SI8005Q-TL [SANKEN]

Step-Down Switching Regulator with Current-Mode Control; 降压型开关稳压器具有电流模式控制
SI8005Q-TL
型号: SI8005Q-TL
厂家: SANKEN ELECTRIC    SANKEN ELECTRIC
描述:

Step-Down Switching Regulator with Current-Mode Control
降压型开关稳压器具有电流模式控制

稳压器 开关式稳压器或控制器 电源电路 开关式控制器 光电二极管
文件: 总12页 (文件大小:1071K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
SI-8005Q  
Step-Down Switching Regulator with Current-Mode Control  
Features and Benefits  
Description  
Current-mode control system employed  
Excellent line regulation (60 mV maximum)  
165 mmaximum on-resistance of built-in MOSFET  
Output current 3.5 A  
Wide range of input voltages (4.75 to 28 V), supports 24  
V direct drive  
Output voltage 0.5 to 24 V, compatible with various IC  
power supply voltages, through low VREF of 0.5 V.  
High efficiency, 94% maximum at VIN = 8 V, VO = 5 V,  
and IO = 0.5 A  
Operating frequency 500 kHz, supports downsizing of  
smoothing choke coil  
TheSI-8005Qisastep-downswitchingregulatorIC,designedas  
anoutputvoltageregulatoratthesecondarystageofswitchmode  
powersupplies.Thecurrent-modecontrolsystempermitssmall  
ceramic capacitors to be used as output capacitors. Together  
with the compact HSOP8 package, this allows reduction of  
regulator circuitry area on the PCB by approximately 50% in  
comparison with conventional topologies.  
Designed to save power, losses in the SI-8005Q are reduced  
by controlling the maximum on-resistance of a built-in output  
MOSFETtoaslowas165mΩ.Furthermore,dieminiaturization  
has been accomplished through a proprietary BCD process.  
Soft start and output on/off functions built-in  
Built-in protection:  
TheSI-8005Qsuppliesanoutputcurrentof3.5 Aandanoutput  
voltage that is variable from 0.5 to 24 V, which is easily set to  
a voltage compatible with the diverse reduced power supply  
voltages required by signal processing ICs. Accepting a wide  
input voltage range, from 4.75 to 28 V, the SI-8005Q can be  
driven directly by a 24 V power supply.  
Drooping overcurrent protection  
Overtemperature protection  
Undervoltage lockout (UVLO)  
Package: HSOP8 surface mount with  
exposed thermal pad  
Applications include power supplies for signal processing ICs  
formemoriesandmicrocomputersusedinplasmadisplaypanel  
(PDP) TVs, liquid crystal display (LCD) TVs, computer hard  
drives, and DVD recorders.  
Not to scale  
Functional Block Diagram  
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27469.058  
Step-Down Switching Regulator with Current-Mode Control  
SI-8005Q  
Selection Guide  
Part Number  
Packing  
1000 pieces per reel  
SI8005Q-TL  
Absolute Maximum Ratings  
Characteristic  
Symbol  
VIN  
Remarks  
Rating  
Unit  
V
DC Input Voltage  
30  
6
DC Input Voltage  
VEN  
V
Limited by internal thermal shutdown, mounted on a 30 mm × 30 mm  
glass epoxy PCB with 25 mm × 25 mm exposed copper area,  
TJ(max) = 125°C  
Allowable Power Dissipation  
PD  
TJ  
1.35  
W
Junction Temperature  
Storage Temperature  
Internal thermal shutdown activates at approximately 140°C  
–30 to 150  
–40 to 150  
°C  
°C  
T
stg  
Mounted on a 30 mm × 30 mm glass epoxy PCB with 25 mm ×  
25 mm exposed copper area  
Thermal Resistance (Junction to Ambient)  
Thermal Resistance (Junction to Case)  
RθJA  
RθJC  
74  
40  
°C/W  
°C/W  
Recommended Operating Conditions*  
Characteristic  
Symbol  
Remarks  
Min.  
Typ.  
Max.  
