CAT4003BSD-GT3 [ONSEMI]
Constant Current Programmable LED Driver with 32 Dimming Levels; 恒流可编程LED驱动器， 32调光等级
| 型号： | CAT4003BSD-GT3 |
| 厂家： | 
ONSEMI |
| 描述： | Constant Current Programmable LED Driver with 32 Dimming Levels |
| 文件： | 总11页 (文件大小：173K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
CAT4002B, CAT4003B,
CAT4004B
Constant Current
Programmable LED Driver
with 32 Dimming Levels
Description
http://onsemi.com
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.
UDFN−8
HU2 SUFFIX
CASE 517AW
TSOT23−6
TD SUFFIX
CASE 419AF
SC70−6
SD SUFFIX
CASE 419AD
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 including 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.
TYPICAL APPLICATION CIRCUIT
Features
VIN
C
• 2, 3, 4 LED Current Sinks with Tight Matching
• 32 Dimming Levels
• Low Dropout Driver 75 mV at 20 mA
• No Switching Noise
IN
2.4 V
to
5.5 V
1 mF
LED1
LED2
VIN
• Shutdown Current less than 1 mA
• 25 mA Max LED Current per Channel
• Dimming via 1−wire EZDimt Interface
• Thermal Shutdown Protection
CAT4002B
One Wire
Programming
32 Steps
EN/DIM
• RoHS Compliant
GND
• 6−lead TSOT−23, SC−70, and 8−pad UDFN 2 mm x 2 mm Packages
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, 2010
1
Publication Order Number:
January, 2010 − Rev. 2
CAT4002B/D
CAT4002B, CAT4003B, CAT4004B
MARKING DIAGRAMS
BHA
XXX
YM
VKYM
VHA
UDFN8 (2 x 2 mm)
TSOT23−6L
SC70−6L
BH = CAT4004B Device Code
A
= Assembly Location Code
XXX = Last Three Digits of Assembly Lot Number
KLYM
KLA
Y
= Production Year (last digit)
M
= Production Month: 1 − 9, A, B, C
TSOT23−6L
SC70−6L
VK = CAT4002B Device Code
KL = CAT4003B Device Code
VH = CAT4002B Device Code
KL = CAT4003B Device Code
Y
= Production Year (last digit)
A
= Assembly Location Code
M
= Production Month: 1 − 9, A, B, C
ORDERING INFORMATION (Note 1)
Orderable Part Number
Package
Finish
Shipping (Note 2)
3,000 / Tape & Reel
3,000 / Tape & Reel
3,000 / Tape & Reel
3,000 / Tape & Reel
3,000 / Tape & Reel
CAT4002BTD−GT3
CAT4002BSD−GT3
CAT4003BTD−GT3
CAT4003BSD−GT3
CAT4004BHU2−GT3
TSOT−23, 6−Lead
SC−70, 6−Lead
TSOT−23, 6−Lead
SC−70, 6−Lead
NiPdAu (RoHS Compliant)
NiPdAu (RoHS Compliant)
NiPdAu (RoHS Compliant)
NiPdAu (RoHS Compliant)
UDFN, 8−Pad, 2 x 2 mm
NiPdAu (RoHS Compliant)
