Page 1
TK11850L
I
S
EXT
V
IN
V
OUT
GND
7
C
X
8
EN
V
FB
+
-
+
-
BAND GAP REFERENCE
OSC
C
X
CLK
0.86 V
0.3 V
CLK
S
R
Q
V
REF
0.525 V
ERROR
COMP
IS COMP
0.1 V
WHITE LED DRIVER
FEATURES
n Very High Speed Adjustable OSC (Max 800 kHz)
n Very Wide Operating Voltage Range (2.3 V to 10 V)
n Low Loss Detector (Low Reference Voltage:
V
= 0.5 V)
REF
n Operates with Toko D31FU Miniature Coil (Current
Limited by Input Current Sensor)
n Internal Switching Transistor
n Internal Diode
n Active High On / Off Control
n Available Intensity Control Using EN Pin with PWM
Signal
n Very Small SOT23L-8 Surface Mount Package
DESCRIPTION
The TK11850L is a pulse skipping step-up DC-DC converter
IC designed for White LED driver applications with the
following built in: a very high current switching transistor
(400 mA peak), an inductor current limit detector, low
voltage reference (Vref = 0.5 V), high speed oscillator, an
error comparator, a rectifier diode (for small power output)
and an ON/OFF control. The IC works with a very wide
operating supply range (2.3 V to 10 V) and the adjustable
output voltage can be set as high as 20 V. The device is in
the ON state when the EN pin is pulled to a high level. Using
the very small TK11850L and a few external components,
battery powered systems with LCD displays such as digital
cameras and cellular phones can be effectively backlit with
white LEDs. The white LEDs are connected in series and
driven at a constant current resulting in uniform brightness
and high efficiency. This IC has an oscillator, which allows
the designer to set the operating frequency by an external
capacitor with the output controlled by pulse skipping. The
reference voltage is a very low 0.5 V, achieving high
efficiency operation with the constant current output. A
small coil can be used because the inductor current limit
detector circuit limits the peak current (caused by an input
APPLICATIONS
n LED Backlighting and Frontlighting
n LED Flashlights
n Step-up DC-DC Converters
voltage increase or the inrush current as start-up) that flows
through the coil. The ON /OFF control is built-in and the
circuit current can be decreased when the EN pin is low
(standby mode). The white LEDs can be dimmed by
applying a PWM signal to the EN (ON/OFF control) pin. With
this method, the white LED brightness is still controlled by
constant current resulting in constant chromaticity.
The TK11850L is available in the SOT23L-8 surface mount
package.
TK11850
V
IN
I
S
EXT
V
OUT
BLOCK DIAGRAM
8EN
C
7
X
GND
V
FB
ORDERING INFORMATION
May 2001 TOKO, Inc. Page 1
TK11850L
Tape/Reel Code
TAPE/REEL CODE
TL: Tape Left
Page 2
TK11850L
ABSOLUTE MAXIMUM RATINGS
Supply Voltage........................................................ 20 V
Switching Voltage .................................................... 20 V
Operating Voltage Range ............................... 2.3 to 10 V
Power Dissipation (Note 1) ................................. 400 mW
Storage Temperature Range .....................-55 to +150 °C
TK11850 ELECTRICAL CHARACTERISTICS
Test Conditions: VIN = 3 V, V
LOBMYSRETEMARAPSNOITIDNOCTSETNIMPYTXAMSTINU
=VEN = VIN, V
IS
)NIP
C(NOITCESROTALLICSO
X
= Open, VFB = GND, CX = 100 pF, TA = 25 °C, unless otherwise specified.
