SP6691_07 [SIPEX]
SOT23Micro Power Boost Regulator Series White LED Driver; SOT23Micro功率升压型稳压器系列白光LED驱动器
| 型号： | SP6691_07 |
| 厂家： | 
SIPEX CORPORATION |
| 描述： | SOT23Micro Power Boost Regulator Series White LED Driver |
| 文件： | 总15页 (文件大小：703K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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SP6691
TM
Micro Power Boost Regulator Series White LED Driver
FEATURES
NC
FB
NC
8
7
6
5
1
2
3
4
■ Drives up to 6 LEDs @ 25mA
■ Drives up to 8 LEDs @ 20mA
■ High Output Voltage: Up to 30V
SP6691
8 Pin DFN
SHDN
VIN
NC
SW
■ Optimized for Single Supply,
GND
2.7V - 4.2V Applications
■ Operates Down to 1V
■ High Efficiency: Greater Than 75%
■ Low Quiescent Current: 20µA
■ Ultra Low Shutdown Current: 10nA
■ Single Battery Cell Operation
■ Programmable Output Voltage
■ 11 switch (350mV at 350mA)
APPLICATIONS
■ White LED Driver
■ High Voltage Bias
■ Digital Cameras
■ Cell Phone
■ Battery Backup
■ Handheld Computers
■ Lead Free, RoHS Compliant Packages:
8 Pin DFN, 5 Pin TSOT or 5 Pin SOT23
DESCRIPTION
The SP6691 is a micro power boost regulator that is specifically designed for powering series
configuration white LED. The part utilizes fixed off time architecture and consumes only 10nA
quiescent current in shutdown. Low voltage operation, down to 1V, fully utilizes maximal battery
life. The SP6691 is offered in a 8 Pin DFN, 5-pin SOT-23 or 5 Pin TSOT package and enables
the construction of a complete regulator occupying < 0.2 in2 board space.
TYPICAL APPLICATION CIRCUIT
10µH
L1
2.7 to 4.2V
D1
SW
VIN
®
2.2 µF
C2
SP6691
SHDN
FB
GND
4.7µF
Rb
C1
Jun26-07 Rev D
Micro Power Boost Regulator Series White LED Driver
© 2007 Sipex Corporation
ꢀ
ABSOLUTE MAXIMUM RATINGS
VIN ....................................................................... 15V
SW Voltage .............................................. -0.4 to 30V
FB Voltage......................................................... 2.5V
All other pins ................................... -0.3 to VIN + 0.3V
Current into FB ................................................. ±1mA
TJ Max ............................................................. 125°C
Operating Temperature Range ............ -40°C to 85°C
Peak Output Current < 10us SW .................... 500mA
Storage Temperature ...................... -65°C to +150°C
Power Dissipation. ......................................... 200mW
ESD Rating................................................. 2kV HBM
These are stress ratings only and functional operation of the device at
these ratings or any other above those indicated in the operation sections
of the specifications below is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may affect reliability.
ELECTRICAL CHARACTERISTICS
SpecificationsareatTA=25°C,VIN =3.3,VSHDN =V , denotesthespecificationswhichapplyoverthefulloperating
temperature range, unless otherwise specified.
z
IN
z
PARAMETER
SYMBOL
MIN
TYP
MAX UNITS
CONDITIONS
Input Voltage
VIN
IQ
1.0
13.5
30
V
µA
µA
V
z
z
z
Supply Current
20
0.01
1.22
8
No Switching
1
SHDN = 0V (off)
Reference Voltage
VFB
HYST
IFB
1.17
1.27
FB Hysteresis
mV
nA
%/V
nS
mV
mA
µA
V
z
VFB Input Bias Current
Line Regulation
15
80
VFB = 1.22V
6Vo/6VI
TOFF
VCESAT
ILIM
0.1
250
170
450
5
0.3
1.2 ) VIN ) 13.5V
Switch Off Time
z
z
z
Switch Saturation Voltage
Switch Current Limit
SHDN Bias Current
SHDN High Threshold (on)
SHDN Low Threshold (off)
Switch Leakage Current
450
575
12
ISW = 325mA
VSHDN = 3.3V
325
0.9
ISHDN
VIH
VIL
0.25
5
V
z
ISWLK
0.01
µA
Switch Off, VSW = 5V
PIN DESCRIPTION
PIN NUMBER
PIN NAME
NC
8 PIN DFN DESCRIPTION
No connect.