Units  
VIN(min) is the greater of either 4.75 V or VO+1 V; except  
if VO + 0.5 VIN VO +1 V, then VIN(min) is set such that  
IO 2 A  
See  
remarks  
DC Input Voltage Range  
VIN  
28  
V
Using the circuit defined in the Typical Application  
diagram and within PD limits  
DC Output Current Range  
IO  
0
3.5  
125  
85  
A
Operating Junction  
Temperature Range  
TJOP  
TOP  
–30  
–30  
°C  
°C  
Operating Temperature  
Range  
Operation within PD limits  
*Recommended operating range indicates conditions which are required for maintaining normal circuit functions shown in the Electrical Characteristics  
table.  
Maximum Allowable Package Power Dissipation  
Results calculated as:  
1.6  
VO  
100  
Hx  
VF × IO  
1 –  
PD V × I  
1  
=
1.4  
1.2  
1.0  
0.8  
0.6  
0.4  
0.2  
0
O
O
V
IN  
where:  
VO is the output voltage,  
VIN is the Input voltage (0.4 V for these results),  
O is the Output current (0.3 A for these results),  
I
ηx is the efficiency (%), which varies with VIN and IO (derived from the  
Efficiency curves in the Characteristic Performance section), and  
–25  
0
25  
50  
75  
100  
125  
VF is the diode forward voltage for D1, determination of the value for D1  
should be made based on testing with the actual application (Sanken  
diode SJPB-D4 was used for these results).  
Ambient Temperature, TA (°C)  
All performance characteristics given are typical values for circuit or  
system baseline design only and are at the nominal operating voltage and  
an ambient temperature, TA, of 25°C, unless otherwise stated.  
Allegro MicroSystems, Inc.  
115 Northeast Cutoff, Box 15036  
2
Worcester, Massachusetts 01615-0036 (508) 853-5000  
www.allegromicro.com  
Step-Down Switching Regulator with Current-Mode Control  
SI-8005Q  
ELECTRICAL CHARACTERISTICS1, valid at TA=25°C, unless otherwise noted  
Characteristics  
Reference Voltage  
Symbol  
Conditions  
VIN = 12 V, IO = 1.0 A  
Min  
Typ  
Max  
Units  
VREF  
0.485  
0.500  
0.515  
V
Output Voltage Temperature  
Coefficient  
VREF/T  
VIN = 12 V, IO = 1.0 A, TA = –40°C to 85°C  
±0.05  
mV/°C  
Efficiency2  
η
fO  
VIN = 12 V, VO = 5 V, IO = 1 A  
VIN = 16 V, VO = 5 V, IO = 1 A  
VIN = 8 to 28 V, VO = 5 V, IO = 1 A  
VIN = 12 V, VO = 5 V, IO = 0.1 to 3.5 A  
VIN = 12 V, VO = 5 V  
450  
90  
500  
10  
10  
550  
60  
60  
6.0  
%
kHz  
mV  
mV  
A
Operating Frequency  
Line Regulation  
VLINE  
VLOAD  
IS  
Load Regulation  
Overcurrent Protection Threshold  
Quiescent Current 1  
3.6  
IIN  
VIN = 12 V, VO = 5 V, IO = 0 A, VEN = open  
VIN = 12 V, VO = 5 V, IO = 0 A,VEN = 0 V  
VSSL = 0 V, VIN = 16 V  
18  
mA  
μA  
A  
V
Quiescent Current 2  
IIN(off)  
ISSL  
VCEH  
VCEL  
ICEH  
AEA  
GEA  
20  
SS Terminal Leakage Current3  
EN Terminal High Level Voltage  
EN Terminal Low Level Voltage  
EN Terminal Leakage Current  
Error Amplifier Voltage Gain  
Error Amplifier Transconductance  
5
VIN = 12 V  
2.8  
VIN = 12 V  
2.0  
V
VEN = 0 V  
1
A  
V/V  
μA/V  
1000  
800  
Current Sense To COMP  
Transimpedance  
1/GCS  
0.35  
V/A  
Maximum Duty Cycle (On)  
Minimum On-Time  
DCMAX  
tMIN  
92  
%
100  
ns  
1Using circuit shown in Measurement Circuit diagram.  
2Efficiency is calculated as: η(%) = ([VO × IO] × [VIN × IIN]) × 100.  