EXT
Operating Temperature Range.....................-30 to +85 °C
Switching Peak Current....................................... 400 mA
Diode Current ........................................................ 10 mA
Maximum Frequency ...................................... ~ 800 kHz
I
GHC
I
SID
I/
I
SID
V
V
V
CSO
V
TIMIL
I
nIsI
C
X
C
X
GHC
C
)HGIH(XC
X
C
)WOL(XC
X
C
X
oitaRtnerruC
egatloV
I
S
tnerruCgnigrahCV
tnerruCgnigrahcsiDV
XC
XC
egrahcsiDdnaegrahC
+egatloVdlohserhTV
-egatloVdlohserhTV
XC
XC
V1.0=612203
V0.1=539456
2.2
Ita
0= mA018068019Vm
GHC
Ita
0= mA062003043Vm
SID
egatloVnoitallicsO)-htV(-)+htV(025065006Vm
)NIP
I(NOITCESROTARAPMOCGNITIMILTNERRUC
S
esneStimiLtnerruC
V
tnerruCsaiBniPV
V=
TIMIL
V=
NI
V-
NI
SI
V3=50151
SI
277728Vm
mA
mA
mA
)NIPTXE(NOITCESHCTIWSTUPTUO
V
taS,WS
I
ffO,WS
rotsisnarTtuptuO
egatloVnoitarutaS
ffOrotsisnarTtuptuO
tnerruCegakaeL
V
XC
V
BF
I,V0=
WS
V,V1=
TXE
Am002=2.04.0V
V02=10.02
mA
V(NOITCESROTARAPMOCKCABDEEF
V
FER
I
nIBF
Note 1: Power dissipation is 400 mW when mounted. Derate at 3.2 mW / °C for operation above 25 °C.
V
BF
egatloVecnerefeR505.0525.0545.0V
tnerruCtuptuOniPV
)NIP
BF
BF
V4.0=2-3.0-
Page 2 May 2001 TOKO, Inc.
mA
Page 3
TK11850 ELECTRICAL CHARACTERISTICS (CONT)
Test Conditions: VIN = 3 V, VIS =VEN = VIN, V
LOBMYSRETEMARAPSNOITIDNOCTSETNIMPYTXAMSTINU
)NIPNE(NOITCESNWODTUHS
= Open, VFB = GND, CX = 100 pF, TA = 25 °C, unless otherwise specified.
EXT
TK11850L
V
V
I
V
V
V
V
I
I
)HGIH(NE
)WOL(NE
nINE
F
NI
)WOL(NI
)HGIH(NI
)ffO(CC
)nO(CC
V(NOITCES
NI
egatloVdrawroFI
)NIP
+egatloVdlohserhTNEedoMnO2V
-egatloVdlohserhTNEedoMnwodtuhS6.0V
tnerruCsaiBniPNEV
V-NIPTXE(NOITCESEDOID
)NIP
TUO
V=
NI
D
V3=258
NE
Am01=57.0V
mA
potSegatloVwoL7.10.23.2V
potStuptuOegatloVhgiH115.2141V
tnerruCylppuSnwodtuhSV
tnerruCylppuStnecseiuQV
v0=10.01
NE
V1=15.12Am
BF
mA
eulaVecnerefeR
I
η
ycneiciffE
DAOL
V
NI
V,Am02=
TUO
)2etoN(V6.3=
,V5.61=
87%
Note 2: This value is different depending on the components used, circuit conditions, etc. Thus, this is reference data only. Refer to Reference
data test circuit.
May 2001 TOKO, Inc. Page 3
Page 4
TK11850L
TEST CIRCUIT
I
CC
V
IN
V
V
IN
I
IS
I
EXT
I
VOUT
IN
V
V
IS
V
V
EXT
V
V
OUT
V
V V
10 µF
I
S
EXT
V
OUT
EN
C
GND
V
FB
X
8
7
100 pF
V
EN
V
V
CX
V
V
FB
I
EN
I
DIS
I
CHG
I
FB
REFERENCE DATA TEST CIRCUIT
I
C
47µ
LOAD
20 mA
OUT
I
CC
3.6 V
R
SC
0.22Ω
V
IN
V
C
47µ
IN
V
8
EN
IN
C
X
56 pF
I
TK11850L
C
L
15µ
V
S
OUT
7
GND
X
EXT
V
FB
D
620k
20k
V
2200p
L = 15 mH D52LC (A914BYW - 150M) Toko
D - SB07 - 03C Sanyo
OUT
Page 4 May 2001 TOKO, Inc.
Page 5
TYPICAL PERFORMANCE CHARACTERISTICS
SUPPLY CURRENT (mA)
10
SUPPLY CURRENT vs.
EN VOLTAGE
EN VOLTAGE (V)
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
9
8
7
6
5
4
3
2
1
0
-20 °C
25 °C
85 °C
VIN = 3 V
VIS = V
IN
VFB = 0 V
CX = 100 pF
TA = 25 °C, unless otherwise specified.
