CAT4104 (ON Semiconductor)
700mA Quad Channel Constant Current LED Driver

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700 mA Quad Channel Constant Current LED Driver
CAT4104
FEATURES
„ 4 matched LED current sinks up to 175 mA
„ Up to 25 V operation on LED pins
„ Low dropout Current Source (0.4 V at 175 mA)
„ LED current set by external resistor
„ High frequency PWM dimming via EN/PWM
„ “Zero” current Shutdown mode
„ Thermal shutdown protection
„ RoHS-compliant TDFN 8-Pad 2 x 3 mm and
SOIC 8-Lead packages
APPLICATIONS
„ Automotive Lighting
„ General and Architectural Lighting
„ LCD backlight
ORDERING INFORMATION
Part
Number
Package
Quantity
per Reel
Package
Marking
CAT4104V-GT3 SOIC-8*
CAT4104VP2-GT3 TDFN-8*
3,000
3,000
CAT4104V
HC
* Lead Finish is NiPdAu
DESCRIPTION
The CAT4104 provides four matched low dropout current
sinks to drive high-brightness LED strings up to 175 mA
per channel. The LED channel current is set by an
external resistor connected to the RSET pin. The LED
pins are compatible with high voltage up to 25 V
supporting applications with long strings of LEDs.
The EN/PWM logic input supports the device enable and
high frequency external Pulse Width Modulation (PWM)
dimming control.
Thermal shutdown protection is incorporated in the device
to disable the LED outputs whenever the die temperature
exceeds 150ºC.
The device is available in the 8-pad TDFN 2 mm x 3 mm
package and the SOIC 8-Lead 150 mil wide package.
PIN CONFIGURATION
TDFN 8-Pad (Top View)
LED1 1
LED2 2
LED3 3
LED4 4
8 RSET
7 VIN
6 EN/PWM
5 GND
SOIC 8-Lead (Top View)
LED1
1
8 RSET
LED2
2
7 VIN
LED3
3
6 EN/PWM
LED4
4
5 GND
TYPICAL APPLICATION CIRCUIT
VCC
3 V to 25 V
LEDs
VIN
5V
OFF ON
R1
768
CAT4104
VIN LED1
LED2
EN/PWM
LED3
RSET
LED4
GND
175 mA
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
1
Doc. No. MD-5041 Rev. B


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700mA Quad Channel Constant Current LED Driver

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ABSOLUTE MAXIMUM RATINGS
Parameter
VIN, RSET, EN/PWM Voltages
LED1, LED2, LED3, LED4 Voltages
Storage Temperature Range
Junction Temperature Range
Lead Temperature
Rating
-0.3 to 6
-0.3 to 25
-65 to +160
-40 to +150
300
Unit
V
V
°C
°C
°C
RECOMMENDED OPERATING CONDITIONS
Parameter
VIN
Voltage applied to LED1 to LED4, outputs off
Voltage applied to LED1 to LED4, outputs on
Ambient Temperature Range
ILED per LED pin
Rating
3.0 to 5.5
up to 25
up to 6*
-40 to +85
10 to 175
Unit
V
V
V
°C
mA
* Keeping LEDx pin voltage below 6 V in operation is recommended to minimize thermal dissipation in the package.
Typical application circuit with external components is shown on page 1.
ELECTRICAL OPERATING CHARACTERISTICS
Min and Max values are over the recommended operating conditions unless specified otherwise.
Typical values are at VIN = 5.0 V, TAMB = 25°C
Symbol Name
Conditions
Min Typ
ILED-ACC LED Current Accuracy
ILEDNOM ILED
ILEDNOM
ILED-DEV LED Channel Matching
ILED ILEDAVG , note 1
ILED
VDOUT Dropout Voltage
ILED = 175 mA
VRSET RSET Pin Voltage
IQ Quiescent Current
No LED, RSET = Float
No LED, RSET = 770
IQSHDN Shutdown Current
VEN = 0V
REN/PWM
VHI
VLO
EN/PWM Pin
Internal pull-down resistance
Logic High Level
Logic Low Level
TSD Thermal Shutdown
THYS Thermal Hysteresis
ILED/IRSET RSET to LED Current gain ratio
25 mA LED current
VUVLO Undervoltage lockout (UVLO) threshold
Note 1: Min and Max values are tested for ILED = 50 mA, VIN = 3.5 V, VLEDx = 0.4 V, TAMB = 25°C.
-5
1.17
1.3
±2
±1
400
1.2
0.6
6
200
150
20
100
2.0
Max Units
%
+5 %
1.23
1
mV
V
mA
mA
µA
k
V
0.4 V
°C
°C
V
Doc. No. MD-5041 Rev. B
2 © 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice


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700mA Quad Channel Constant Current LED Driver

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CAT4104
RECOMMENDED EN/PWM TIMING
Min and Max values are over the recommended operating conditions unless specified otherwise.
Typical values are at VIN = 5.0 V, TAMB = 25°C
Symbol Name
Conditions Min Typ Max
TPS
Turn-On time, EN/PWM rising to ILED
from shutdown
ILED = 175 mA
ILED = 80 mA
TP1 Turn-On time, EN/PWM rising to ILED ILED = 175 mA
1.5
1.3
600
TP2
Turn-Off time, EN/PWM falling to ILED
ILED = 175 mA
ILED = 80 mA
400
300
TR LED rise time
ILED = 175 mA
ILED = 80 mA
700
440
TF LED fall time
TLO EN/PWM low time
ILED = 175 mA
ILED = 80 mA
1
360
320
THI EN/PWM high time
5
TPWRDWN EN/PWM low time to shutdown delay
48
Units
μs
ns
ns
ns
ns
μs
μs
ms
EN/PWM
SHUTDOWN
TP2
TPS
LED CURRENT
SHUTDOWN 0 mA
50%
THI
TLO
TPWRDWN
POWERDOWN
SHUTDOWN 0 mA
TP1 TR
TF
ILED =
1.2 V
RSET
x 100
90%
50%
10% 0 mA
QUIESCENT CURRENT
SHUTDOWN 0 mA
Figure 1. CAT4104 EN/PWM Timing
SHUTDOWN 0 mA
EN/PWM OPERATION
The EN/PWM pin has two primary functions. One
function enables and disables the device. The other
function turns the LED channels on and off for PWM
dimming control. The device has a very fast turn-on
time (from EN/PWM rising to LED on) and allows
“instant on” when dimming LED using a PWM signal.
Accurate linear dimming is compatible with PWM
frequencies from 100 Hz to 5 kHz for PWM duty cycle
down to 1%. PWM frequencies up to 50 kHz can be
supported for duty cycles greater than 10%.
When performing a combination of low frequencies
and small duty cycles, the device may enter shutdown
mode. This has no effect on the dimming accuracy,
because the turn-on time TPS is very short, in the
range of 1 µs.
To ensure that PWM pulses are recognized, pulse
width low time TLO should be longer than 1 µs. The
CAT4104 enters a “zero current” shutdown mode after
a 4 ms delay (typical) when EN/PWM is held low.
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
3
Doc. No. MD-5041 Rev. B


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700mA Quad Channel Constant Current LED Driver

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TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 5 V, VCC = 5 V, LED forward voltage = 3.5 V, CIN = 1 μF, TAMB = 25°C unless otherwise specified.
Quiescent Current vs. Input Voltage (RSET Open)
Quiescent Current vs. RSET Current
1.2 8.0
No Load
1.0
6.0
0.8 4.0
0.6 2.0
0.4
3.0
3.5 4.0 4.5 5.0
INPUT VOLTAGE [V]
5.5
Quiescent Current vs. Input Voltage (Full Load)
7.0
Full Load
6.5
6.0
5.5
5.0
3.0
3.5 4.0 4.5 5.0
INPUT VOLTAGE [V]
5.5
LED Line Regulation
200
160
120
80
40
0
3.0 3.5 4.0 4.5 5.0 5.5
VIN [V]
0.0
0.0
0.5 1.0 1.5
RSET CURRENT [mA]
2.0
LED Dropout vs. LED Pin Voltage
200
160
120
80
40
0
0.0
0.2 0.4 0.6 0.8
LED PIN VOLTAGE [V]
1.0
LED Current Change vs. Temperature
200
160
120
80
40
0
-40
0 40 80
TEMPERATURE [ºC]
120
Doc. No. MD-5041 Rev. B
4 © 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice


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700mA Quad Channel Constant Current LED Driver