3SS terminal enables soft start when a an external capacitor is connected to it. Because a pull-up resistor is provided inside the IC, no external voltage  
can be applied to this terminal.  
Measurement Circuit Diagram  
1
C4  
2
L1  
Component  
Rating  
3
I N  
7
8
BS  
SI-8005Q  
SW  
FB  
C1  
C2  
C3  
C4  
Di  
L1  
R1  
R2  
R3  
22 F / 50 V  
47 F / 25 V  
220 pF / 10 V  
10 nF / 25 V  
SPB-G56S  
10 H  
46 kΩ  
5.1 kΩ  
62 kΩ  
EN  
SS  
Di  
R1  
R2  
IO  
C1  
C2  
5
IIN  
IEN  
ISS  
G ND  
CO M P  
VFB  
VO  
RL  
4
6
VIN  
VEN  
VSS  
C3  
R3  
Allegro MicroSystems, Inc.  
3
115 Northeast Cutoff, Box 15036  
Worcester, Massachusetts 01615-0036 (508) 853-5000  
www.allegromicro.com  
Step-Down Switching Regulator with Current-Mode Control  
SI-8005Q  
Performance Characteristics  
at TA = 25°C  
100  
90  
80  
70  
60  
50  
40  
100  
8V  
12 V  
90  
V
IN  
4.75V  
5 V  
80  
70  
60  
50  
40  
16 V  
24V  
Efficiency versus  
Output Current  
VO = 1.2 V  
Efficiency versus  
Output Current  
VO = 3.3 V  
28V  
VIN  
6V  
8V  
12V  
0
1
2
3
4
5
0
1
2
3
4
5
IO (A)  
IO (A)  
100  
90  
80  
70  
60  
50  
40  
100  
90  
80  
70  
60  
50  
40  
8V  
12 V  
16 V  
16 V  
V
20V  
28V  
20V  
28V  
VIN  
Efficiency versus  
Output Current  
VO = 5 V  
Efficiency versus  
Output Current  
VO = 12 V  
IN  
0
1
2
3
4
5
0
1
2
3
4
5
IO (A)  
IO (A)  
Allegro MicroSystems, Inc.  
115 Northeast Cutoff, Box 15036  
4
Worcester, Massachusetts 01615-0036 (508) 853-5000  
www.allegromicro.com  
Step-Down Switching Regulator with Current-Mode Control  
SI-8005Q  
Performance Characteristics  
at TA = 25°C  
6
5
4
3
2
1
0
6
0 A  
5
1 A  
8V  
20V  
2 A  
12 V  
4
3
2
1
0
24V  
28V  
3 A  
15 V  
Overcurrent  
Protection  
Load = CR  
Overcurrent  
Protection  
IO  
VIN  
0
0
0
0
2
4
6
VIN (V)  
8
10  
0
1
2
3
4
5
6
IO (A)  
5.05  
5.04  
5.03  
5.02  
5.01  
5.00  
4.99  
4.98  
4.97  
4.96  
4.95  
25  
V
20  
15  
10  
5
IN  
28V  
20V  
15 V  
Load  
Regulation  
Quiescent  
Current versus  
Input Voltage  
12 V  
IO = 0 A  
8V  
0
1
2
3
4
5
0
10  
20  
30  
40  
IO (A)  
VIN (V)  
6
5
4
3
2
1
0
10  
9
8
7
6
5
4
3
2
1
0
OTP On  
Quiescent  
Current versus  
Input Voltage  
Overvoltage  
Protection  
VIN = 12 V  
V
EN = 0 V  
IO = 0 A  
OTP Off  
130  
120  
140  
J (°C)  
150  
160  
10  
20  
30  
40  
T
VIN (V)  
550  
540  
530  
520  
510  
500  
490  
480  
470  
460  
450  
550  
540  
530  
520  
510  
500  
490  
480  
470  
460  
450  
8V  
12 V  
V
IN  
15 V  
Operating  
Frequency versus  
Output Current  
Operating  
Frequency versus  
Input Voltage  
20V  
24V  
28V  
1
2
3
4
5
0
10  
20  
VIN (V)  
30  
40  
IO (A)  
Allegro MicroSystems, Inc.  
