CAT4002A,04A Datasheet by ON Semiconductor

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0N Semiconductor® HHFI |:H=l|:l FIFIFI HHH Figure 1. T m Semmmcmycammnen June. 2011 — Rev. 2
© Semiconductor Components Industries, LLC, 2011
June, 2011 Rev. 2
1Publication Order Number:
CAT4002A/D
CAT4002A, CAT4004A
Constant Current LED
Driver with 32 Dimming
Levels and Rset
Description
The CAT4002A and CAT4004A provide respectively two and four
matched low dropout current sources to drive LEDs. The CAT400XA
uses an external resistor RSET to set the current in the LED channels.
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 inputs supports 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 Lithiumion battery due to the
low dropout (50 mV at 20 mA) current sinks. The device is available
in the tiny 8pad UDFN 2 mm x 2 mm package with a max height of
0.55 mm, as well as the 6lead TSOT23 and SC70.
Features
2 and 4 LED Current Sinks with Tight Matching
32 Dimming Levels
Low Dropout Driver 50 mV at 20 mA
No Switching Noise
Shutdown Current less than 1 mA
LED Current set by External Resistor
Dimming via 1wire EZDimt Interface
Thermal Shutdown Protection
6lead TSOT23, SC70, and 8pad UDFN 2 mm x 2 mm Packages
These Devices are PbFree, Halogen Free/BFR Free and are RoHS
Compliant
Applications
LCD Display Backlight Digital Still Cameras
Cellular Phones Handheld Devices
Figure 1. Typical Application Circuit
CAT4004A
VIN
EN/DIM
RSET
GND
LED1 LED2 LED3 LED4
RSET
3.74 kW
One wire
programming
20 mA
1 mF
2.4 V
to
5.5 V
CIN
VIN
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ORDERING INFORMATION
SC706
SD SUFFIX
CASE 419AD
TSOT236
TD SUFFIX
CASE 419AF
UDFN8
HU2G SUFFIX
CASE 517AW
PIN CONNECTIONS
CAT4004A
UDFN8
VIN
RSET
LED4
LED3
EN/DIM
GND
LED1
LED2
1
1
RSET
LED2
EN/DIM
GND
VIN
LED1
CAT4002A
TSOT236
1
GND
LED2
VIN
RSET
LED1
EN/DIM
CAT4002A
SC706
(Top Views)
See detailed ordering and shipping information in the package
dimensions section on page 11 of this data sheet.
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2
MARKING DIAGRAMS
TSOT236UDFN8 (2 x 2 mm) SC706
BGA
YM
BG = CAT4004A Device Code
A = Assembly Location Code
Y = Production Year (last digit)
M = Production Month: 1 9, A, B, C
VL = CAT4002A Device Code
Y = Production Year (last digit)
M = Production Month: 1 9, A, B, C
VJ = CAT4002A Device Code
A = Assembly Location Code
VLYM VJA
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameter Rating Unit
VIN, LEDx, RSET 6 V
EN/DIM Voltage 6 V
Storage Temperature Range 65 to +160 °C
Junction Temperature Range 40 to +125 °C
Lead Temperature 300 °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. ELECTRICAL OPERATING CHARACTERISTICS (Min and Max values are over recommended operating conditions
unless specified otherwise. Typical values are at VIN = 4.0 V, EN/DIM = High, and TAMB = 25°C.)
Symbol Name Conditions Min Typ Max Units
IQQuiescent Current No load, RSET = Float
No load, RSET = 4.8 kW
0.2
0.5
mA
IQSHDN Shutdown Current VEN/DIM = 0 V 1mA
ILED LED Current Setting RSET = 3.0 kW25 mA
RSET = 4.99 kW15
ILEDACC LED Current Accuracy 1 mA ILED 40 mA ±1 %
ILEDDEV LED Channel Matching (Note 1) ILED *ILEDAVG
ILEDAVG
5±1 +5 %
VRSET RSET pin regulated voltage 0.57 0.6 0.63 V
VDOUT Dropout Voltage
(90% of nominal LED current)
ILED = 20 mA
ILED = 1 mA
50
25
mV
REN/DIM
VHI
VLO
EN/DIM Pin
Internal pulldown resistor
Logic High Level
Logic Low Level
1.3
200
0.4
kW
V
V
TSD Thermal Shutdown 150 °C
THYS Thermal Hysteresis 20 °C
VUVLO Undervoltage lockout (UVLO) threshold 2.0 V
1. For CAT4004A, ILEDAVG = (ILED,CH1 + ILED,CH2 + ILED,CH3 + ILED,CH4) / 4
For CAT4002A, ILEDAVG = (ILED,CH1 + ILED,CH2) / 2
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3
Table 3. RECOMMENDED OPERATING CONDITIONS
Parameter Rating Unit
VIN 2.4 to 5.5 V
Ambient Temperature Range 40 to +85 °C
ILED per LED pin 0 to 40 mA
NOTE: Typical application circuit with external components is shown on page 1.
