CAT3614HV2-T2 [ONSEMI]
4-Channel 1-Wire LED Driver in 3 x 3 mm Package; 4通道的1-Wire LED驱动器的3 ×3毫米包装
| 型号： | CAT3614HV2-T2 |
| 厂家： | 
ONSEMI |
| 描述： | 4-Channel 1-Wire LED Driver in 3 x 3 mm Package |
| 文件： | 总12页 (文件大小：154K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
CAT3614
4-Channel 1-Wire LED
Driver in 3 x 3 mm Package
Description
The CAT3614 is a high efficiency 1x/1.5x fractional charge pump
with programmable dimming current in four LED channels. To ensure
uniform brightness in LCD backlight applications, each LED channel
delivers an accurate regulated current.
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Low noise and input ripple is achieved by operating at a constant
switching frequency of 1 MHz which allows the use of small external
ceramic capacitors. The 1x/1.5x fractional charge pump supports a
wide range of input voltages from 3 V to 5.5 V with efficiency up to
91%, and is ideal for Li−Ion battery powered devices.
TDFN−12
HV2 SUFFIX
CASE 511AN
The EN/DIM logic input provides a 1−wire EZDimt interface for
dimming control of the LEDs. When enabled, a series of clock pulses
reduces the LED brightness in 1 mA steps on each negative going
edge. Currents from 0 mA to 31 mA are supported.
The device is available in the tiny 12−pad TDFN 3 x 3 mm package
with a max height of 0.8 mm.
PIN CONNECTIONS
1
VIN
C1+
C1−
C2−
C2+
GND
VOUT
EN/DIM
LED4
LED3
LED2
LED1
Features
• Drives up to 4 LED Channels
• 1−wire EZDimt Programmable LED Current
• Accurate 1 mA Dimming Level
• Power Efficiency up to 91%
• Fractional Pump 1x/1.5x
(Top View)
MARKING DIAGRAM
• Low Noise Input Ripple
• Fixed High Frequency Operation 1 MHz
• “Zero” Current Shutdown Mode
• Soft Start and Current Limiting
• Short Circuit Protection
HAAA
AXXX
YWW
HAAC
AXXX
YWW
HAAA = CAT3614HV2-T2
HAAC = CAT3614HV2-GT2
A = Assembly Location
XXX = Last Three Digits of Assembly Lot Number
Y = Production Year (Last Digit)
• Thermal Shutdown Protection
• TDFN 12−pad 3 mm x 3 mm Package
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
WW = Production Week (Two Digit)
Applications
ORDERING INFORMATION
• LCD Display Backlight
• Cellular Phones
• Digital Still Cameras
• Handheld Devices
Device
Package
Shipping
CAT3614HV2−T2
TDFN−12
(Pb−Free)
2,000/
Tape & Reel
(Note 1)
CAT3614HV2−GT2 TDFN−12
(Note 2)
2,000/
Tape & Reel
(Pb−Free)
1. Matte−Tin Plated Finish (RoHS−compliant).
2. NiPdAu Plated Finish (RoHS−compliant).
©
Semiconductor Components Industries, LLC, 2010
1
Publication Order Number:
April, 2010 − Rev. 2
CAT3614/D
CAT3614
1 mF
1 mF
C1+ C1− C2+ C2−
V
IN
V
OUT
VIN
VOUT
C
C
OUT
IN
3 V to
5.5 V
CAT3614
1 mF
20 mA
1 mF
LED1
LED2
LED3
LED4
ENABLE/
DIMMING
EN/DIM
GND
Figure 1. Typical Application Circuit
NOTE: Unused LED channels must be connected to VOUT.
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameter
Rating
Unit
V
VIN, LEDx voltage
6
7
VOUT, C1 , C2 voltage
EN/DIM voltage
V
V
+ 0.7 V
V
IN
Storage Temperature Range
Junction Temperature Range
Lead Temperature
−65 to +160
−40 to +150
300
°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 2. RECOMMENDED OPERATING CONDITIONS
Parameter
Range
3 to 5.5
Unit
V
VIN
Ambient Temperature Range
−40 to +85
0 to 31
°C
I
per LED pin
mA
mA
LED
Total Output Current
0 to 124
NOTE: Typical application circuit with external components is shown above.