115 Northeast Cutoff, Box 15036  
5
Worcester, Massachusetts 01615-0036 (508) 853-5000  
www.allegromicro.com  
Step-Down Switching Regulator with Current-Mode Control  
SI-8005Q  
Component Selection  
C5 is used to enable soft start. If the soft start function is not  
used, leave the SS terminal open.  
Diode Di A Schottky-barrier diode must be used for Di. If other  
diode types, such as like fast recovery diodes, are used, the IC  
may be destroyed because of reverse voltages applied by the  
recovery voltage or turn-on voltage.  
Resistors R1 and R2 R1 and R2 set the output voltage, VO.  
Select the resistor values to set IADJ to 0.1 mA. R1 and R2 are  
calculated by the following expression:  
Choke Coil L1 If the winding resistance of the choke coil is too  
high, IC efficiency may go down to the extent that the resistance  
is beyond the rating. Because the overcurrent protection threshold  
current is approximately 4 A, attention must be paid to the heat-  
ing of the choke coil by magnetic saturation due to overload or  
short-circulated load.  
(
V
O
VFB )= (VO 0.5  
)
V
FB  
0.5  
0.1×103  
R1 =  
(
Ω
)
R2 =  
=
5k  
Ω
( )  
0.1×103  
IADJ  
IADJ  
For optimum performance, minimize the distance between com-  
ponents.  
Capacitors C1, C2, and C5 Because large ripple currents for  
SMPS flow across C1 and C2, capacitors with high frequency  
and low impedance must be used. Especially when the impedance  
of C2 is high, the switching waveform may not be normal at low  
temperatures.  
Phase Compensation Components C3, C6, and R3 The  
stability and response of the loop is controlled through the COMP  
pin. The COMP pin is the output of the internal transconductance  
Typical Application Diagram  
VIN  
Component  
Rating  
Manufacturer  
VO  
5 V  
C4  
2
1
BS  
L1  
C1 (2 ea)  
C2 (2 ea)  
C3  
C4, C5  
Di  
10 F / 50 V  
22 F / 16 V  
220 pF  
Murata, P/N GRM55DB31H106KA87  
Murata, P/N GRM32ER71A226KE20  
Murata, P/N GRM18 series  
Murata, P/N GRM18 series  
Sanken, P/N SPB-G56S or SJPB-L4  
IN  
SW  
FB  
7
8
3
5
EN  
SI-8005Q  
R1  
C1  
10 nF  
VFB  
SS  
Di  
C2  
C O M P  
G ND  
4
R2  
L1  
R1  
R2  
R3  
10 H  
46 kΩ  
5.1 kΩ  
62 kΩ  
6
C5  
C3  
IADJ  
C6  
O PEN  
R3  
G ND  
G ND  
Recommended PCB Layout  
Recommended Solder Pad Layout  
R3  
FB  
Unti: m m  
4.30  
1.35  
C6  
COMP  
C3  
R1  
R2  
EN  
SS  
C5  
GND  
C2  
U1  
C1  
Vin  
C4  
Vout  
D1  
Vsw  
L1  
2.80  
All external components should be mounted as closely as possible to the  
SI-8005Q. The ground of all components should be connected at one point.  
The exposed copper area on the PCB that is connected to the heat sink  
on the reverse side of package is ground. Enlarging the PCB copper area  
enhances thermal dissipation from the package.  
Allegro MicroSystems, Inc.  
115 Northeast Cutoff, Box 15036  
6
Worcester, Massachusetts 01615-0036 (508) 853-5000  
www.allegromicro.com  
Step-Down Switching Regulator with Current-Mode Control  
SI-8005Q  
amplifier. The combination of a series-connected capacitor and  
resistor sets the combination of a pole and zero frequency point  
that decide the characteristics of the control system. The DC gain  
of the voltage feedback loop is calculated by the following equa-  
tion:  
The goal of phase compensation design is to shape the con-  
verter transfer function to get the required loop gain. The system  
crossover frequency, where the feedback loop has unity gain, is  
important. Lower crossover frequencies result in slower line and  
load transient responses. On the other hand, higher crossover fre-  
quencies cause system instability. A good standard is to adjust the  
crossover frequency to approximately one-tenth of the switching  
frequency.  