Table 4. RECOMMENDED EN/DIM TIMING (For 2.4 V VIN 5.5 V, over full ambient temperature range 40°C to +85°C.)
Symbol Name Conditions Min Typ Max Units
TLO EN/DIM program low time 0.2 100 ms
THI EN/DIM program high time 0.2 ms
TLED LED current settling time 10 ms
TPWRDWN EN/DIM low time to shutdown 3 5 ms
100%
EN/DIM
LED
Current
Shutdown Shutdown
97% 94%
3% 0%
100%
32 Levels
Figure 2. CAT400XA EN/DIM Dimming Timing Diagram
TLED
TLO
THI
TPWRDWN
LED Current Setting
On the CAT400XA, the full scale LED current is set by the
external resistor connected between the RSET pin and
ground. Table 5 lists standard resistor values for several
LED current settings.
When the EN/DIM is initially taken high, the CAT400XA
becomes enabled and the LED channel current is set to the
full scale current according to the resistor RSET.
LED current 125 x VRSET / RSET
Table 5. RSET RESISTOR AND LED CURRENT
Full Scale
LED Current [mA] RSET [kW]
2 40.2
5 15.4
10 7.68
15 4.99
20 3.74
25 3.00
30 2.49
40 1.87
\\ \
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4
TYPICAL PERFORMANCE CHARACTERISTICS
(CAT4002A, VIN = 4 V, VF = 3.3 V, IOUT = 50 mA (2 LEDs at 25 mA), CIN = 1 mF, TAMB = 25°C unless otherwise specified.)
Figure 3. Quiescent Current vs. RSET Input
Voltage
Figure 4. Quiescent Current vs. Input Voltage
(Full Load)
RSET (kW)INPUT VOLTAGE (V)
6040200
0
0.4
0.8
1.2
1.6
2.0
5.55.04.54.03.53.02.5
0.6
0.8
1.0
1.2
1.4
Figure 5. LED Current Change vs. Input
Voltage
Figure 6. LED Current Change vs.
Temperature
INPUT VOLTAGE (V) TEMPERATURE (°C)
5.55.04.54.03.53.02.5
1.0
0.8
0.4
0.2
0
0.4
0.6
1.0
8040040
10
8
4
2
2
4
8
10
Figure 7. EN/DIM High Threshold vs. Input
Voltage
Figure 8. LED Current vs. RSET Resistor
INPUT VOLTAGE (V) RSET (kW)
5.55.04.54.03.53.02.52.0
0.4
0.8
1.0
1.4
100101
0
10
20
30
40
QUIESCENT CURRENT (mA)
QUIESCENT CURRENT (mA)
LED CURRENT CHANGE (%)
LED CURRENT CHANGE (%)
ENABLE HIGH THRESHOLD (V)
LED CURRENT (mA)
0.6
0.2
0.8
120
6
0
6
0.6
1.2
40°C
25°C
80°C
ENIDIM 5V/drv D tnput Current 50mA/div 133 Total LED Current 50mA/div l9“ EN/Dl M swaw n tnput Current 50mA/divr? Toml LED Current 50mA/div I? fins/div 2V/d iv LED pin Voltage ZODmV/dlv 1? LED Current VIN W 20mA/div w ENIDIM 5Vldlv n LED Current 10mA/dtv D 200ps/d w 1ms/div
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TYPICAL PERFORMANCE CHARACTERISTICS
(CAT4002A, VIN = 4 V, VF = 3.3 V, IOUT = 50 mA (2 LEDs at 25 mA), CIN = 1 mF, TAMB = 25°C unless otherwise specified.)
