CAT4106
6 W Quad Channel DC/DC
LED Driver with Diagnostics
Description
The CAT4106 is an integrated multi−channel LED driver and high
power DC/DC converter suitable for powering backlighting
applications up to a total of 6 watts. Up to four matched LED strings
can be accurately programmed with uniform drive current set by a
single external resistor. Each output channel is suitable for LED string
voltages of up to 36 V. The driver automatically adjusts the output
voltage to drive the highest forward voltage string with the minimum
headroom voltage maximizing the efficiency.
High resolution dimming control is achieved by the EN/PWM logic
pin which supports multiple frequencies. This ensures precise PWM
dimming control while the device remains fully biased. In addition,
when held at logic low, the device to enter a full shutdown “zero”
current mode.
External programming resistors set the minimum and maximum
voltage limits for the acceptable “window of operation” for LED
strings. Any channel which fails to regulate within the window (Open
or Short LED) is detected and flagged on the FAULT logic output
(active low, open−drain).
The device is available in a 16−lead TQFN 4 mm x 4 mm and
TSSOP with exposed pad packages.
Features
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TQFN−16
HV4 SUFFIX
CASE 510AE
1
TSSOP−16
YP SUFFIX
CASE 948AP
PIN CONNECTIONS
1
LED1
GND
FAULT
PGND
FB
SW
EN/PWM
NC
LED2
LED3
LED4
RSET
VFMAX
VFMIN
CTRL
VIN
TAB
is
GND
RSET
LED4
LED3
LED2
•
•
•
•
•
•
•
•
•
•
•
•
Four LED Channels with Tight Current Matching
Integrated DC/DC Boost Converter
Up to 6 W LED Total Output Power
Up to 92% Efficiency
Low Dropout LED Channels (500 mV at 175 mA)
High Frequency PWM Interface (up to 2 kHz)
Adjustable Short/Open LED Detection
Programmable LED Channel Current
Adjustable LED Channel Voltage
Thermal Shutdown Protection
16−lead TQFN 4 x 4 mm and TSSOP Packages
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
1
LED1
GND
FAULT
PGND
TAB
is
GND
NC
EN/PWM
SW
FB
(Top Views)
VFMAX
VFMIN
CTRL
VIN
MARKING DIAGRAMS
4106Y
CDAL
Applications
CDAL = CAT4106HV4−GT2
4106Y = CAT4106YP−T2
•
LCD Backlight Lighting
•
Automotive and General Purpose Lighting
ORDERING INFORMATION
Device
CAT4106HV4−GT2
(Note 1)
CAT4106YP−T2
(Note 1)
Package
TQFN−16
(Pb−Free)
TSSOP−16
(Pb−Free)
Shipping
2,000/
Tape & Reel
2,000/
Tape & Reel
1. NiPdAu Plated Finish (RoHS−compliant)
2. Matte−Tin Plated Finish (RoHS−compliant)
©
Semiconductor Components Industries, LLC, 2014
1
June, 2014 − Rev. 4
Publication Order Number:
CAT4106/D
CAT4106
V
L
3 V to 24 V
V
IN
3 V to 5.5 V C1
1
mF
OFF... ON... DIM
C2
4.7
mF
VIN
L
47
mH
D
C3
10
mF/
50 V
SW VFMAX
VFMIN
CAT4106
EN/PWM
RSET
R5
R7
R4
R6
R1
LED1
LED2
LED3
20 kW
R2
LED4
CTRL
FAULT
FB GND PGND
R3
20 kW
V
IN
R8
LED Fault Detection
(open drain pull−down)
Figure 1. Typical Application Circuit
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameters
VIN, RSET, EN/PWM, CTRL, FB, FAULT
VFMIN, VFMAX
LED1, LED2, LED3, LED4
SW (internally clamped to 40 V)
Storage Temperature Range
Junction Temperature Range
Lead Temperature
Ratings
−0.3 V to 6
−0.3 V to 6
−0.3 V to 25
50
−65 to +150
−40 to +150
300
Units
V
V
V
V
_C
_C
_C
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
Table 2. RECOMMENDED OPERATING CONDITIONS
Parameter
VIN
Inductor Drive Voltage
LED String Forward Voltage per channel
Ambient Temperature Range
I
LED
per LED pin
Range
3.0 to 5.5
3.0 to 24
up to 36
−40 to +85
10 to 175
Units
V
V
V
_C
mA
Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond
the Recommended Operating Ranges limits may affect device reliability.