1
2
3
3
5
6
FB
NC
Feedback.
No connect.
SW
GND
VIN
Switch input to the internal power switch
Ground
Input Voltage. Bypass this pin with a capacitor as close to the device
as possible.
7
8
SHDN
NC
Shutdown. Pull high (on) to enable. Pull low (off) for shutdown.
No connect.
Jun26-07 Rev D
Micro Power Boost Regulator Series White LED Driver
© 2007 Sipex Corporation
2
PIN DESCRIPTION
PIN NUMBER
PIN NAME
SW
DESCRIPTION
1
2
3
4
5
Switch input to the internal power switch.
GND
FB
Ground
Feedback
SHDN
VIN
Shutdown. Pull high (on) to enable. Pull low (off) for shutdown.
Input Voltage. Bypass this pin with a capacitor as close to the device
as possible.
FUNCTIONAL DIAGRAM
SW
1
VIN
5
R1
Q1
R2
X1
DISABLE
+
-
POWER
TRANSISTOR
SET
250ns
Q2
FB
3
ONE-SHOT
DRIVER
CLEAR
X2
R3
R4
+
-
GND
Shutdown
Logic
2
SHDN
4
THEORY OF OPERATION
450mA, comparator X2 clears the latch, which
turns off the driver transistor for a preset 250nS.
At the instant of shutoff, inductor current is
diverted to the output through diode D1. During
this250nStimelimit,inductorcurrentdecreases
while its energy charges C2.
Operationcanbebestunderstoodbyreferringto
the functional diagram above and the typical
application circuit in the front page. Q1 and Q2
along with R3 and R4 form a band gap refer-
ence. The input to this circuit completes a feed-
back path from the high voltage output through
a voltage divider, and is used as the regulation
control input. When the voltage at the FB pin is
slightly above 1.22V, comparator X1 disables
most of the internal circuitry. Current is then
provided by capacitor C2, which slowly dis-
charges until the voltage at the FB pin drops
below the lower hysteresis point of X1, about
6mV. X1 then enables the internal circuitry,
turns on chip power, and the current in the
inductor begins to ramp up. When the current
through the driver transistor reaches about
At the end of the 250ns time period, driver
transistor is again allowed to turn on which
ramps the current back up to the 450mA level.
Comparator X2 clears the latch, it’s output turns
off the driver transistor, and this allows delivery
ofL1’sstoredkineticenergytoC2. Thisswitch-
ing action continues until the output capacitor
voltage is charged to the point where FB is at
band gap (1.22V). When this condition is
reached, X1 turns off the internal circuitry and
the cycle repeats.
Jun26-07 Rev D
Micro Power Boost Regulator Series White LED Driver
© 2007 Sipex Corporation
ꢁ
PERFORMANCE CHARACTERISTICS
Refer to the typical application circuit, TAMB = 25°C, unless otherwise specified.
V
o
ut=1
2
VEfficie
n
c
y
V
o
ut=1
2
VLoadRe
g
ulatio
n
9
0
Vin =
1
3.0
Vin =
5.0
V
5.0
V
Vin =
Vin =
80
4.2
V
12.5
4.2
V
Vin =
Vin =
70
12.0
60
11.5
50
11.0
0
20
40
60
8
0
1
0
0
1
2
0
1
4
0
1
6
0
0
20
40
60
8
0
1
0
0
1
2
0
1
4
0
1
6
0
Iout(mA)
Iout(mA)
Figure 1. 12V Output Efficiency
Figure 2. 12V Output Load Regulation
V
o
ut=1
5
VEfficienc
y
V
o
ut=1
5
VLoadRe
g
ulatio
n
90
80
70
60
50
16.0
15.5
15.0
14.5
14.0
Vin=
5.0V
Vin=
4.2V
Vin=
3.3V
Vin=5.0V
Vin=4.2V
Vin=3.3V
Vin=2.7V
Iout6(0mA)
Iout(mA)
0
20
40
80
100
120
0
20
40
60
80
100
120
Figure 3. 15V Output Efficiency
Figure 4. 15V Output Load Regulation
Vout=18VEfficiency
Vout=18VLoadRegulation
90
80
70
60
50
19.0
Vin =
5.0V
Vin =
4.2V
Vin =
Vin =
5.0V
Vin =
4.2V
Vin =
18.5
18.0
17.5
17.0
0
20
40
60
80
100
0
20
40
60
80
100
Iout(mA)
Iout(mA)
Figure 5. 18V Output Efficiency
Figure 6. 18V Output Load Regulation
Jun26-07 Rev D
Micro Power Boost Regulator Series White LED Driver
© 2007 Sipex Corporation
ꢂ
PERFORMANCE CHARACTERISTICS
Refer to the typical application circuit, TAMB = 25°C, unless otherwise specified.