TK11850L
OSC PERIOD vs. C
CAPACITANCE
12
11
10
9
VIN = 3 V
VIS = VEN = V
IN
8
7
6
5
4
OSC PERIOD (µS)
3
2
1
0
0 100 200 300
CX CAPACITANCE (pF)
SWITCHING CURRENT vs.
SWITCH SATURATION VOLTAGE
500
400
300
200
100
VIN = 3 V
VIS = VEN = V
VFB = 0 V
VCX = 0 V
IN
SWITCHING CURRENT (mA)
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
SWITCH SATURATION
VOLTAGE (V)
X
-20 °C
25 °C
85 °C
OSC FREQUENCY vs.
TEMPERATURE
300
280
VIN = 3 V
V
VIN = 10 V
260
240
220
VIS = VEN =V
CX = 100 pF
200
OSC FREQUENCY (kHz)
180
-30 -10 10 30 50 70 90
IN
TEMPERATURE (°C)
INDUCTOR CURRENT-LIMIT SENSE
VOLTAGE vs. SUPPLY VOLTAGE
100
90
80
70
60
50
40
30
20
SENSE VOLTAGE (mV)
INDUCTOR CURRENT-LIMIT
10
0
2 4 6 8 10 12
SUPPLY VOLTAGE (V)
IN = 5 V
V
limit
VEN = V
-20 °C
25 °C
85 °C
= VIS - V
IN
MAXIMUM DUTY CYCLE vs.
OSC FREQUENCY
80
VIN = 3 V
VIS = V
EN = VIN
VFB = 0 V
75
70
MAXIMUM DUTY CYCLE (%)
65
10 100 1000
OSC FREQUENCY (kHz)
IS INPUT BIAS CURRENT
vs. IS VOLTAGE
100
90
80
-20 °C
25 °C
85 °C
70
IN
60
50
40
30
20
INPUT BIAS CURRENT (µA)
10
S
I
0
0 2 4 6 8 10 12 14 16 18 20
VIN = VEN = V
VFB = 1 V
IS
IS VOLTAGE (V)
REFERENCE VOLTAGE vs.
SUPPLY VOLTAGE
530
528
526
524
522
520
518
REFERENCE VOLTAGE (mV)
516
0 2 4 6 8 10
SUPPLY VOLTAGE (V)
May 2001 TOKO, Inc. Page 5
VIS = VEN = V
REFERENCE VOLTAGE vs.
TEMPERATURE
530
528
VIN = 3 V
VIS = VEN = V
IN
526
IN
524
522
520
518
REFERENCE VOLTAGE (mV)
516
-30 -10 10 30 50 70 90
TEMPERATURE (°C)
Page 6
TK11850L
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 °C, unless otherwise specified.
SUPPLY CURRENT vs.
EN INPUT BIAS CURRENT
10
9
8
7
6
5
4
3
2
SUPPLY CURRENT (mA)
1
0
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
VIN = 3 V
VIS = V
IN
VFB = 0 V
CX = 100 pF
EN INPUT BIAS CURRENT (µA)
DIODE CURRENT vs.
DIODE FORWARD VOLTAGE
10
8
VIS = VEN = V
IN
6
4
2
DIODE CURRENT (mA)
0
300 400 500 600 700 800
DIODE FORWARD VOLTAGE (mV)
-20 °C
25 °C
85 °C
EN INPUT BIAS CURRENT
vs. EN VOLTAGE
100
90
80
-20 °C
25 °C
85 °C
70
60
50
40
30
20
10
EN INPUT BIAS CURRENT (µA)
0
0 2 4 6 8 10 12 14 16 18 20
VIN = 3 V
VIS = V
IN
EN VOLTAGE (V)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
SUPPLY CURRENT (mA)
0.2
VIS = VEN = V
VFB = 1 V
CX = 100 pF
0
0 1 2 3 4 5 6 7 8 9 10
IN
SUPPLY VOLTAGE (V)
-20 °C
25 °C
85 °C
SUPPLY CURRENT vs.
SUPPLY VOLTAGE
10
9
8
(SHUTDOWN MODE)
-20 °C
25 °C
85 °C
VIS = V
IN
VEN = 0.6 V
7
6
5
4
3
2
SUPPLY CURRENT (µA)
1
0
0 2 4 6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
Page 6 May 2001 TOKO, Inc.
