CAT4104
700 mA Quad Channel
Constant Current LED Driver
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 150°C.
The device is available in the 8−pad TDFN 2 mm x 3 mm package
and the SOIC 8−Lead 150 mil wide package.
Features
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SOIC−8
V SUFFIX
CASE 751BD
TDFN−8
VP SUFFIX
CASE 511AK
PIN CONNECTIONS
LED1
LED2
LED3
LED4
SOIC 8−lead
(Top View)
LED1
LED2
LED3
LED4
TDFN 8−pad
(Top View)
1
RSET
VIN
EN/PWM
GND
1
RSET
VIN
EN/PWM
GND
•
•
•
•
•
•
•
•
•
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
TDFN 8−pad 2 x 3 mm and SOIC 8−lead Packages
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
•
Automotive Lighting
•
General and Architectural Lighting
•
LCD Backlight
VCC
3 V to 25 V
LEDs
VIN
5V
OFF ON
CAT4104
LED1
VIN
EN/PWM
RSET
LED2
LED3
LED4
175 mA
MARKING DIAGRAMS
CAT4104V
HC
CAT4104V = CAT4104V
HC = CAT4104VP2
ORDERING INFORMATION
Device
CAT4104V−GT3
(Note 1)
CAT4104VP2−GT3
(Note 1)
Package
SOIC−8
(Pb−Free)
TDFN−8
(Pb−Free)
Shipping
3,000/
Tape & Reel
3,000/
Tape & Reel
R1
768
W
GND
Figure 1. Typical Application Circuit
1. Lead Finish is NiPdAu
©
Semiconductor Components Industries, LLC, 2010
March, 2010
−
Rev. 2
1
Publication Order Number:
CAT4104/D
CAT4104
Table 1. 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
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
Table 2. RECOMMENDED OPERATING CONDITIONS
Parameter
VIN
Voltage applied to LED1 to LED4, outputs off
Voltage applied to LED1 to LED4, outputs on
Ambient Temperature Range
I
LED
per LED pin
Rating
3.0 to 5.5
up to 25
up to 6 (Note 2)
−40
to +85
10 to 175
Unit
V
V
V
_C
mA
2. Keeping LEDx pin voltage below 6 V in operation is recommended to minimize thermal dissipation in the package.
NOTE: Typical application circuit with external components is shown on page 1.
Table 3. ELECTRICAL OPERATING CHARACTERISTICS
(Min and Max values are over the recommended operating conditions
unless specified otherwise. Typical values are at VIN = 5.0 V, T
AMB
= 25°C.)
Symbol
I
LED−ACC
I
LED−DEV
V
DOUT
V
RSET
I
Q
I
QSHDN
R
EN/PWM
V
HI
V
LO
T
SD
T
HYS
I
LED
/I
RSET
V
UVLO
Name
LED Current Accuracy
Conditions
I
LEDNOM
*
I
LED
I
LEDNOM
I
LED
*
I
LEDAVG
I
LEDAVG
I
LED
= 175 mA
1.17
No LED, RSET = Float
No LED, RSET = 770
W
V
EN
= 0 V
200
1.3
0.4
150
20
25 mA LED current
100
2.0
V
−5
Min
Typ
±2
±1
400
1.2
0.6
6
1
1.23
+5
Max
Units
%
LED Channel Matching
(Note 3)
%
Dropout Voltage
RSET Pin Voltage
Quiescent Current
Shutdown Current
EN/PWM Pin
−
Internal pull−down resistance
−
Logic High Level
−
Logic Low Level
Thermal Shutdown
Thermal Hysteresis
RSET to LED Current gain ratio
Undervoltage lockout (UVLO) threshold
mV
V
mA
mA
kW
V
V
°C
°C
3. Min and Max values are tested for I
LED
= 50 mA, VIN = 3.5 V, VLEDx = 0.4 V, T
AMB
= 25°C.
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CAT4104
Table 4. 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, T
AMB
= 25°C.)