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CAT3614
Table 3. ELECTRICAL OPERATING CHARACTERISTICS
V
IN
= 3.6 V, EN = High, ambient temperature of 25°C (over recommended operating conditions unless specified otherwise).
Symbol
Parameter
Quiescent Current
Conditions
Min
Typ
Max
Unit
I
Q
1x mode, no load
1.5x mode, no load
0.3
1
0.5
3
1
8
mA
I
Shutdown Current
V
= 0 V
1
8
7
mA
%
%
W
QSHDN
EN
I
LED Current Accuracy
LED Channel Matching
Output Resistance (open loop)
1 mA ≤ I
≤ 31 mA
3
3
LED−ACC
LED
I
(I
LED
− I
) / I
LED−DEV
LEDAVG LEDAVG
R
OUT
1x mode, I
1.5x mode, I
= 100 mA
0.4
2.6
1
7
OUT
= 100 mA
OUT
F
Charge Pump Frequency
Output short circuit Current Limit
Input Current Limit
0.8
30
1
1.3
100
600
MHz
mA
OSC
I
V
< 0.5 V
60
SC_MAX
OUT
I
1x mode, V
> 1 V
200
300
mA
IN_MAX
OUT
EN/DIM Pin
I
− Input Leakage
− Logic High Level
− Logic Low Level
−1
1.3
1
mA
V
V
EN/DIM
V
HI
V
LO
0.4
175
30
T
Thermal Shutdown
145
10
165
20
2
°C
°C
V
SD
T
Thermal Hysteresis
HYS
V
Undervoltage lock out (UVLO) threshold
1.7
2.4
UVLO
Table 4. RECOMMENDED EN/DIM TIMING (For 3 V ≤ V ≤ 5.5 V, over full ambient temperature range −40 to +85°C.)
IN
Symbol
Parameter
EN/DIM setup from shutdown
EN/DIM program low time
EN/DIM program high time
EN/DIM low time to shutdown
LED current enable
Conditions
Min
10
Typ
Max
Unit
ms
T
SETP
T
0.3
0.3
1.5
200
ms
LO
T
ms
HI
T
OFF
ms
ms
T
40
D
T
LED current decrement
0.1
ms
DEC
T
T
HI
SETP
T
OFF
EN/DIM
T
T
LO
D
T
DEC
31 mA
31 mA
30 mA
29 mA
LED
Current
1 mA
0 mA
Shutdown
Shutdown
Figure 2. LED Dimming Timing Diagram
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CAT3614
TYPICAL CHARACTERISTICS
(V = 3.6 V, I
= 80 mA (4 LEDs at 20 mA), C = C = C = C
= 1 mF, T
= 25°C unless otherwise specified.)
IN
OUT
1
2
IN
OUT
AMB
100
90
100
20 mA per LED
1x mode
90
80
70
60
VIN = 4 V (1x Mode)
80
70
60
10 mA per LED
VIN = 3.2 V (1.5x Mode)
50
40
50
40
1.5x mode
3.4
4.2
4.0
3.8
3.6
3.2
3.0
4.2
4.2
0
25
50
75
100
125
INPUT VOLTAGE (V)
TOTAL LED CURRENT (mA)
Figure 3. Efficiency vs. Input Voltage (4 LEDs)
Figure 4. Efficiency vs. Total LED Current
(4 LEDs)
0.8
0.6
0.4
0.8
0.6
0.4
4 LEDs OFF
4 LEDs OFF
0.2
0
0.2
0
3.0
3.2
3.4
3.6
3.8
4.0
−40
0
40
80
120
INPUT VOLTAGE (V)
TEMPERATURE (°C)
Figure 5. Quiescent Current vs. Input Voltage
(1x Mode)
Figure 6. Quiescent Current vs. Temperature
(1x Mode)
6
5
4
3
2
6
5
4
3
2
4 LEDs OFF
4 LEDs OFF
1
0
1
0
3.0
3.2
3.4
3.6
3.8
4.0
−40
0
40
80
120
INPUT VOLTAGE (V)
TEMPERATURE (°C)
Figure 7. Quiescent Current vs. Input Voltage
(1.5x Mode)
Figure 8. Quiescent Current vs. Temperature
(1.5x Mode)
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CAT3614
TYPICAL CHARACTERISTICS
(V = 3.6 V, I
= 80 mA (4 LEDs at 20 mA), C = C = C = C
= 1 mF, T
= 25°C unless otherwise specified.)