V
o
ut=2
1
VEfficienc
y
V
o
ut=2
1
VLoadRe
g
ulatio
n
9
0
2
2.0
Vin =
Vin =
5.0
V
5.0
V
Vin =
Vin =
80
21.5
4.2
V
4.2
V
Vin =
Vin =
70
21.0
60
20.5
50
20.0
0
10
20
3
0
4
0
50
60
70
0
10
20
3
0
4
0
50
60
70
Iout(mA)
Iout(mA)
Figure 7. 21V Output Efficiency
Figure 8. 21V Output Load Regulation
V
o
ut=2
4
VEfficienc
y
V
o
ut=2
4
VLoadRe
g
ulatio
n
90
80
70
60
50
Vin =
5.0V
Vin =
4.2V
Vin =
25.0
24.5
24.0
23.5
23.0
Vin =
5.0V
Vin =
4.2V
Vin =
0
10
20
30
40
50
60
0
10
20
30
40
50
60
Iout(mA)
Iout(mA)
Figure 9. 24V Output Efficiency
Figure 10. 24V Output Load Regulation
Vout=30VEfficiency
Vout=30VLoadRegulation
90
80
70
60
50
40
31.0
Vin =
5.0V
Vin =
4.2V
Vin =
Vin =
5.0V
Vin =
4.2V
Vin =
30.5
30.0
29.5
29.0
0
5
10
15
20
25
30
0
5
10
15
20
25
30
Iout(mA)
Iout(mA)
Figure 11. 30V Output Efficiency
Figure 12. 30V Output Load Regulation
Jun26-07 Rev D
Micro Power Boost Regulator Series White LED Driver
© 2007 Sipex Corporation
ꢃ
PERFORMANCE CHARACTERISTICS
Refer to the typical application circuit, TAMB = 25°C, unless otherwise specified.
10
25
8
6
4
2
0
2
0
15
T
a
mb=-2
5
C
T
a
mb
=
2
5
C
10
T
a
mb
=
8
5
C
5
0
1.2
1.8
2.4
3
3.6
4.2
4.8
5.4
1.2
1.8
2.4
3
3.6
4.2
4.8
5.4
In
p
utVolta
g
e(V)
In
p
utVolta
g
e(V)
Figure 13. Quiescent Current IQ vs. VIN
Figure 14. Shutdown Pin Current vs. VIN
6
0
0
4
0
0
50
0
0
3
5
0
3
0
0
40
2
5
0
30
0
2
0
0
1
5
0
20
0
1
0
0
10
0
5
0
0
0
-3
0
-10
10
3
0
50
70
90
1.2
1.8
2.4
3
3.6
4.2
4.8
5.4
T
e
mperature(C)
In
p
utVolta
g
e(V)
Figure 15. IPK Current Limit vs. VIN
Figure 16. Switch Saturation Voltage VCESAT vs.
Temperature (ISW = 450mA)
1.25
20
1.24
16
1.23
12
1.22
8
1.2
1
4
0
1.2
0
-3
0
-10
10
3
0
50
70
90
0
20
4
0
6
0
80
1
0
0
T
e
mperature(C)
P
W
M
D
utyCycle(%)
Figure 18. Average IO vs. SHDN Duty Cycle (VIN=3.3V,
Standard 4x20mA WLED Evaluation Board, PWM
Frequency 100Hz
Figure 17. Feedback Voltage vs. Temperature
Jun26-07 Rev D
Micro Power Boost Regulator Series White LED Driver
© 2007 Sipex Corporation
6
PERFORMANCE CHARACTERISTICS
Refer to the typical application circuit, TAMB = 25°C, unless otherwise specified.
