CAT3603
3-Channel LED Driver in
3 x 3 mm Package
Description
The CAT3603 is a charge pump LED driver operating in either 1x
(LDO) mode or 1.5x fractional mode regulating current through each
of the 3 LED pins. Operation at a constant switching frequency of
1 MHz allows the use of very small value ceramic capacitors.
The CAT3603 drives 3 white LEDs in parallel and provides tightly
matched regulated current to achieve uniform brightness in LCD
backlighting applications. An external resistor, RSET, controls the
output current level. The device can deliver up to 30 mA over an input
voltage supply range from 3 V to 5.5 V, making it ideal for battery−
powered applications.
LED dimming can be accomplished using several methods; using a
DC voltage to set the RSET pin current, applying a PWM signal on the
EN pin, or adding a switched resistor in parallel with RSET. The EN
input pin allows the device to be placed in power−down mode with
“near−zero” quiescent current.
The device is available in the tiny 12−lead thin DFN 3 mm x 3 mm
package with a max height of 0.8 mm.
Features
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TDFN−12
HV2 SUFFIX
CASE 511AN
PIN CONNECTIONS
LED1
LED2
LED3
RSET
EN
VOUT
(Top View)
1
GND
C2+
C2−
C1−
C1+
VIN
•
•
•
•
•
•
•
•
•
•
•
•
•
Drives up to 3 LEDs
Current Setting Resistor
Compatible with Supply Voltage of 3 V to 5.5 V
Power Efficiency up to 91%
Output Current up to 30 mA per LED
Fractional Pump 1x/1.5x
Low Noise Input Ripple
Fixed High Frequency Operation 1 MHz
“Zero” Current Shutdown Mode
Soft Start and Current Limiting
Short Circuit Protection
12−lead TDFN 3 mm x 3 mm Package
This Device is Pb−Free, Halogen Free/BFR Free and RoHS
Compliant
LCD Display Backlight
Cellular Phones
Digital Still Cameras
Handheld Devices
MARKING DIAGRAM
HABB
HABB = CAT3603 Device Code
ORDERING INFORMATION
Device
CAT3603HV2
Package
TDFN−12
(Pb−Free)
Green*
Shipping
2,000/Tape & Reel
Applications
•
•
•
•
* Lead Finish Matte−Tin
©
Semiconductor Components Industries, LLC, 2010
January, 2010
−
Rev. 5
1
Publication Order Number:
CAT3603/D
CAT3603
1
mF
C1+
CIN
1
mF
EN
RSET
23.7 kW
GND
V
IN
CAT3603
LED1
LED2
LED3
C1− C2+
1
mF
C2−
VOUT
VIN
3V
to
5.5 V
VOUT
COUT
1
mF
20 mA
OFF ON
Note:
Unused LED channels must be connected to VOUT.
Figure 1. Typical Application Circuit
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameter
VIN, VOUT, LEDx voltage
EN voltage
RSET voltage
Junction Temperature Range
Storage Temperature Range
Lead Temperature
ESD Rating HBM (Human Body Model)
ESD Rating MM (Machine Model)
Rating
−0.3
to 7.0
−0.3
to VIN
−0.3
to VIN
−40
to +150
−65
to +160
300
2,000
200
Unit
V
V
V
_C
_C
_C
V
V
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
Ambient Temperature Range
Input, Output, Bucket Capacitors
I
LED
per LED pin
1. Typical application circuit with external components is shown above.
Range
3 to 5.5
−40
to +85
1
±20%
typical
0 to 30
Unit
V
_C
mF
mA
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2
CAT3603
Table 3. ELECTRICAL OPERATING CHARACTERISTICS
(
VIN = 3.6 V, EN = High, T
AMB
= 25°C over recommended operating conditions unless otherwise stated.)