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
1
1
LED1
LED2
LED3
EN/DIM
GND
LED2
LED3
VIN
VIN
LED1
GND
EN/DIM
GND
NC
LED1
LED2
LED4
LED3
EN/DIM
VIN
CAT4004B
UDFN8 2 x 2 mm
CAT4003B
SC70−6L
CAT4003B
TSOT23−6L
1
1
LED1
NC
EN/DIM
GND
LED2
NC
LED1
GND
VIN
EN/DIM
LED2
VIN
CAT4002B
SC70−6L
CAT4002B
TSOT23−6L
Table 1. PIN FUNCTIONS
Pin Name
EN/DIM
GND
Function
Device Enable (active high) and Dimming Control
Ground Reference
LED1
LED1 Cathode Terminal
LED2
LED2 Cathode Terminal
LED3
LED3 Cathode Terminal
LED4
LED4 Cathode Terminal
VIN
Device Supply Input, Connect to Battery or Supply
Connect to GND on the PCB
TAB
Table 2. ABSOLUTE MAXIMUM RATINGS
Parameter
Value
Unit
V
VIN, LEDx Voltage
6
EN/DIM Voltage
VIN + 0.7
−65 to +160
−40 to +125
300
V
Storage Temperature Range
Junction Temperature Range
Lead Temperature
°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
Value
2.4 to 5.5
−40 to +85
0 to 25
Unit
V
VIN
Ambient Temperature Range
LED Current Range
°C
mA
3. Typical application circuit with external components is shown on page 1.
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3
CAT4002B, CAT4003B, CAT4004B
Table 4. ELECTRICAL OPERATING CHARACTERISTICS
(over recommended operating conditions unless specified otherwise) (V = 4.0 V, EN = High, T
= 25°C)
Min
IN
AMB
Parameter
Quiescent Current
Conditions
Symbol
Typ
Max
1.5
1
Units
mA
mA
I
= 25 mA/channel
I
Q
0.5
0.7
LED
Shutdown Current
V
EN
= 0 V
I
QSHDN
Full Scale LED Current (Average) (Note 4)
LED Channel Matching
I
24
25
1
26
mA
%
LED−FULL
I
−5
+5
LED−DEV
I
LED * ILEDAVG
ILEDAVG
Dropout Voltage
I
I
= 20 mA
= 1 mA
V
DOUT
75
45
mV
LED
LED
EN/DIM Pin
− Internal pull−down resistor
− Logic High Level
− Logic Low Level
R
100
kW
V
V
EN/DIM
V
HI
1.3
V
LO
0.4
Thermal Shutdown
T
150
20
°C
°C
V
SD
Thermal Hysteresis
T
HYS
Undervoltage lockout (UVLO) threshold
V
UVLO
2.0
4. For the CAT4004B, I
For the CAT4003B, I
For the CAT4002B, I
= (I
= (I
= (I
+ I
LED,CH2
+ I
LED,CH2
+ I
LED,CH2
+ I
+ I
+ I
) / 4
LEDAVG
LEDAVG
LEDAVG
LED,CH1
LED,CH1
LED,CH1
LED,CH3
LED,CH3
LED,CH4
) / 3
) / 2
5. The standard lead finish is NiPdAu.
Table 5. RECOMMENDED EN/DIM TIMING (For 2.4 V ≤ V ≤ 5.5 V, over full ambient temperature range −40°C to +85°C.)
IN
Parameter
EN/DIM program low time
Conditions
Symbol
Min
0.2
0.2
Typ
Max
Units
ms
T
LO
100
EN/DIM program high time
LED current settling time
EN/DIM low time to shutdown
T
HI
ms
T
10
3
ms
LED
PWRDWN
T
2
5
ms
T
HI
EN/DIM
T
LO
T
PWRDWN
T
LED
100%
100%
97%
94%
LED
Current
32 Levels
Shutdown
3%
Shutdown
0%
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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4
CAT4002B, CAT4003B, CAT4004B
TYPICAL CHARACTERISTICS
(CAT4003B, V = 4 V, V = 3.3 V, I
= 75 mA (3 LEDs at 25 mA), C = 1 μF, T
= 25°C unless otherwise specified.)
IN
F
OUT
IN
AMB
1.4
1.2
1.0
0.8
1.4
−40°C
25°C
1.2
1.0
0.8
0.6
0.6
0.4
80°C
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE [V]
2.0 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
10
8
0.8
0.6
6
0.4
4
0.2
2
0.0
0
−0.2
−2
−4
−6
−0.4
−0.6
−0.8
−8
−1.0
−10
2.5 3.0 3.5 4.0 4.5 5.0 5.5
−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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5
CAT4002B, CAT4003B, CAT4004B
TYPICAL CHARACTERISTICS
(CAT4003B, V = 4 V, V = 3.3 V, I
= 75 mA (3 LEDs at 25 mA), C = 1 μF, T
= 25°C unless otherwise specified.)
IN
F
OUT
IN
AMB
30
25
20
15
100
25mA
90
80
70
10
5
60
50
0.8mA
0
0
50
100 150 200 250 300
3.0
3.5
4.0
4.5
5.0
LED PIN VOLTAGE [mV]
INPUT VOLTAGE [V]
Figure 6. Dropout Characteristics
Figure 7. Efficiency vs. Input Voltage
Figure 8. Power Up Waveform
Figure 9. Power Down Waveform
Figure 10. Line Transient Waveform
Figure 11. Dimming Levels
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6
CAT4002B, CAT4003B, CAT4004B
Pin Functions
into “zero current” shutdown mode, the EN/DIM pin must
be held low for 3 ms typical
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 2.4 V to 5.5 V. Whenever the input supply falls
below the under−voltage threshold (2.0 V), all the LED
channels are disabled and the device enters shutdown mode.
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.
GND is the ground reference for the device. The pin must be
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 CAT400XB becomes enabled and all LED
currents are set to the full scale 25 mA. To place the device
connected to the ground plane on the PCB.