VSW
EN
VOUT
VOUT (AC)
IIN (0.5A/Div)
IL (0.5A/Div)
Figure 19. Startup Waveform (VIN=3.3V, VOUT=15V,
IOUT=20mA)
Figure 20. Typical Switching Waveforms (VIN=3V,
VOUT=15V, IOUT=20mA)
IOUT (100mA/Div)
VOUT (AC)
IL (0.5A/Div)
Figure 21. Load Step Transient (VIN=3V, VOUT=21V,
1¾15mA Load Step
Jun26-07 Rev D
Micro Power Boost Regulator Series White LED Driver
© 2007 Sipex Corporation
7
APPLICATION INFORMATION
Capacitor Selection
Inductor Selection
For SP6691, the internal switch will be turned
off only after the inductor current reaches the
typical dc current limit (ILIM=450mA). How-
ever, there is typically propagation delay of
200nS between the time when the current limit
isreachedandwhentheswitchisactuallyturned
off. During this 200nS delay, the peak inductor
currentwillincrease,exceedingthecurrentlimit
by a small amount. The peak inductor current
can be estimated by:
Ceramic capacitors are recommended for their
inherently low ESR, which will help produce
low peak to peak output ripple, and reduce high
frequency spikes.
For the typical application, 4.7µF input capaci-
tor and 2.2µF output capacitor are sufficient.
The input and output ripple could be further
reduced by increasing the value of the input and
output capacitors. Place all the capacitors as
close to the SP6691 as possible for layout. For
use as a voltage source, to reduce the output
ripple, a small feedforward (47pF) across the
top feedback resistor can be used to provide
sufficient overdrive for the error comparator,
thus reduce the output ripple.
VIN(MAX)
IPK = ILIM
+
• 200nS
L
The larger the input voltage and the lower the
inductor value, the greater the peak current.
In selecting an inductor, the saturation current
specified for the inductor needs to be greater
thantheSP6691peakcurrenttoavoidsaturating
the inductor, which would result in a loss in
efficiency and could damage the inductor.
Refer to Table 2 for some suggested low ESR
capacitors.
Table 2. Suggested Low ESR Capacitor
Choosing an inductor with low DCR decreases
power losses and increase efficiency.
MANUF.
PART NUMBER
CAP
SIZE
/VOLTAGE /TYPE
Refer to Table 1 for some suggested low ESR
inductors.
GRM32RR71E
225KC01B
2.2µF
/25V
1210
/X5R
MURATA
770-436-1300
GRM31CR61A
475KA01B
4.7µF
1206
/X5R
MURATA
770-436-1300
/10V
Table 1. Suggested Low ESR inductor
TDK
C3225X7R1E
225M
2.2µF
1210
/X7R
847-803-6100
/25V
MANUF.
PART NUMBER
DCR
(1)
Current
Rating
TDK
847-803-6100
C3216X5R1A
475K
4.7µF
/10V
1206
/X5R
(mA)
MURATA
LQH32CN100K11
0.3
450
770-436-1300
(10µH)
LED Current Program
TDK
NLC453232T-100K
0.55
500
847-803-6100
(10µH)
In the white LEDs application, the SP6691 is
generally programmed as a current source. The
bias resistor Rb, as shown in the typical applica-
tion circuit is used to set the operating current of
the white LED using the equation:
Diode Selection
A schottky diode with a low forward drop and
fast switching speed is ideally used here to
achieve high efficiency. In selecting a Schottky
diode, the current rating of the schottky diode
should be larger than the peak inductor current.
Moreover, the reverse breakdown voltage of the
schottky diode should be larger than the output
voltage.
VFB
Rb =
IF
where VFB is the feedback pin voltage (1.22V),
IF is the operating current of the White LEDs.
In order to achieve accurate LED current, 1%
Jun26-07 Rev D
Micro Power Boost Regulator Series White LED Driver
© 2007 Sipex Corporation
ꢄ
APPLICATION INFORMATION: Continued
precision resistors are recommended. Table 3
below shows the Rb selection for different white
LED currents. For example, to set the operating
current to be 20mA, Rb is selected as 60.4 1, as
shown in the schematic.