3. Typical application circuit with external components is shown above.
Table 3. RECOMMENDED EN/PWM TIMING
Symbol
T
LEDSETUP
T
LO
T
HI
T
PWRDWN
T
LEDSET
Name
LED setup time from shutdown
EN/PWM low time
EN/PWM high time
(For 3.0
≤
VIN
≤
5.5 V, over full ambient temperature range −40 to +85°C.)
Conditions
Min
10
0.2
100
8
I
LED
= 100 mA
0.2
Typ
40
Max
100
2000
Units
ms
ms
ms
ms
ms
EN/PWM low time to shutdown delay
LED current settling time
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CAT4106
T
LEDSETUP
EN/PWM
SHUTDOWN
100% BRIGHTNESS
DIMMING
POWERDOWN
SHUTDOWN
T
HI
T
LO
T
PWRDWN
LED CURRENT
DEVICE
QUIESCENT CURRENT
Figure 2. CAT4106 EN/PWM Timing
Table 4. ELECTRICAL OPERATING CHARACTERISTICS
VIN = 5 V, VL (inductor drive voltage) = 12 V, T
AMB
= 25°C (over recommended operating conditions unless specified otherwise)
Symbol
I
Q
Description
VIN Operating Current
Conditions
Switching
Not Switching
Switching
Not Switching
V
EN
= 0 V
Device Enable Level
Disable/PWM Level
0.8
0.7
200
2.0
150
20
10
mA
< I
RSET
< 2 mA
30 mA LED current
I
LED
= 175 mA
0.5 V < V
LED
< 5 V
Channel is Off
1.15
1.15
Offset to Lowest LED output
FAULT is Active (0.1 V bias)
FAULT is Inactive
Normal switching
mode regulation
− 0.1
25
1
285
1.20
1.20
0
2
1
300
315
1
1.3
−5
1.17
1.20
100
0.5
±1
+5
1
1.25
1.25
+ 0.1
V
%
mA
V
V
V
mA
mA
mA
mV
mA
MHz
A
W
%
%
mA
V
1.23
(I
LED
= 30 mA)
(I
LED
= 30 mA)
(I
LED
= 60 mA)
(I
LED
= 60 mA)
Min
Typ
2.5
2.0
3.4
2.9
Max
3.5
3.0
4.4
3.9
1
1.3
300
Units
mA
I
SD
V
IH
V
IL
R
EN
V
UVLO
T
SD
T
HYS
V
RSET
I
LED
/I
RSET
V
DO
DI
LED
I
LED−OFF
V
VFMAX
V
VFMIN
V
CTRL
I
CTRL
I
FAULT
V
FB
I
FB
F
SW
I
SWMAX
R
SW
DC
MAX
DC
MIN
I
SWLEAK
OVP
SW
VIN input shutdown Current
EN/PWM
Logic High Threshold
Logic Low Threshold
Internal Pull−Down Resistor
Undervoltage lockout (UVLO)
Thermal Shutdown Threshold
Thermal Hysteresis
RSET regulation voltage
RSET to LED Current gain ratio
LED Channel Dropout Voltage
LED Channel Matching
LED Channel leakage
O/C Detect voltage threshold
S/C Detect voltage threshold
CTRL pin voltage accuracy
CTRL pin maximum load
Pull−down Drive Current
Open Drain Leakage Current
FB Pin control voltage
FB pin input leakage current
SW Pin
Switching Frequency
Switch Pin Current Limit
Switch Pin On−resistance
Maximum Duty Cycle
Minimum Duty Cycle
Switch Leakage Current
Over Voltage Protection Detect
mA
V
V
kW
V
_C
_C
V
0.4
100
VIN pin voltage
0.7
0.8
I
SW
= 500 mA
Prior to Current Limiting
Prior to Pulse−Skipping
V
SW
= 20 V
Enters Low Power mode
1.0
1.0
1.0
96
5
40
5
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
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CAT4106
TYPICAL ELECTRICAL OPERATING CHARACTERISTICS
(VIN = 5 V, VL = 12 V, T
AMB
= 25°C, typical application circuit unless otherwise specified.)
8
QUIESCENT CURRENT (mA)
1.30
switching
4
not switching
2
RSET VOLTAGE (V)
1.5
2.0
6
1.25
1.20
1.15
0
0
0.5
1.0
RSET CURRENT (mA)
1.10
3.0
3.5
4.0
4.5
5.0
5.5
VIN SUPPLY (V)
Figure 3. Quiescent Current vs. RSET Current
1.30
140
Figure 4. RSET Voltage vs. VIN Supply
RSET VOLTAGE (V)
1.25
120
1.20
GAIN
0
50
TEMPERATURE (°C)
100
150
100
1.15
80
1.10
−50
60
20
60
100
LED CURRENT (mA)
140
180
Figure 5. RSET Voltage vs. Temperature
200
175
LED CURRENT (mA)
LED CURRENT (mA)
150
125
100
75
50
25
0
0
0.2
0.4
0.6
0.8
1.0
LED PIN VOLTAGE (V)
200
175
150
125
100
75
50
25
0
3.0
Figure 6. I
LED
/I
RSET
Gain vs. LED Current
3.5
4.0
4.5
5.0
5.5
VIN SUPPLY (V)
Figure 7. LED Channel Current vs. LED Pin
Voltage
Figure 8. LED Channel Current vs. VIN Supply
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CAT4106
TYPICAL ELECTRICAL OPERATING CHARACTERISTICS
(VIN = 5 V, VL = 12 V, T
AMB
= 25°C, typical application circuit unless otherwise specified.)
0.9
30
0.7
FAULT DRIVE R
DSON
(W)
R2 = R3 = 24 kW
LED PIN VOLTAGE (V)
0.8
25
20
0.6
15
0.5
0.4
3.0
3.5
4.0
4.5
5.0
5.5
VIN SUPPLY (V)
10
5
3.0
3.5
4.0
4.5
5.0
5.5
VIN SUPPLY (V)
Figure 9. LED Channel Voltage vs. VIN Supply
2.0
SWITCHING FREQUENCY (MHz)
SWITCH RESISTANCE (W)
1.2
Figure 10. FAULT Drive R
DSON
vs. VIN Supply
1.5
1.1
1.0
1.0
0.5
0.9
0
3.0
3.5
4.0
4.5
5.0
5.5
VIN SUPPLY (V)
0.8
3.0
3.5
4.0
4.5
5.0
5.5
VIN SUPPLY (V)
Figure 11. Switch Resistance vs. VIN Supply
1200
SW CURRENT LIMIT (mA)
1100
1000
900
800
700
600
3.0
3.5
4.0
4.5
5.0
5.5
VIN SUPPLY (V)
POWERDOWN DELAY (ms)
5
Figure 12. Switching Frequency vs. VIN
Supply
4
3
2
1
0
3.0
3.5
4.0
4.5
5.0
5.5
VIN SUPPLY (V)
Figure 13. Switching Current Limit vs. VIN
Supply
Figure 14. Powerdown Delay vs. VIN Supply
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