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CAT4104
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 5 V, VCC = 5 V, LED forward voltage = 3.5 V, CIN = 1 μF, TAMB = 25°C unless otherwise specified.
LED Current vs. RSET Resistor
LED Current vs. LED Pin Voltage
1000
200
160
120
100
80
40
10
0.1
1.0
RSET [k]
10.0
0
01 234 56
LED PIN VOLTAGE [V]
RSET Pin Voltage vs. Input Voltage
1.30
RSET Pin Voltage vs. Temperature
1.30
1.25
1.25
1.20
1.20
1.15
1.15
1.10
3.0
3.5 4.0 4.5 5.0
INPUT VOLTAGE [V]
5.5
LED Off Current vs. LED pin Voltage
1.0
0.8
0.6
0.4
0.2
0.0
0
+125ºC
-40ºC
+25ºC
5 10 15 20 25 30
LED PIN VOLTAGE [V]
1.10
-40
0 40 80
TEMPERATURE [ºC]
120
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
5
Doc. No. MD-5041 Rev. B


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700mA Quad Channel Constant Current LED Driver

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TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 5 V, VCC = 5 V, LED forward voltage = 3.5 V, CIN = 1 μF, TAMB = 25°C unless otherwise specified.
EN/PWM Pull-down Current vs. VEN/PWM
25
EN/PWM Threshold vs. VIN
1.4
20 1.2
-40ºC
25ºC
15 1.0
10 0.8
5 0.6 85ºC
0
0 1 23 4 5
ENABLE VOLTAGE [V]
0.4
3.0
3.5 4.0 4.5 5.0
INPUT VOLTAGE [V]
5.5
Power Up from Shutdown
Power Down
PWM 200 Hz, 1% Duty Cycle
Doc. No. MD-5041 Rev. B
6 © 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice


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700mA Quad Channel Constant Current LED Driver

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PIN DESCRIPTIONS
Name
LED1
LED2
LED3
LED4
GND
EN/PWM
VIN
RSET
Pin
SOIC 8-Lead
1
2
3
4
5
6
7
8
Pin
TDFN 8-Lead
1
2
3
4
5 and TAB
6
7
8
Function
LED1 cathode terminal
LED2 cathode terminal
LED3 cathode terminal
LED4 cathode terminal
Ground reference
Device enable input and PWM control
Device supply pin
LED current set pin for the LED channels
CAT4104
PIN FUNCTION
VIN is the supply pin for the device. A small 0.1 μF
ceramic bypass capacitor is optional for noisy
environments. Whenever the input supply falls below
the under-voltage threshold, all LED channels are
automatically disabled.
EN/PWM is the enable and one wire dimming input
for all LED channels. Guaranteed levels of logic high
and logic low are set at 1.3 V and 0.4 V respetively.
When EN/PWM is initially taken high, the device
becomes enabled and all LED currents are set at a
gain of 100 times the current in RSET. To place the
device into zero current shutdown mode, the
EN/PWM pin must be held low for 4 ms typical.
LED1 to LED4 provide individual regulated currents
for each of the LED cathodes. There pins enter a high
impedance zero current state whenver the device is
placed in shutdown mode.
RSET pin is connected to an external resistor to set
the LED channel current. The ground side of the
external resistor should be star connected to the
GND of the PCB. The pin source current mirrors the
current to the LED sinks. The voltage at this pin is
regulated to 1.2 V.
GND is the ground reference for the device. The pin
must be connected to the ground plane on the PCB.
TAB (TDFN 8-Lead Only) is the exposed pad
underneath the package. For best thermal
performance, the tab should be soldered to the PCB
and connected to the ground plane.
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
7
Doc. No. MD-5041 Rev. B


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700mA Quad Channel Constant Current LED Driver

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BLOCK DIAGRAM
VIN
VIN
EN/PWM
RSET
LED1 LED2 LED3 LED4
1.2 V Reference
Current Setting
4 Current Sink
Regulators
GND
Figure 2. CAT4104 Functional Block Diagram
BASIC OPERATION
The CAT4104 has four tightly matched current sinks
to regulate LED current in each channel. The LED
current in the four channels is mirrored from the
current flowing through the RSET pin according to the
following formula:
ILED
100 × 1.2 V
R SET
Table 1 shows standard resistor values for RSET and
the corresponding LED current.
Table 1. RSET Resistor Settings
LED Current [mA]
20
60
100
175
RSET [k]
6.34
2.10
1.27
0.768
Tight current regulation for all channels is possible
over a wide range of input voltages and LED voltages
due to independent current sensing circuitry on each
channel.
Each LED channel needs a minimum of 400 mV
headroom to sink constant regulated current up to
175 mA. If the input supply falls below 2 V, the under-
voltage lockout circuit disables all LED channels. Any
unused LED channels should be left open.
For applications requiring more than 175 mA current,
LED channels can be tied together to sink up to a
total of 700 mA from the one device.
The LED channels can withstand voltages up to 25 V.
This makes the device ideal for driving long strings of
high power LEDs from a high voltage source.
Doc. No. MD-5041 Rev. B
8 © 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice


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APPLICATION INFORMATION
SINGLE 12 V SUPPLY
The circuit shown in Figure 3 shows how to power the
LEDs from a single 12 V supply using the CAT4104.
Three external components are needed to create a
lower voltage necessary for the VIN pin (below 5.5 V).
The resistor R2 and zener diode Z provide a
regulated voltage while the quiescent current runs
through the N-Channel transistor M. The
recommended parts are ON Semiconductor
MM3Z6V2 zener diode (in SOD-323 package), and
2N7002L N-Channel transistor (in SOT23).
12V
C2
1µF
R2
5k
Z
6.2V
C1
0.1µF
M
VIN LED1
CAT4104
LED2
EN/PWM LED3
RSET
LED4
R1 GND
Figure 3. Single Supply Driving 12 LEDs
DAYLIGHT DETECTION
The circuit in Figure 4 shows how to use CAT4104 in
an automatic light sensor application. The light sensor
allows the CAT4104 to be enabled during the day and
disabled during the night. Two external components
are required to configure the part for ambient light
detection and conserve power. Resistor R1 sets the
bias for the light sensor. The recommended part is
Microsemi LX1972 light sensor. For best
performance, the LED light should not interfere with
the light sensor.
5V
C2
1 µF
R1
100 k
VDD
Light
Sensor
VSS
C1
0.1 µF
VIN LED1
CAT4104
LED2
OFF ON
LED3
EN/PWM
RSET
LED4
R1 GND
Figure 4. Daylight Detection
CAT4104
NIGHTLIGHT DETECTION
The circuit shown in Figure 5 illustrates how to use
the CAT4104 in an automatic night light application.
The light sensor allows the CAT4104 to be disabled
during the day and enabled during the night. Five
external components are needed to properly
configure the part for night detection. Resistor R3
limits the quiescent current through the N-Channel
transistor M. Resistors R1 and R2 act as a voltage
divider to create the required voltage to turn on
transistor M, which disables the CAT4104. The
recommended parts are ON Semiconductor 2N7002L
N-Channel transistor (in SOT23) and the Microsemi
LX1972 light sensor. For best performance, the LED
light should not interfere with the light sensor.
5V
C2
1 µF
R1
100 k
VDD
Light
Sensor
VSS
R2
1 M
R3
100 k
C1
0.1 µF
VIN LED1
CAT4104
LED2
OFF ON
LED3
EN/PWM
M
R4
RSET LED4
GND
Figure 5. Night Detection
LED CURRENT DERATING
The circuit shown in Figure 6 provides LED tempe-
rature derating to avoid over-driving the LED under
high ambient temperatures, by reducing the LED
current to protect the LED from over-heating. The
positive thermo coefficient (PTC) thermistor RPTC is
used for temperature sensing and should be located
near the LED. As the temperature of RPTC increases,
the gate voltage of the MOSFET M1 decreases. This
causes the transistor M1 on-resistance to increase
which results in a reduction of the LED current. The
circuit is powered from a single VCC voltage of 5 V.
The recommended parts are Vishay 70ºC thermistor
PTCSS12T071DTE and ON Semiconductor 2N7002L
N-Channel transistor (in SOT23).
The PCB and heatsink for the LED should be designed
such that the LED current is constant within the normal
temperature range. But as soon as the ambient
temperature exceeds a max threshold, the LED current
drops to protect the LEDs from overheating.
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
9
Doc. No. MD-5041 Rev. B


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700mA Quad Channel Constant Current LED Driver