Table 4. Divider Resistor Selection
VOUT (V)
R1 (
1)
R2 (1)
12
15
18
21
30
1M
113K
88.7K
73.2K
61.9K
42.2K
1M
1M
1M
1M
Table 3. Bias Resistor Selection
IF (mA)
Rb (
1)
5
243
10
12
15
20
121
102
Brightness Control
Dimming control can be achieved by applying a
PWM control signal to the SHDN pin. The
brightness of the white LEDs is controlled by
increasing and decreasing the duty cycle of the
PWM signal. A 0% duty cycle corresponds to
zero LED current and a 100% duty cycle corre-
sponds to full load current. While the operating
frequency range of the PWM control is from
60Hz to 700Hz, the recommended maximum
brightness frequency range of the PWM signal
is from 60Hz to 200Hz. A repetition rate of at
least 60Hz is required to prevent flicker. The
magnitude of the PWM signal should be higher
than the minimum SHDN voltage high.
80.6
60.4
Output Voltage Program
The SP6691 can be programmed as either a
voltage source or a current source. To program
the SP6691 as voltage source, the SP6691 re-
quires 2 feedback resistors R1 & R2 to control
the output voltage. As shown in Figure 22.
VIN
D1
L1
V
O
U
T
Open Circuit Protection
C2
R1
R2
When any white LED inside the white LED
module fails or the LED module is disconnected
from the circuit, the output and the feedback
control will be open, thus resulting in a high
output voltage, which may cause the SW pin
voltage to exceed it maximum rating. In this
case, a zener diode can be used at the output to
limit the voltage on the SW pin and protect the
part. The zener voltage should be larger than the
maximum forward voltage of the White LED
module.
C1
U1
5
1
V
S
W
IN
S
P
6
6
9
1
4
3
S
H
D
N
F
B
1.2
2
V
G
N
D
2
Figure 22. Using SP6691 as Voltage Source
The formula and table for the resistor selection
are shown below:
V
R1 =
(
OUT - 1
• R2
)
1.22
Jun26-07 Rev D
Micro Power Boost Regulator Series White LED Driver
© 2007 Sipex Corporation
ꢅ
APPLICATION INFORMATION
Layout Consideration
MurataL
Q
H
3
2
C
N
1
0
0
K
1
1
VIN
D
S
L
1 1
0
u
H
0.4
5
A
2.7-4.2V
Boththeinputcapacitorandtheoutputcapacitor
should be placed as close as possible to the IC.
M
B
R
0
5
3
0
R
1
C
2
This can reduce the copper trace resistance
which directly effects the input and output
ripples. The feedback resistor network should
be kept close to the FB pin to minimize copper
trace connections that can inject noise into the
system. Thegroundconnectionforthefeedback
resistor network should connect directly to the
GNDpinortoananaloggroundplanethatistied
directly to the GND pin. The inductor and the
schottky diode should be placed as close as
possible to the switch pin to minimize the noise
coupling to the other circuits, especially the
feedback network.
1
5
0
K
o
h
m
2.2
u
F
C
1
4.7
u
F
U
1
5
1
WLED MODULE
S
W
V
I
N S
P
6
6
9
1
D1
4
3
1.2
S
H
D
N
F
B
0.7V
2
V
G
N
D
DI
OD
E
R
b
2
3
4.8
o
h
m
Figure 23. Improve Efficiency with Diode in Feedback
Loop
Tofurtherimprovetheefficiencyandreducethe
effects of the ambient temperature on the diode
D1 used in method 1, an op amp circuit can be
used as shown in Figure 24. The gain of the op
amp circuit can be calculated by:
Power Efficiency
For the typical application circuit, the output
efficiency of the circuit is expressed by
R1 + R2
Av =
R1
VOUT • IOUT
d =
VIN • IIN
If the voltage across the bias resistor is set to be
0.1V the current through R1 and R2 to be around
100µA, R1 and R2 can be selected as 1K and
11.2K respectively. LMV341 can be used be-
cause of its small supply current, offset voltage
and minimum supply voltage. By using this
method, the efficiency can be increased around
7%.
Where VIN , IIN, VOUT, IOUT are the input and
output voltage and current respectively.
While the white LED efficiency is expressed by
(VOUT - 1.22) • IOUT
d =
VIN • IIN
This equation indicates that the white LED
efficiency will be much smaller than the output
efficiency of the circuit when VOUT is not very
large,comparedtothefeedbackvoltage(1.22V).