V
FB  
Adc = Rl ×Gcs×AEA  
×
(1)  
,
Vout  
where  
VFB is the feedback voltage (0.5 V),  
AEA is the error amplifier voltage gain,  
The optimal selection of phase compensation components can be  
determined using the following procedure:  
GCS is the current sense transconductance, and  
Rl is the load resistor value.  
1. Choose the phase compensation resistor (R3) to adjust the  
required crossover frequency. R3 value is calculated by the fol-  
lowing equation:  
The system has two important poles. One is set by the phase  
compensation capacitor (C3) and the output resistor of the error  
amplifier. The other is set by the output capacitor and load resis-  
tor. These poles are calculated by the following equations:  
2π ×C2× fc Vout 2π ×C2×0.1× fs Vout  
R3 =  
×
<
×
(7)  
,
GEA×GCS VFB  
GEA×GCS  
VFB  
where fc is the required crossover frequency. This is usually  
adjusted to less than one-tenth of the switching frequency.  
G
EA  
fp1 =  
(2)  
(3)  
,
2π ×C3× AEA  
2. Choose the phase compensation capacitor (C3) to get the  
1
fp2 =  
required phase margin. For applications that have typical inductor  
values, adjusting the compensation zero point to less than one-  
quarter of crossover frequency provides sufficient phase margin.  
The value of C3 is calculated by the following equation:  
,
2π ×C2× Rl  
where GEA is the error amplifier transconductance.  
The system has one important zero point. This is set by the phase  
compensation capacitor (C3) and phase compensation resistor  
(R3). The zero point is shown by the following equation:  
4
C3 >  
(8)  
,
2π × R3× fc  
1
fz1 =  
(4)  
.
where R3 is the phase compensation resistor.  
2π ×C3× R3  
3. It is necessary to determine whether a second compensation  
capacitor (C6) is required. It is required if the ESR zero point of  
the output capacitor is less than half of the switching frequency,  
expressed as follows:  
If the value of the output capacitor is the large or if it has a high  
ESR, the system may have another important zero point. This  
zero point would be set by the ESR and capacitance of the output  
capacitor. The zero point is shown by the following equation:  
1
fESR =  
1
fs  
(5)  
.
<
2π ×C2× RESR  
(9)  
.
2π ×C2× RESR  
2
In this case a third pole, which is set by the phase compensation  
capacitor (C6) and phase compensation resistor (R3), is used to  
compensate the effect of the ESR zero point on the loop gain.  
The pole is shown by the following equation:  
If this is the case, add the second compensation capacitor (C6)  
and adjust ESR zero frequency (fp3). C6 value is calculated by  
the following equation:  
1
C2× RESR  
fp3 =  
C6 =  
(6)  
(10)  
.
.
2π ×C6× R3  
R3  
Allegro MicroSystems, Inc.  
7
115 Northeast Cutoff, Box 15036  
Worcester, Massachusetts 01615-0036 (508) 853-5000  
www.allegromicro.com  
Step-Down Switching Regulator with Current-Mode Control  
SI-8005Q  
Package Outline Drawing  
5.20  
8
0.15  
Branding area  
Tracking number  
in dimple  
0.40  
1
2
1.50  
0.08 ±0.08  
0.695 TYP  
0.05 ±0.05  
0.40  
1.27  
2.90  
Dimensions in millimeters  
Branding codes (exact appearance at manufacturer discretion):  
1st line, type: 8005Q  
2nd line, lot:  
SK YMDD  
Where: Y is the last digit of the year of manufacture  
M is the month (1 to 9, O, N, D)  
DD is the date  
3rd line, control : NNNN  
Leadframe plating Pb-free. Device composition  
complies with the RoHS directive.  
Allegro MicroSystems, Inc.  