Figure 9. Dropout Characteristics Figure 10. Efficiency vs. Input Voltage
LED PIN VOLTAGE (mV) INPUT VOLTAGE (V)
3002001000
0
5
10
20
25
30
2.03.03.54.04.55.05.5
50
60
70
80
100
Figure 11. Power Up Waveform Figure 12. Power Down Waveform
Figure 13. Line Transient Waveform Figure 14. Dimming Levels
LED CURRENT (mA)
EFFICIENCY (%)
25 mA
1 mA
25015050
15
90
2.5
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Table 6. PIN DESCRIPTIONS
Name Function
EN/DIM Device enable (active high) and dimming control
GND Ground reference
LED1 LED1 cathode terminal
LED2 LED2 cathode terminal
LED3 LED3 cathode terminal (CAT4004A only)
LED4 LED4 cathode terminal (CAT4004A only)
RSET Connect external RSET resistor to set the LED current
VIN Device supply input, connect to battery or supply
TAB Connect to GND on the PCB (CAT4004A only)
Pin Function
VIN is the supply pin for the charge pump. A small 1 mF
ceramic bypass capacitor is required between the VIN pin
and ground near the device. The operating input voltage
range is from 2.5 V to 5.5 V. Whenever the input supply falls
below the undervoltage threshold (2.0 V), all the LED
channels are disabled and the device enters shutdown mode.
EN/DIM is the enable and one wire dimming input for all
LED channels. Levels of logic high and logic low are set at
1.3 V and 0.4 V respectively. When EN/DIM is initially
taken high, the CAT400XA becomes enabled and the LED
channel current is set to the full scale according to the
resistor RSET. To place the device into “zero current”
shutdown mode, the EN/DIM pin must be held low for 3 ms
typical.
LED1 to LED4 provide the internal regulated current for
each of the LED cathodes. There pins enter a high
impedance zero current state whenver the device is placed
in shutdown mode.
RSET is connected to the resistor (RSET) to set the full scale
current for the LEDs. The voltage at this pin is regulated to
0.6 V. The ground side of the external resistor should be star
connected back to the GND of the PCB. In shutdown mode,
the RSET input becomes high impedance.
GND is the ground reference for the device. The pin must be
connected to the ground plane on the PCB.
TAB (CAT4004A 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.
Block Diagram
4 Current Sink
Regulators
Current
Setting DAC
Undervoltage
Lockout
Register
Serial
Interface
RSET
100 kW
EN/DIM
GND
VIN
LED1
LED2
LED3
LED4
Reference
Voltage
Figure 15. CAT4004A Functional Block Diagram
VIN
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Basic Operation
The CAT400XA uses tightly matched current sinks to
accurately regulate LED current in each channel
proportional to the current sourced from the RSET pin.
There are 32 different settings for LED brightness that can
be programmed through the EN/DIM pin. Tight current
regulation for all channels is possible over a wide range of
input and LED voltages due to independent current sensing
circuitry on each channel.
Each LED channel needs a minimum of 50 mV headroom
to sink a constant regulated current of 20 mA. If the input
supply falls below 2.0 V typical, the undervoltage lockout
circuit disables all LED channels and resets the circuit to
default values. Any unused LED channels should be left
open.
LED Current Selection
After powerup, the LED current is set by the external
resistor (RSET) value and the number of pulses (n) on the
EN/DIM input as follows:
LED current +125 0.6 V
RSET ǒ31 *n
31 Ǔ
The full scale current is calculated from the above formula
with n equal to zero.
The EN/DIM pin has two primary functions. One function
enables and disables the device. The other function is LED
current dimming with 32 different levels by pulsing the input
signal, as shown on Figure 16. On each consecutive pulse
rising edge, the LED current is decreased by about 3.2%
(1/31th of the full scale value). After 30 pulses, the LED
current is 3.2% of the full scale current. On the 31st pulse, the
current drops to zero, and then goes back to full scale on the
following pulse.
Each pulse width should be between 200 ns and 100 ms.
Pulses faster than the minimum TLO may be ignored and
filtered by the device. Pulses longer than the maximum TLO
may shutdown the device. By pulsing the EN/DIM signal at
high frequency, the LED current can quickly be set to zero.
The LED driver enters a “zero current” shutdown mode if
EN/DIM is held low for 3 ms typical.
The dimming level is set by the number of pulses on the
EN/DIM after the powerup, as shown in Table 7.