Page 7
APPLICATION CIRCUIT (2 LEDs in Series)
• Input Voltage: 2.7 V
• LED Current : 20 mA
• On/Off: Pin Number 8 (EN
LED Current (I
I
doesn’t depend on VIN because I
LED
is controlled by the feedback circuit.
) is set by R
LED
Pin)
LED
TYPICAL PERFORMANCE CHARACTERISTICS
LED Current and Efficiency Characteristics
VNI)V(INI)Am(V
)V(I
DEL
0.1 V
IS COMP
R
0.39 Ω
L 33 uH
D31FU
TOKO
V
IN
+
SC
V
-
I
S
EXT
OUT
V
IN
C
IN
4.7 µF
GND
SB07-03C
SANYO
.
LED
C
2.2 uF
OUT
TA = 25 °C, unless otherwise specified.
)Am()%(DELFE
DEL
TK11850L
BAND GAP REFERENCE
OSC
0.86 V
C
X
0.3 V
CLK
S
Q
R
V
LED
CLK
ERROR
COMP
V
REF
0.525 V
I
LED
L: D31FU, 33 mH
Toko Part Number: 888FU-330M
EN
8
C
7
GND
V
+
-
ON/OFF
X
C
X
100 pF
R
LED
FB
27 Ω
7.23.1710.718.816.86
0.39.2610.758.810.07
5.38.2520.759.819.17
5.49.9320.701.918.47
EF LED vs. VIN
100
80
60
40
EF LED (%)
20
0
0 2 4 6
V
(V)
IN
EF LED (%) = 100 * V
I
vs. VIN
LED
20
18
16
(mA)
14
LED
I
12
10
0 2 4 6
VIN (V)
LED
* I
LED
/ V
IN
* I
IN
May 2001 TOKO, Inc. Page 7
Page 8
TK11850L
• Input Voltage: 2.7 V
• LED Current: 20 mA
• On/Off: Pin Number 8 (EN Pin)
LED Current (I
I
doesn’t depend on VIN because I
LED
is controlled by the feedback circuit.
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
LED Current and Efficiency Characteristics
APPLICATION CIRCUIT (3 LEDs in Series)
0.1 V
IS COMP
R
SC
0.27 Ω
L 22 uH
D31FU
TOKO
C
2.2 uF
V
IN
+
-
I
S
EXT
V
OUT
OUT
Q
V
) is set by R
LED
V
IN
C
IN
4.7 µF
GND
SB07-03C
SANYO
.
LED
LED
TA = 25 °C, unless otherwise specified.
0.86 V
Cx
CLK
S
R
LED
BAND GAP REFERENCE
OSC
0.3 V
I
LED
EN
ON/OFF
8
C
X
7
CLK
ERROR
COMP
+
-
V
REF
0.525 V
C
X
82 pF
GND
R
LED
27 Ω
V
FB
VNI)V(INI)Am(V
)V(I
DEL
DEL
)Am()%(DELFE
5.29.51183.0114.9125.96
7.29.60183.0194.9190.07
0.34.5983.0125.9138.07
5.31.9783.0125.9191.37
5.42.9593.0165.9162.67
0.69.2493.0106.9140.97
EF LED vs. VIN
100
80
60
40
EF LED (%)
L: D31FU, 22 mH
Toko Part Number: 888FU-220M
EF LED (%) = 100 * V
I
LED
20
18
16
(mA)
14
LED
I
vs. VIN
LED
* I
LED
/ VIN* I
IN
20
0
0 2 4 6 8
V
(V)
IN
12
10
0 2 4 6 8
VIN (V)
Page 8 May 2001 TOKO, Inc.
Page 9
APPLICATION CIRCUIT (4 LEDs in Series)
• Input Voltage: 2.7 V
• LED Current: 20 mA
• On/Off: Pin Number 8 (EN Pin)
LED Current (I
I
doesn’t depend on VIN because I
LED
is controlled by the feedback circuit.
) is set by R
LED
LED
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 °C, unless otherwise specified.
LED Current and Efficiency Characteristics
TK11850L
0.1 V
IS COMP
R
0.22 Ω
L 15 uH
D52LC
TOKO
SC
C
2.2 uF
V
IN
+
-
I
S
EXT
V
OUT
OUT
Q
0.86 V
C
X
CLK
S
R
BAND GAP REFERENCE
OSC
0.3 V
V
LED
CLK
ERROR
COMP
V
REF
0.525 V
I
LED
V
IN
C
IN
4.7 µF
GND
SB07-03C
SANYO
.