8
115 Northeast Cutoff, Box 15036  
Worcester, Massachusetts 01615-0036 (508) 853-5000  
www.allegromicro.com  
Step-Down Switching Regulator with Current-Mode Control  
SI-8005Q  
Packing Specification  
Empty tape  
Trailer  
IC occupied tape  
Empty Tape  
Leader  
Cover Tape  
Units mm  
More than 160mm  
More than 400mm  
1,000pcs  
160mm  
(1,000 pockets)  
Direction of reel  
4
2
8
1.55  
5.5  
12  
5.6  
(4.75)  
7
2
Void  
60  
Void  
60  
B
Void  
Void  
Void  
Void  
3
10  
R22  
13 0.3  
15.4 0.1  
Void  
Void  
Center extension  
2
5
10.5  
4
13  
5
R22  
10  
30  
3
60  
60  
Allegro MicroSystems, Inc.  
115 Northeast Cutoff, Box 15036  
9
Worcester, Massachusetts 01615-0036 (508) 853-5000  
www.allegromicro.com  
Step-Down Switching Regulator with Current-Mode Control  
SI-8005Q  
Cautions  
In general, the junction temperature level of surface mount pack-  
age ICs is dependent upon the area and material of the PC board  
and its copper area. Therefore, please design the PCB to allow  
sufficient margin for heat dissipation.  
Thermal Shutdown The SI-8000Q series has a thermal protec-  
tion circuit. This circuit keeps the IC from the damage by over-  
load. But this circuit cannot guarantee the long-term reliability  
against the continuous overload conditions.  
Parallel Operation Parallel operation of multiple products to  
ESD Susceptibility Take precautions against damage by static  
increase the current is not allowed.  
electricity.  
The products described herein are manufactured in Japan by Sanken Electric Co., Ltd. for sale by Allegro MicroSystems, Inc.  
Sanken and Allegro reserve the right to make, from time to time, such departures from the detail specifications as may be required to permit im-  
provements in the performance, reliability, or manufacturability of its products. Therefore, the user is cautioned to verify that the information in this  
publication is current before placing any order.  
When using the products described herein, the applicability and suitability of such products for the intended purpose shall be reviewed at the users  
responsibility.  
Although Sanken undertakes to enhance the quality and reliability of its products, the occurrence of failure and 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 society due to device failure or malfunction.  
Sanken products listed in this publication are designed and intended for use as components in general-purpose electronic equipment or apparatus  
(home appliances, office equipment, telecommunication equipment, measuring equipment, etc.). Their use in any application requiring radiation  
hardness assurance (e.g., aerospace equipment) is not supported.  
When considering the use of Sanken products in applications where higher reliability is required (transportation equipment and its control systems  
or equipment, fire- or burglar-alarm systems, various safety devices, etc.), contact a company sales representative to discuss and obtain written  
confirmation of your specifications.  
The use of Sanken products without the written consent of Sanken in applications where extremely high reliability is required (aerospace equip-  
ment, nuclear power-control stations, life-support systems, etc.) is strictly prohibited.  
The information included herein is believed to be accurate and reliable. Application and operation examples described in this publication are  
given for reference only and Sanken and Allegro assume no responsibility for any infringement of industrial property rights, intellectual property  
rights, or any other rights of Sanken or Allegro or any third party that may result from its use.  
Copyright © 2007 Allegro MicroSystems, Inc.  
Allegro MicroSystems, Inc.  
115 Northeast Cutoff, Box 15036  
10  
Worcester, Massachusetts 01615-0036 (508) 853-5000  
www.allegromicro.com  
Step-Down Switching Regulator with Current-Mode Control  
SI-8005Q  
January, 2008  
<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  
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  
India  
Saket Devices Pvt. Ltd.  
Office No.13, First Floor, Bandal - Dhankude Plaza, Near PMT Depot, Paud Road, Kothrud, Pune - 411 038, India  
Tel: 91-20-5621-2340  
91-20-2528-5449  
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  
Sanken Electric Co., Ltd.  
I02-010EA-080130  
Step-Down Switching Regulator with Current-Mode Control  
SI-8005Q  
January, 2008  
Europe  
United Kingdom  
Sanken Power Systems (UK) Limited  
Pencoed Technology Park Pencoed, Bridgend CF35 5HY. UK  
Tel: 44-1656-869-100  
Fax: 44-1656-869-162  
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.  
I02-010EA-080130  

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