Symbol
I
Q
Parameter
Quiescent Current
Conditions
V
EN
= 0 V, shutdown mode
1x Mode, No Load
1.5x Mode, No Load
1.17
I
RSET
= 5
mA
I
RSET
= 37
mA
I
RSET
= 78
mA
0.5 mA
≤
I
LED
≤
3 mA
3 mA
≤
I
LED
≤
30 mA
(I
LED
– I
LEDAVG
) / I
LEDAVG
1x Mode
1.5x Mode, I
OUT
= 100 mA
0.8
0.4
On Input EN
On Input EN
0.4
VOUT = GND
VOUT > 1 V
30
200
0.8
0.7
45
400
150
20
2
Min
Typ
0.1
0.4
2.7
1.2
2.4
15.0
30.0
±15
±5
±3
1.4
6.5
1.0
0.6
2.5
10
1.3
0.9
1
1.3
60
600
Max
1
1
5
1.23
Units
mA
mA
mA
V
mA
V
RSET
I
LED
RSET Regulated Voltage
Programmed LED Current
I
LED−ACC
I
LED−DEV
R
OUT
f
OSC
T
DROPOUT
I
EN
V
EN
I
SC
I
LIM
T
SD
T
HYS
V
UVLO
LED Current Accuracy
LED Channel Matching
Output Resistance
(Open Loop)
Charge Pump Frequency
1x to 1.5x Mode Transition
Dropout Delay
Input Leakage Current
High Detect Threshold
Low Detect Threshold
Short Circuit Output Current
Maximum Input Current
Thermal Shutdown
Thermal Hysteresis
Undervoltage lock out (UVLO) threshold
%
%
W
MHz
ms
mA
V
mA
mA
°C
°C
V
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CAT3603
TYPICAL CHARACTERISTICS
(VIN = 3.6 V, I
OUT
= 60 mA (3 LEDs at 20 mA), C
1
= C
2
= C
IN
= C
OUT
= 1
mF,
T
AMB
= 25°C unless otherwise specified.)
100
1x Mode
90
EFFICIENCY (%)
EFFICIENCY (%)
80
70
20 mA per LED
60
50
40
15 mA per LED
1.5x Mode
90
VIN = 4 V (1x Mode)
80
70
VIN = 3.2 V (1.5x Mode)
60
50
40
100
4.2
4.0
3.8
3.6
3.4
3.2
3.0
0
20
40
60
80
100
INPUT VOLTAGE (V)
LED CURRENT (mA)
Figure 2. Efficiency vs. Input Voltage
(3 LEDs on)
0.8
QUIESCENT CURRENT (mA)
QUIESCENT CURRENT (mA)
0.8
Figure 3. Efficiency vs. Total LED Current
(3 LEDs)
0.6
0.6
0.4
0.4
0.2
LEDs Off
0
3.0
3.2
3.4
3.6
3.8
4.0
4.2
0.2
LEDs Off
0
−40
0
40
TEMPERATURE (°C)
80
120
INPUT VOLTAGE (V)
Figure 4. Quiescent Current vs. Input Voltage
(1x Mode)
6.0
QUIESCENT CURRENT (mA)
5.0
4.0
3.0
2.0
1.0
0
LEDs Off
3.0
3.2
3.4
3.6
3.8
4.0
4.2
QUIESCENT CURRENT (mA)
6.0
5.0
4.0
3.0
2.0
1.0
Figure 5. Quiescent Current vs. Temperature
(1x Mode)
0
−40
LEDs Off
0
40
TEMPERATURE (°C)
80
120
INPUT VOLTAGE (V)
Figure 6. Quiescent Current vs. Input Voltage
(1.5x Mode)
Figure 7. Quiescent Current vs. Temperature
(1.5x Mode)
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CAT3603
TYPICAL CHARACTERISTICS
(VIN = 3.6 V, I
OUT
= 60 mA (3 LEDs at 20 mA), C
1
= C
2
= C
IN
= C
OUT
= 1
mF,
T
AMB
= 25°C unless otherwise specified.)
5.0
LED CURRENT CHANGE (%)
LED CURRENT CHANGE (%)
4.0
3.0
2.0
1.0
0
−1.0
−2.0
−3.0
−4.0
−5.0
1.5x Mode
1x Mode
5.0
4.0
3.0
2.0
1.0
0
−1.0
−2.0
−3.0
−4.0
−5.0
−40
VIN = 4 V
0
40
TEMPERATURE (°C)
80
120
3.0
3.2
3.4
3.6
3.8
4.0
4.2
INPUT VOLTAGE (V)
Figure 8. LED Current Change vs. Input
Voltage
1.3
SWITCHING FREQUENCY (MHz)
1.2
1.1
1.0
0.9
0.8
0.7
SWITCHING FREQUENCY (MHz)
1.3
1.2
1.1
1.0
0.9
0.8
0.7
−40
Figure 9. LED Current Change vs.
Temperature
3.0
3.2
3.4
3.6
3.8
4.0
4.2
0
40
TEMPERATURE (°C)
80
120
INPUT VOLTAGE (V)
Figure 10. Switching Frequency vs. Input
Voltage
4
OUTPUT RESISTANCE (W)
OUTPUT RESISTANCE (W)
10
Figure 11. Switching Frequency vs.
Temperature
3
8
2
6
1
4
0
3.0
3.2
3.4
3.6
3.8
4.0
4.2
2
3.0
3.2
3.4
3.6
3.8
4.0
4.2
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Figure 12. Output Resistance vs. Input Voltage
(1x Mode)
Figure 13. Output Resistance vs. Input Voltage
(1.5x Mode)
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