LED
EN
ON/OFF
8
C
X
7
C
X
56 pF
GND
R
LED
27 Ω
V
FB
+
-
VNI)V(INI)Am(V
)V(I
DEL
DEL
)Am()%(DELFE
5.24.44186.3123.9103.37
7.22.23186.3103.9179.37
0.39.71186.3172.9144.47
5.30.9986.3182.9170.67
5.43.5786.3153.9160.87
0.63.5586.3143.9117.97
EF LED vs. VIN
100
80
60
40
EF LED (%)
L: D52LC, 15 mH
Toko Part Number: A914BYNW - 150M
EF LED (%) = 100 * V
20
18
16
(mA)
14
LED
I
I
LED
vs. VIN
LED
* I
LED
/ VIN * I
IN
20
0
0 2 4 6 8
V
(V)
IN
12
10
0 2 4 6 8
VIN (V)
May 2001 TOKO, Inc. Page 9
Page 10
TK11850L
The following are 3 kinds of dimming methods.
DIMMING
1. Dimming by R
The current of the LED (I
LED
) is determined by R
LED
LED
Example of 3 LEDs with a 4 brightness level circuit:
0.1 V
IS COMP
+
-
BAND GAP REFERENCE
OSC
0.86 V
Cx
0.3 V
CLK
CLK
S
Q
R
V
LED
CLK
I
LED
GND
V
IN
C
IN
V
IN
R
SC
I
S
L
EXT
D
V
OUT
C
OUT
,which can be set by switches such as transistors.
EN
ON/OFF
8
V
C
X
7
C
X
GND
I
R
V
LED
REF
=
R
LED
: Total value of Resistors
LED
= 0.525 V (typ)
REF
VFB Voltage = 0.525 V (typ)
ERROR
COMP
V
REF
0.525 V
V
FB
+
-
R
LED2
CONTROL
SIGNAL 1
R
LED3
CONTROL
SIGNAL 2
SW2
R
LED1
SW1
I
vs. R
LED
R
(9)I
DEL
429.12
725.91
636.41
154.01
LED
LED CURRENT (I
)Am(
DEL
20
TOTAL RESISTANCE (R
LED
) vs.
LED
)
18
16
14
12
10
(mA)
8
LED
I
6
4
0014.5
0151.1
2
0
10 100 1000
R
LED
(Ω)
Page 10 May 2001 TOKO, Inc.
Page 11
TK11850L
2. PWM Dimming
DIMMING (CONT)
Apply the PWM signal to the EN Terminal (Pin no. 8). In this case, a signal frequency of approximately120 Hz is adequate.
The average current of the LED changes due to the On/Off cycle of the IC, which follows the duty cycle of the PWM signal.
Set the PWM signal at a high level over 2 V and a low level under 0.6 V, with a driving current over 2 mA.
0.1 V
V
GND
V
IN
C
IN
IN
R
SC
I
S
L
EXT
D
V
OUT
C
OUT
IS COMP
+
-
CLK
BAND GAP REFERENCE
OSC
0.86 V
Cx
0.3 V
CLK
S
Q
R
V
LED
CLK
ERROR
COMP
+
-
V
REF
0.525 V
I
LED
(LED CURRENT)
The PWM dimming LED current follows the PWM signal. (As shown above)
The average LED current is obtained from the formula below. The graph below shows an example with I
a Duty Cycle up to 100%.
I
vs. DUTY
LED
I
LED(AVG)
= I
LED(MAX)
EN
ON/OFF
8
C
X
7
C
X
GND
V
FB
(Applied to On/Off pin.)
R
LED
Duty
*
LED CURRENT CURVE vs. PWM SIGNAL CURVE
LED CURRENT
Toff
Ton
PWM SIGNAL
T
LED(MAX)
LED SETTING
CURRENT
2.0 V
0.6 V
fdim = 1 / T = 120 Hz
Duty (%) = (Ton * 100) / T
(20 mA) at
100
)%(YTUDI
)Am(
DEL
0010.02
090.81
080.61
070.41
LED CURRENT (I
DUTY CYCLE OF INPUT PWM SIGNAL
20
18
LED
) vs.
