CAT4002B, CAT4003B,
CAT4004B
Constant Current
Programmable LED Driver
with 32 Dimming Levels
Description
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The CAT4002B, CAT4003B and CAT4004B provide respectively
two, three and four matched low dropout current sources to drive
LEDs. The CAT400XB requires no external RSET resistor. The LED
current is internally set to 25 mA when the device is first enabled.
Each LED channel includes an individual control loop allowing the
device to handle a wide range of LED forward voltages while still
maintaining tight current matching.
The EN/DIM logic input supports the device enable and a digital
dimming interface for setting the LED channel current with 32 linear
dimming levels.
LEDs can be powered directly from a Lithium−ion battery due to the
low dropout (75 mV at 20 mA) current sinks.
Package options are available in the 4−channel tiny 8−pad UDFN
2 mm x 2 mm with a max height of 0.55 mm, and 2 or 3− channel in
the 6−lead TSOT−23 and SC−70.
Features
UDFN−8
HU2 SUFFIX
CASE 517AW
TSOT23−6
TD SUFFIX
CASE 419AF
SC70−6
SD SUFFIX
CASE 419AD
TYPICAL APPLICATION CIRCUIT
VIN
2.4 V
to
5.5 V
C
IN
1
mF
VIN
CAT4002B
One Wire
Programming
32 Steps
LED1
LED2
•
•
•
•
•
•
•
•
•
•
2, 3, 4 LED Current Sinks with Tight Matching
32 Dimming Levels
Low Dropout Driver 75 mV at 20 mA
No Switching Noise
Shutdown Current less than 1
mA
25 mA Max LED Current per Channel
Dimming via 1−wire EZDimt Interface
Thermal Shutdown Protection
RoHS Compliant
6−lead TSOT−23, SC−70, and 8−pad UDFN 2 mm x 2 mm Packages
EN/DIM
GND
Typical Applications
•
LCD Display Backlight
•
Cellular Phones
•
Digital Still Cameras
ORDERING INFORMATION
See detailed ordering information on page 2 of this data
sheet.
©
Semiconductor Components Industries, LLC, 2011
June, 2011
−
Rev. 4
1
Publication Order Number:
CAT4002B/D
CAT4002B, CAT4003B, CAT4004B
MARKING DIAGRAMS
BHA
YM
VKYM
VHA
UDFN8 (2 x 2 mm)
BH
A
Y
M
= CAT4004B Device Code
= Assembly Location Code
= Production Year (last digit)
= Production Month: 1
−
9, O, N, D
TSOT23−6L
SC70−6L
KLYM
KLA
TSOT23−6L
VK
KL
Y
M
= CAT4002B Device Code
= CAT4003B Device Code
= Production Year (last digit)
= Production Month: 1
−
9, O, N, D
SC70−6L
VH = CAT4002B Device Code
KL = CAT4003B Device Code
A
= Assembly Location Code
ORDERING INFORMATION
(Note 1)
Orderable Part Number
CAT4002BTD−GT3
CAT4002BSD−GT3
CAT4003BTD−GT3
CAT4003BSD−GT3
CAT4004BHU2−GT3
Package
TSOT−23, 6−Lead
SC−70, 6−Lead
TSOT−23, 6−Lead
SC−70, 6−Lead
UDFN, 8−Pad, 2 x 2 mm
Finish
NiPdAu (RoHS Compliant)
NiPdAu (RoHS Compliant)
NiPdAu (RoHS Compliant)
NiPdAu (RoHS Compliant)
NiPdAu (RoHS Compliant)
Shipping
(Note 2)
3,000 / Tape & Reel
3,000 / Tape & Reel
3,000 / Tape & Reel
3,000 / Tape & Reel
3,000 / Tape & Reel
1. For additional package and temperature options, please contact your nearest ON Semiconductor Sales office.
2. For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
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2
CAT4002B, CAT4003B, CAT4004B
PIN CONNECTIONS
(Top View)
1
EN/DIM
GND
LED1
LED2
VIN
NC
LED4
LED3
1
EN/DIM
GND
VIN
CAT4003B
TSOT23−6L
1
EN/DIM
GND
VIN
CAT4002B
TSOT23−6L
LED1
NC
LED2
LED1
GND
EN/DIM
CAT4002B
SC70−6L
1
LED1
LED2
LED3
LED1
GND
EN/DIM
CAT4003B
SC70−6L
1
LED2
LED3
VIN
CAT4004B
UDFN8 2 x 2 mm
LED2
NC
VIN
Table 1. PIN FUNCTIONS
Pin Name
EN/DIM
GND
LED1
LED2
LED3
LED4
VIN
TAB
Function
Device Enable (active high) and Dimming Control
Ground Reference
LED1 Cathode Terminal
LED2 Cathode Terminal
LED3 Cathode Terminal
LED4 Cathode Terminal
Device Supply Input, Connect to Battery or Supply
Connect to GND on the PCB, for CAT4004B only.