Table 7. DIMMING LEVELS
Full Scale (Current in %) Dimming Pulses [n]
100 0
97 1
94 2
90 3
87 4
84 5
81 6
77 7
74 8
71 9
68 10
65 11
61 12
58 13
55 14
52 15
48 16
45 17
42 18
39 19
35 20
32 21
29 22
26 23
23 24
19 25
16 26
13 27
10 28
6 29
3 30
0 31
100 32
Figure 16. EN/DIM Digital Dimming Timing Diagram
100%
EN/DIM
LED
Current Shutdown Shutdown
97% 94%
3% 0%
100%
32 Levels
TLED
TLO
THI
TPWRDWN
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CAT4002A, CAT4004A
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8
PACKAGE DIMENSIONS
UDFN8, 2x2
CASE 517AW01
ISSUE O
E2
D2
L
E
PIN #1 INDEX AREA
PIN #1
IDENTIFICATION
DETAIL A
D
A1
b
e
A
TOP VIEW SIDE VIEW
DETAIL A
BOTTOM VIEW
Notes:
(1) All dimensions are in millimeters.
(2) Complies with JEDEC MO-229.
SYMBOL MIN NOM MAX
A 0.45 0.50 0.55
A1 0.00 0.02 0.05
b 0.18 0.25 0.30
D 1.90 2.00 2.10
D2 1.50 1.60 1.70
E 2.00
E2 0.80 0.90 1.00
e
1.90
0.50 BSC
2.10
L 0.20 0.30 0.45
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PACKAGE DIMENSIONS
SC70, 6 Lead, 1.25x2
CASE 419AD01
ISSUE O
E1
D
A
L
L1 L2
ee
bA1
A2
c
TOP VIEW
SIDE VIEW END VIEW
q1
q1
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MO-203.
E
q
SYMBOL MIN NOM MAX
θ
A
A1
b
c
D
E
E1
e
L
0º 8º
L2
0.00
0.15
0.10
0.26
1.80
1.80
1.15
0.65 BSC
0.15 BSC
1.10
0.10
0.30
0.18
0.46
2.20
2.40
1.35
L1
0.80
θ1 4º 10º
A2 0.80 1.00
0.42 REF
0.36
2.00
2.10
1.25
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10
PACKAGE DIMENSIONS
TSOT23, 6 LEAD
CASE 419AF01
ISSUE O
E1 E
A2
A1
e
b
D
c
A
TOP VIEW
SIDE VIEW END VIEW
L1
LL2
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MO-193.
SYMBOL
θ
MIN NOM MAX
q
A
A1
A2
b
c
D
E
E1
e
L
0º 8º
L1
L2
0.01
0.80
0.30
0.12
0.30
0.05
0.87
0.15
2.90 BSC
2.80 BSC
1.60 BSC
0.95 TYP
0.40
0.60 REF
0.25 BSC
1.00
0.10
0.90
0.45
0.20
0.50
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Example of Ordering Information (Note 4)
Prefix Device # Suffix
Company ID
CAT 4004A HU2
Product Number
4002A
GT3
Package
HU2: UDFN
TD: TSOT
SD: SC70
G: NiPdAu T: Tape & Reel
3: 3,000 Units / Reel
Tape & Reel (Note 6)
(Optional)
Lead Finish
4004A
Table 8. ORDERING INFORMATION
Part Number Package Quantity per Reel
CAT4002ASDGT3 SC706 3,000
CAT4002ATDGT3 TSOT23 3,000
CAT4004AHU2GT3 UDFN8 (2 x 2 mm) 3,000
2. All packages are RoHScompliant (Leadfree, Halogenfree).
3. The standard lead finish is NiPdAu.
4. The device used in the above example is a CAT4004AHU2GT3 (UDFN, NiPdAu, Tape & Reel, 3,000/Reel).
5. For additional package and temperature options, please contact your nearest ON Semiconductor Sales office.
6. 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.
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
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should
Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,
and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal
Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
CAT4002A/D
PUBLICATION ORDERING INFORMATION
N. American Technical Support: 8002829855 Toll Free
USA/Canada
Europe, Middle East and Africa Technical Support:
Phone: 421 33 790 2910
Japan Customer Focus Center
Phone: 81357733850
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Phone: 3036752175 or 8003443860 Toll Free USA/Canada
Fax: 3036752176 or 8003443867 Toll Free USA/Canada
Email: orderlit@onsemi.com
ON Semiconductor Website: www.onsemi.com
Order Literature: http://www.onsemi.com/orderlit
For additional information, please contact your local
Sales Representative

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