Symbol
T
PS
T
P1
T
P2
T
R
T
F
T
LO
T
HI
T
PWRDWN
Name
Turn−On time, EN/PWM rising to I
LED
from
shutdown
Turn−On time, EN/PWM rising to I
LED
Turn−Off time, EN/PWM falling to I
LED
LED rise time
LED fall time
EN/PWM low time
EN/PWM high time
EN/PWM low time to shutdown delay
T
HI
T
LO
EN/PWM
SHUTDOWN
T
P2
T
PS
LED CURRENT
SHUTDOWN 0 mA
50%
T
P1
T
R
50%
90%
10%
0 mA
T
F
I
LED
+
1.2 V
R
SET
100
POWERDOWN
SHUTDOWN 0 mA
Conditions
I
LED
= 175 mA
I
LED
= 80 mA
I
LED
= 175 mA
I
LED
= 175 mA
I
LED
= 80 mA
I
LED
= 175 mA
I
LED
= 80 mA
I
LED
= 175 mA
I
LED
= 80 mA
1
5
4
T
PWRDWN
8
Min
Typ
1.5
1.3
600
400
300
700
440
360
320
Max
Units
ms
ns
ns
ns
ns
ms
ms
ms
QUIESCENT CURRENT
SHUTDOWN 0 mA
SHUTDOWN 0 mA
Figure 2. CAT4104 EN/PWM Timing
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 T
PS
is very short, in the range of 1
ms.
To ensure that PWM pulses are recognized, pulse width
low time T
LO
should be longer than 1
ms.
The CAT4104
enters a “zero current” shutdown mode after a 4 ms delay
(typical) when EN/PWM is held low.
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CAT4104
TYPICAL PERFORMANCE CHARACTERISTICS
(VIN = 5 V, VCC = 5 V, LED forward voltage = 3.5 V, C
IN
= 1
mF,
T
AMB
= 25°C unless otherwise specified.)
1.2
QUIESCENT CURRENT (mA)
QUIESCENT CURRENT (mA)
No Load
1.0
8
6
0.8
4
0.6
2
0.4
3.0
3.5
4.0
4.5
5.0
5.5
0
0
0.5
1.0
RSET CURRENT (mA)
1.5
2.0
INPUT VOLTAGE (V)
Figure 3. Quiescent Current vs. Input Voltage
(RSET Open)
7.0
QUIESCENT CURRENT (mA)
Full Load
LED CURRENT (mA)
6.5
200
160
120
80
40
0
Figure 4. Quiescent Current vs. RSET Current
6.0
5.5
5.0
3.0
3.5
4.0
4.5
5.0
5.5
0
0.2
0.4
0.6
0.8
1.0
INPUT VOLTAGE (V)
LED PIN VOLTAGE (V)
Figure 5. Quiescent Current vs. Input Voltage
(Full Load)
200
160
120
80
40
0
200
160
LED CURRENT (mA)
120
80
40
0
−40
Figure 6. LED Dropout vs. LED Pin Voltage
LED CURRENT (mA)
3.0
3.5
4.0
VIN (V)
4.5
5.0
5.5
0
40
TEMPERATURE (°C)
80
120
Figure 7. LED Line Regulation
Figure 8. LED Current Change vs.
Temperature
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CAT4104
TYPICAL PERFORMANCE CHARACTERISTICS
(VIN = 5 V, VCC = 5 V, LED forward voltage = 3.5 V, C
IN
= 1
mF,
T
AMB
= 25°C unless otherwise specified.)
1000
200
160
LED CURRENT (mA)
LED CURRENT (mA)
120
80
40
10
0
100
0.1
1
RSET (kW)
10
0
1
2
3
4
5
6
LED PIN VOLTAGE (V)
Figure 9. LED Current vs. RSET Resistor
1.30
1.30
Figure 10. LED Current vs. LED Pin Voltage
RSET VOLTAGE (V)
1.20
RSET VOLTAGE (V)
1.25
1.25
1.20
1.15
1.15
1.10
3.0
3.5
4.0
4.5
5.0
5.5
1.10
−40
0
40
TEMPERATURE (°C)
80
120
INPUT VOLTAGE (V)
Figure 11. RSET Pin Voltage vs. Input Voltage
1.0
0.8
0.6
0.4
0.2
Figure 12. RSET Pin Voltage vs. Temperature
LED OFF CURRENT (mA)
−40°C
25°C
125°C
0
0
5
10
15
20
25
30
LED PIN VOLTAGE (V)
Figure 13. LED Off Current vs. LED Pin
Voltage
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