16
060.21
050.01
040.8
14
12
10
(mA)
8
LED
I
6
030.6
4
2
020.4
010.2
0
0 20 40 60 80 100
DUTY CYCLE (%)
May 2001 TOKO, Inc. Page 11
Page 12
TK11850L
Input PWM signal curve vs. LED current curve (ex. Three LEDs, Output current 20 mA)
(1) Duty Cycle = 80%
(2) Duty Cycle = 50%
LED CURRENT
10 mA/Div
2.0 mSec/Div
PWM SIGNAL
(Applied to On/Off pin.)
1.0 V/Div
2.0 mSec/Div
LED CURRENT
10 mA/Div
2.0 mSec/Div
(3) Duty Cycle = 20%
PWM SIGNAL
(Applied to On/Off pin.)
1.0 V/Div
2.0 mSec/Div
LED CURRENT
10 mA/Div
2.0 mSec/Div
PWM SIGNAL
(Applied to On/Off pin.)
1.0 V/Div
2.0 mSec/Div
Page 12 May 2001 TOKO, Inc.
Page 13
3. Dimming by DAC (D/A Converter) output
TK11850L
DIMMING (CONT)
Dimming is achievable by applying a DAC output to the VFB terminal with the addition of R
V
GND
V
IN
C
IN
IN
R
SC
I
S
L
EXT
D
V
OUT
C
OUT
IS COMP
+
-
CLK
BAND GAP REFERENCE
OSC
0.86 V
Cx
0.3 V
CLK
S
Q
R
V
LED
CLK
ERROR
COMP
V
REF
0.525 V
I
LED
EN
8
C
X
7
GND
V
+
-
FB
R
1
LED
0.1 V
Example Conditions:
R
= R
R
DAC1
LED
DAC2
= 49 W
I
LED
vs. V
DAC
DAC1
ON/OFF
R
DAC1
R
DAC2
and R
C
X
DAC OUTPUT
DAC2
.
)V(EGATLOVCAD)Am(TNERRUCDEL
1.085.91
2.054.71
3.023.51
4.012.31
5.080.11
6.059.8
7.048.6
8.017.4
9.06.2
15.0
LED CURRENT (I
DAC VOLTAGE (V
20
LED
) vs.
DAC
)
18
16
14
12
10
(mA)
8
LED
I
6
4
2
0
0 0.2 0.4 0.6 0.8 1
V
DAC
(V)
May 2001 TOKO, Inc. Page 13
Page 14
TK11850L
PACKAGE OUTLINE
SOT23L-8
8
1
Marking Information
Marking
0.45
5
Marking
4
e
0.8
+0.3
- 0.1
3.5
(3.4)
+0.15
- 0.05
0.3
Çl
0.1
(0.3)
1.0
Recommended Mount Pad
2.2
3.0
1
e
e
0.8
TK11850L 1850
1.2
1.4max
15 max
0.1
Dimensions are shown in millimeters
Tolerance: x.x = ± 0.2 mm (unless otherwise specified)
+0.15
0 - 0.1
- 0.15
0.15
+ 0.3
3.3
0.4
Toko America, Inc. Headquarters
1250 Feehanville Drive, Mount Prospect, Illinois 60056
Tel: (847) 297-0070 Fax: (847) 699-7864
TOKO AMERICA REGIONAL OFFICES
Midwest Regional Office
Toko America, Inc.
1250 Feehanville Drive
Mount Prospect, IL 60056
Tel: (847) 297-0070
Fax: (847) 699-7864
Western Regional Office
Toko America, Inc.
2480 North First Street , Suite 260
San Jose, CA 95131
Tel: (408) 432-8281
Fax: (408) 943-9790
Semiconductor Technical Support
Toko Design Center
4755 Forge Road
Colorado Springs, CO 80907
Tel: (719) 528-2200
Fax: (719) 528-2375
Visit our Internet site at http://www.tokoam.com
The information furnished by TOKO, Inc. is believed to be accurate and reliable. However, TOKO reserves the right to make changes or improvements in the design, specification or manufacture of its products
without further notice. TOKO does not assume any liability arising from the application or use of any product or circuit described herein, nor for any infringements of patents or other rights of third parties which may
result from the use of its products. No license is granted by implication or otherwise under any patent or patent rights of TOKO, Inc.
Page 14 May 2001 TOKO, Inc.
All Rights Reserved
IC-XXX-TKXXXXX
0798O0.0K
Printed in the USA© 1999 Toko, Inc.
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