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VCC
5V
C2
1 µF
RPTC
C1
0.1 µF
VIN LED1
CAT4104
LED2
EN/PWM LED3
R1
1436
RSET
LED4
GND
R2
5 k
M1
350 mA
Figure 6. LED Current Derating
POWER DISSIPATION
The power dissipation (PD) of the CAT4104 can be
calculated as follows:
( ) ( )PD = VIN × IIN + Σ VLEDN × ILEDN
where VLEDN is the voltage at the LED pin, and ILEDN is
the LED current. Combinations of high VLEDN voltage
and high ambient temperature can cause the
CAT4104 to enter thermal shutdown. In applications
where VLEDN is high, a resistor can be inserted in
series with the LED string to lower the power
dissipation PD.
Thermal dissipation of the junction heat consists
primarily of two paths in series. The first path is the
junction to the case (θJC) thermal resistance which is
defined by the package style, and the second path is
the case to ambient (θCA) thermal resistance, which is
dependent on board layout. The overall junction to
ambient (θJA) thermal resistance is equal to:
θJA = θJC + θCA
For a given package style and board layout, the
operating junction temperature TJ is a function of the
power dissipation PD, and the ambient temperature,
resulting in the following equation:
TJ = TAMB + PD (θJC + θCA) = TAMB + PD θJA
When mounted on a double-sided printed circuit
board with two square inches of copper allocated for
“heat spreading”, the resulting θJA is about 90°C/W for
the TDFN-8 package, and 160°C/W for the SOIC-8
package.
For example, at 60°C ambient temperature, the
maximum power dissipation for the TDFN-8 is
calculated as follow:
PDmax
=
TJmax - TAMB
θJA
= 150 - 60
90
=1W
RECOMMENDED LAYOUT
A small ceramic capacitor should be placed as close
as possible to the driver VIN pin. The RSET resistor
should have a Kelvin connection to the GND pin of
the CAT4104.
The board layout should provide good thermal
dissipation through the PCB. In the case of the
CAT4104VP2 in the TDFN package, a via can be
used to connect the center tab to a large ground
plane underneath as shown on figure 7.
Figure 7. CAT4104 Recommended Layout
Doc. No. MD-5041 Rev. B
10 © 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice


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PACKAGE OUTLINE DRAWINGS
SOIC 8-Lead 150 mil (V) (1)(2)
0F0F
E1 E
PIN # 1
IDENTIFICATION
TOP VIEW
D
eb
SIDE VIEW
A1
A
CAT4104
SYMBOL
A
A1
b
c
D
E
E1
e
h
L
θ
MIN
NOM
MAX
1.35 1.75
0.10 0.25
0.33 0.51
0.19 0.25
4.80 5.00
5.80 6.20
3.80 4.00
1.27 BSC
0.25 0.50
0.40 1.27
0º 8º
h
θ
L
END VIEW
c
For current Tape and Reel information, download the PDF file from:
http://www.catsemi.com/documents/tapeandreel.pdf.
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC standard MS-012.
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
11
Doc. No. MD-5041 Rev. B


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700mA Quad Channel Constant Current LED Driver

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TDFN 8-Pad 2 mm x 3 mm (VP2) (1)(2)
1F1F
D
A
eb
E
PIN#1 INDEX AREA
TOP VIEW
E2
PIN#1
IDENTIFICATION
A1
SIDE VIEW
D2
BOTTOM VIEW
L
SYMBOL
A
A1
A2
A3
b
D
D2
E
E2
e
L
MIN
0.70
0.00
0.45
0.20
1.90
1.30
2.90
1.20
0.20
NOM
0.75
0.02
0.55
0.20 REF
0.25
2.00
1.40
3.00
1.30
050 TYP
0.30
MAX
0.80
0.05
0.65
0.30
2.10
1.50
3.10
1.40
0.40
A2
A3
FRONT VIEW
For current Tape and Reel information, download the PDF file from:
http://www.catsemi.com/documents/tapeandreel.pdf.
Notes:
(1) All dimensions are in millimeters.
(2) Complies with JEDEC standard MO-229.
Doc. No. MD-5041 Rev. B
12
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice


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EXAMPLE OF ORDERING INFORMATION(1)
2F2F
Prefix Device # Suffix
CAT 4104
V
– G T3
Company ID
Product Number
4104
Package
V: SOIC
VP2: TDFN
Lead Finish
G: NiPdAu
Tape & Reel
T: Tape & Reel
3: 3,000/Reel
CAT4104
Notes:
(1) All packages are RoHS-compliant (Lead-free, Halogen-free).
(2) The standard plated finish is NiPdAu.
(3) The device used in the above example is a CAT4104V-GT3 (SOIC, NiPdAu, Tape & Reel, 3,000/Reel).
(4) For additional temperature options, please contact your nearest ON Semiconductor Sales office.
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
13
Doc. No. MD-5041 Rev. B


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REVISION HISTORY
Date
26-Feb-09
13-Mar-09
Revision
A
B
Description
Initial Issue
Updated Electrical Operating Characteristics
Added new Typical Performance Characteristics
Updated Block Diagram
Updated Application Information
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to
any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights
nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
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Doc. No. MD-5041 Rev. B
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