Table 2. ABSOLUTE MAXIMUM RATINGS
Parameter
VIN, LEDx Voltage
EN/DIM Voltage
Storage Temperature Range
Junction Temperature Range
Lead Temperature
Value
6
VIN + 0.7
−65
to +160
−40
to +125
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 3. RECOMMENDED OPERATING CONDITIONS
Parameter
VIN
Ambient Temperature Range
LED Current Range
3. Typical application circuit with external components is shown on page 1.
Value
2.4 to 5.5
−40
to +85
0 to 25
Unit
V
°C
mA
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3
CAT4002B, CAT4003B, CAT4004B
Table 4. ELECTRICAL OPERATING CHARACTERISTICS
(over recommended operating conditions unless specified otherwise) (V
IN
= 4.0 V, EN = High, T
AMB
= 25°C)
Parameter
Quiescent Current
Shutdown Current
Full Scale LED Current (Average) (Note 4)
LED Channel Matching
Conditions
I
LED
= 25 mA/channel
V
EN
= 0 V
Symbol
I
Q
I
QSHDN
I
LED−FULL
24
−5
25
±1
I
LED−DEV
Min
0.5
Typ
0.7
Max
1.5
1
26
+5
Units
mA
mA
mA
%
I
LED
*
I
LEDAVG
I
LEDAVG
I
LED
= 20 mA
I
LED
= 1 mA
Dropout Voltage
EN/DIM Pin
−
Internal pull−down resistor
−
Logic High Level
−
Logic Low Level
Thermal Shutdown
Thermal Hysteresis
Undervoltage lockout (UVLO) threshold
V
DOUT
75
45
200
1.3
0.4
150
20
2.0
mV
R
EN/DIM
V
HI
V
LO
T
SD
T
HYS
V
UVLO
kW
V
V
°C
°C
V
4. For the CAT4004B, I
LEDAVG
= (I
LED,CH1
+ I
LED,CH2
+ I
LED,CH3
+ I
LED,CH4
) / 4
For the CAT4003B, I
LEDAVG
= (I
LED,CH1
+ I
LED,CH2
+ I
LED,CH3
) / 3
For the CAT4002B, I
LEDAVG
= (I
LED,CH1
+ I
LED,CH2
) / 2
5. The standard lead finish is NiPdAu.
Table 5. RECOMMENDED EN/DIM TIMING
(For 2.4 V
≤
V
IN
≤
5.5 V, over full ambient temperature range
−40°C
to +85°C.)
Parameter
EN/DIM program low time
EN/DIM program high time
LED current settling time
EN/DIM low time to shutdown
T
HI
EN/DIM
T
LO
T
LED
100%
LED
Current
97% 94%
32 Levels
3%
0%
100%
Shutdown
T
PWRDWN
Conditions
Symbol
T
LO
T
HI
T
LED
T
PWRDWN
2
Min
0.2
0.2
10
3
5
Typ
Max
100
Units
ms
ms
ms
ms
Shutdown
Figure 1. CAT400XB EN/DIM Dimming Timing Diagram
LED Current Setting
On the CAT400XB, the full scale LED current is
internally set to 25 mA (no external resistor).
When the EN/DIM is first enabled, the CAT400XB sets
the LED channel current to the full scale current. Each
consecutive rising edge on the EN/DIM decreases the LED
current by one step until it goes to zero, as shown on
Figure 1.
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CAT4002B, CAT4003B, CAT4004B
TYPICAL CHARACTERISTICS
(CAT4003B, V
IN
= 4 V, V
F
= 3.3 V, I
OUT
= 75 mA (3 LEDs at 25 mA), C
IN
= 1
μF,
T
AMB
= 25°C unless otherwise specified.)
1.4
ENABLE HIGH THRESHOLD [V]
1.2
1.0
0.8
0.6
80°C
0.4
2.0 2.5
3.0
3.5
4.0
4.5
5.0
5.5
−40°C
25°C
QUIESCENT CURRENT [mA]
1.4
1.2
1.0
0.8
0.6
INPUT VOLTAGE [V]
2.5 3.0
3.5
4.0
4.5
5.0
5.5
INPUT VOLTAGE [V]
Figure 2. EN High Threshold vs. Input Voltage
Figure 3. Quiescent Current vs. Input Voltage
(full load)
1.0
LED CURRENT CHANGE [%]
0.6
0.4
0.2
0.0
−0.2
−0.4
−0.6
−0.8
−1.0
LED CURRENT CHANGE [%]
2.5 3.0
3.5
4.0
4.5
5.0
5.5
0.8
10
8
6
4
2
0
−2
−4
−6
−8
−10
−40
0
40
80
120
INPUT VOLTAGE [V]
TEMPERATURE [°C]
Figure 4. LED Current Change vs. Input Voltage
Figure 5. LED Current Change vs. Temperature
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