MurataL
Q
H
3
2
C
N
1
0
0
K
1
1
V
b
at
t
er
y
D
S
L
1 1
0
u
H
0.4
5
A
2.7-4.2V
M
B
R
0
5
3
0
V
b
at
t
er
y
C
1
C
2
4.7
u
F
2.2
u
F
WLED MODULE
U
1
5
1
The other power is consumed by the bias resis-
tor. To reduce this power loss, two circuits can
be used, as shown in Figure 23 and Figure 24. In
Figure 23, a general-purpose diode (for ex-
ample, 1N4148) is used to bring the voltage
across the bias resistor to be around 0.7V. R1 is
usedtocreatealoopthatprovidesaround100µA
operating current for the diode. 3% efficiency
improvement can be achieved by using this
method.
V
S
W
6
IN S
P
6
6
9
1
0.1V
1
3
5
+
3
4
4
S
H
D
N
F
B
O
U
T
LM
V
3
4
1
1.2
2
V
-
G
N
D
2
R2
2
R
b
1
1.
2
K
R
1
1
K
5.
1
Ω
Figure 24. Improve Efficiency with Op Amp in Feedback
Loop
Jun26-07 Rev D
Micro Power Boost Regulator Series White LED Driver
© 2007 Sipex Corporation
ꢀ0
PACKAGE: PINOUTS
V
IN
V
SHDN
IN
SHDN
5
4
5
4
SP6691
5 Pin SOT-23
SP6691
5 Pin TSOT
1
2
3
1
2
3
SW
GND
FB
SW
GND
FB
NC
FB
NC
8
7
6
5
1
2
3
4
SP6691
8 Pin DFN
SHDN
VIN
NC
SW
GND
Jun26-07 Rev D
Micro Power Boost Regulator Series White LED Driver
© 2007 Sipex Corporation
ꢀꢀ
Package: 8 Pin DFn
Jun26-07 Rev D
Micro Power Boost Regulator Series White LED Driver
© 2007 Sipex Corporation
ꢀ2
Package: 5 Pin SOT-23
Jun26-07 Rev D
Micro Power Boost Regulator Series White LED Driver
© 2007 Sipex Corporation
ꢀꢁ
Package: 5 Pin TSOT
Jun26-07 Rev D
Micro Power Boost Regulator Series White LED Driver
© 2007 Sipex Corporation
ꢀꢂ
ORDERING INFORMATION
Temperature Range Package Type
Part Number
SP6691EK1 .......................................................... -40˚C to +85˚C ............................. 5 Pin TSOT
SP6691EK1/TR..................................................... -40˚C to +85˚C ............................ 5 Pin TSOT
SP6691EK ............................................................ -40˚C to +85˚C .......................... 5 Pin SOT-23
SP6691EK/TR....................................................... -40˚C to +85˚C ......................... 5 Pin SOT-23
SP6691ER ............................................................ -40˚C to +85˚C ............................... 8 Pin DFN
SP6691ER/TR ...................................................... -40˚C to +85˚C .............................. 8 Pin DFN
Available in lead free packaging. To order add "-L" suffix to part number.
Example: SP6691ER/TR = standard; SP6691ER-L/TR = lead free
/TR = Tape and Reel
Pack quantity is 2,500 for TSOT or SOT-23 and 3,000 for DFN.
For further assistance:
Email:
Sipexsupport@sipex.com
WWW Support page:
Sipex Application Notes:
http://www.sipex.com/content.aspx?p=support
http://www.sipex.com/applicationNotes.aspx
Solved by
Sꢀpꢁx corporꢂtꢀoꢃ
Hꢁꢂdquꢂrtꢁrs ꢂꢃd
Sales Office
TM
2ꢁꢁ South Hillview Drive
Milpitas, CA ꢅꢃ0ꢁꢃ
TEL: (ꢂ0ꢄ) ꢅꢁꢂ-7ꢃ00
FAX: (ꢂ0ꢄ) ꢅꢁꢃ-7600
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume
any liability arising out of the application or use of any product or circuit described herein; neither does it convey
any license under its patent rights nor the rights of others.
Jun26-07 Rev D
Micro Power Boost Regulator Series White LED Driver
© 2007 Sipex Corporation
ꢀꢃ
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