1
IN SW Di R1 R2
Vout
2.4
5.88
2.5
L
1.27
0.47
0.8
*The circuit board layout is recommended as follows: Other components are connected as close as possible to the SI-8008TM. Each ground of all components is connected at one point area. 6. Example application circuit
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DC/DC Step-Down Converter IC
SI-8000TM Series
6-1 Standard circuit diagram
1 VIN IN SW 2 L 47uH VO R1 Di R2 IADJ C2 470uF GN D
September 2005
C1220F C2470F C31F
(If soft start function is used)
SI-8008TM
C1 220uF SS 5 C3 GND GND 3 ADJ 4
L147H DiSFPB66
(Made by Sanken)
Diode 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 1 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 123 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. is a capacitor for soft start. In case soft start function is not used, please keep No.5 terminal open. C3 A pull-up resistor is provided inside the IC. Resister R1R2 R1R2 is resistor to the Output Voltage. IADJ set to become 1mA. Moreover, R1R2 is calculated by the following expression. (V - VADJ ) = (VOUT - 0.8) ()R2 = VADJ = 0.8 0.8k () R1 = OUT I ADJ 1 x 10- 3 I ADJ 1 x 10-3
In order to have optimum operating condition, each component must be laid out with the minimum distance.
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DC/DC Step-Down Converter IC
SI-8000TM Series
7 Package information
7-1 Package type and dimensions
September 2005
*1
*2
*4
*3
0.1
*1 Type No
*2 Logo mark Pin assignment 1IN 2SW 3GND 4ADJ 5SS *3 Lot Number
Products Weight Approx.0.33g
1st letterThe last digit of year 2nd letterMonth 1 to 9 for Jan. to Sept. O for Oct. N for Nov. D for Dec. 3rd letterweek(Arabic Numerical) *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.
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DC/DC Step-Down Converter IC
SI-8000TM Series
8. Packing specifications
4.00.1 1.5 0.3 2.00.1 1.7 7.50 10.5 0.3
September 2005
Unitmm
16.0 0.25 8.0 1.7 7.1 2.65 D C C:13.00.5 Direction of Reel B B:MIN 1.60
W1
+2 -0
W2 MAX 22.4
W1
+3 -0.5
16.4 Quantity3000pcsreel
16.4
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DC/DC Step-Down Converter IC
SI-8000TM Series
9. Cautions and warnings
9-1 Parallel operation The parallel operation to increase the current is not available.
September 2005
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.
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DC/DC Step-Down Converter IC
SI-8000TM Series
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
September 2005
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
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DC/DC Step-Down Converter IC
SI-8000TM Series
Europe
France
Allegro MicroSystems Europe Les Pleiades, Park Nord Annecy, 74370 Metz-Tessy, France Tel: 33-450512359 Fax: 33-450512083
September 2005
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
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DC/DC Step-Down Converter IC
SI-8000TM Series
CAUTION / WARNING
September 2005
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.
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