TAB (CAT4004B 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.
V
IN
Undervoltage
Lockout
VIN
Reference
Voltage
Current
Setting DAC
4 Current Sink
Regulators
Serial
Interface
Register
EN/DIM
100 kΩ
GND
Figure 12. CAT4004B Functional Block Diagram
Basic Operation
The CAT400XB uses tightly matched current sinks to
accurately regulate LED current in each channel.
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 13. 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
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 75 mV headroom
to sink a constant regulated current of 20 mA. If the input
supply falls below 2.0 V, the under−voltage lockout circuit
disables all LED channels and resets the circuit to default
values. Any unused LED channels should be left open.
st
current is 3.2% of the full scale current. On the 31 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.
CAT400XB LED Current Selection
After power−up and once enabled, the LED current is set
initially to the full scale currrent of 25 mA. The number of
pulses (n) on the EN/DIM input does decrease the current
value as follows:
The dimming level is set by the number of pulses on the
EN/DIM after the power−up, as shown in Table 6.
31 * n
31
ǒ
Ǔ
LED current [mA] + 25
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7
CAT4002B, CAT4003B, CAT4004B
Full Scale Current in %
Dimming Pulses [n]
Table 6. DIMMING LEVELS
Full Scale Current in %
Dimming Pulses [n]
48
45
42
39
35
32
29
26
23
19
16
13
10
6
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
100
97
94
90
87
84
81
77
74
71
68
65
61
58
55
52
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
3
0
100
T
HI
EN/DIM
T
LO
T
PWRDWN
T
LED
100%
100%
97%
94%
LED
Current
32 Levels
3%
Shutdown
Shutdown
0%
Figure 13. EN/DIM Digital Dimming Timing Diagram
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8
CAT4002B, CAT4003B, CAT4004B
PACKAGE DIMENSIONS
UDFN8, 2x2
CASE 517AW−01
ISSUE O
D
A
D2
DETAIL A
E
E2
PIN #1
IDENTIFICATION
A1
PIN #1 INDEX AREA
TOP VIEW
SIDE VIEW
BOTTOM VIEW
SYMBOL
MIN
NOM
MAX
A
A1
b
0.45
0.00
0.18
1.90
1.50
1.90
0.80
0.50
0.02
0.55
0.05
0.30
2.10
1.70
2.10
1.00
b
0.25
D
2.00
L
D2
E
1.60
2.00
e
E2
e
0.90
0.50 BSC
0.30
DETAIL A
L
0.20
0.45
Notes:
(1) All dimensions are in millimeters.
(2) Complies with JEDEC MO-229.
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9
CAT4002B, CAT4003B, CAT4004B
PACKAGE DIMENSIONS
SC−70, 6 Lead, 1.25x2
CASE 419AD−01
ISSUE O
SYMBOL
MIN
NOM
MAX
D
0.80
A
1.10
e
e
A1
A2
0.00
0.80
0.10
1.00
b
c
0.15
0.10
1.80
1.80
1.15
0.30
0.18
2.20
2.40
1.35
D
2.00
2.10
E1
E
E
E1
e
1.25
0.65 BSC
0.36
L
0.26
0.46
L1
L2
0.42 REF
0.15 BSC
TOP VIEW
0º
4º
8º
θ
10º
θ1
q1
A2
A1
A
q
L
b
L1
q1
c
L2
SIDE VIEW
END VIEW
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MO-203.
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10
CAT4002B, CAT4003B, CAT4004B
PACKAGE DIMENSIONS
TSOT−23, 6 LEAD
CASE 419AF−01
ISSUE O
SYMBOL
MIN
NOM
MAX
1.00
0.10
0.90
0.45
0.20
D
A
A1
A2
b
e
0.01
0.80
0.30
0.12
0.05
0.87
c
0.15
D
2.90 BSC
2.80 BSC
1.60 BSC
0.95 TYP
0.40
E1
E
E
E1
e
L
0.30
0.50
L1
L2
θ
0.60 REF
0.25 BSC
0º
8º
TOP VIEW
A2 A
q
L
b
c
A1
L2
L1
SIDE VIEW
END VIEW
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MO-193.
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
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PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT:
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USA/Canada
Europe, Middle East and Africa Technical Support:
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Phone: 81−3−5773−3850
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Order Literature: http://www.onsemi.com/orderlit
Literature Distribution Center for ON Semiconductor
P.O. Box 5163, Denver, Colorado 80217 USA
Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada
Fax: 303−675−2176 or 800−344−3867 Toll Free USA/Canada
Email: orderlit@onsemi.com
For additional information, please contact your local
Sales Representative
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