IN
OUT
1
2
IN
OUT
AMB
5
4
3
2
1
0
5
4
3
2
1x Mode
1
0
−1
−1
−2
−3
1.5x Mode
−2
−3
−4
−5
−4
−5
3.0
3.0
3.0
3.2
3.4
3.6
3.8
4.0
4.2
4.0
4.2
−40
−20
0
20
40
60
80
120
4.2
INPUT VOLTAGE (V)
TEMPERATURE (°C)
Figure 9. LED Current Change vs. Input
Voltage
Figure 10. LED Current Change vs.
Temperature
1.3
1.2
1.1
1.0
0.9
1.3
1.2
1.1
1.0
0.9
4 LEDs at 20 mA
0.8
0.7
0.8
0.7
3.2
3.4
3.6
3.8
−40
0
40
80
INPUT VOLTAGE (V)
TEMPERATURE (°C)
Figure 11. Oscillator Frequency vs. Input
Voltage
Figure 12. Oscillator Frequency vs.
Temperature
1.0
0.8
0.6
4.0
3.5
3.0
2.5
2.0
0.4
0.2
0
1.5
1.0
3.2
3.4
3.6
3.8
4.0
3.0
3.2
3.4
3.6
3.8
4.0
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Figure 13. Output Resistance vs. Input Voltage
(1x Mode)
Figure 14. Output Resistance vs. Input Voltage
(1.5x Mode)
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CAT3614
TYPICAL CHARACTERISTICS
(V = 3.6 V, I
= 80 mA (4 LEDs at 20 mA), C = C = C = C
= 1 mF, T
= 25°C unless otherwise specified.)
IN
OUT
1
2
IN
OUT
AMB
Figure 15. Power Up with 4 LEDs at 15 mA
(1x Mode)
Figure 16. Power Up with 4 LEDs at 15 mA
(1.5x Mode)
Figure 17. Enable Power Down Delay
(1x Mode)
Figure 18. Enable Power Down Delay
(1.5x Mode)
Figure 19. Switching Waveforms in 1.5x Mode
Figure 20. Operating Waveforms in 1x Mode
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CAT3614
TYPICAL CHARACTERISTICS
(V = 3.6 V, I
= 80 mA (4 LEDs at 20 mA), C = C = C = C
= 1 mF, T
= 25°C unless otherwise specified.)
IN
OUT
1
2
IN
OUT
AMB
Figure 21. Enable and Output Current
Dimming Waveforms
Figure 22. Line Transient Response
(3.6 V to 5.5 V) 1x Mode
200
160
200
160
120
80
VIN = 3.5 V
VIN = 3.5 V
VIN = 4.2 V
120
80
VIN = 4.2 V
40
0
40
0
−40
0
40
80
120
−40
0
40
80
120
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 23. Enable High Minimum Program
Time vs. Temperature
Figure 24. Enable Low Minimum Program
Time vs. Temperature
1.2
1.0
0.8
0.6
0.4
4.0
3.5
3.0
2.5
1x Mode
VIN = 3.5 V
2.0
1.5
1.0
0.2
0
0.5
0
−40
0
40
80
120
0
100
200
300
400
TEMPERATURE (°C)
OUTPUT CURRENT (mA)
Figure 25. Enable Voltage Threshold vs.
Temperature
Figure 26. Foldback Current Limit
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CAT3614
Table 5. PIN DESCRIPTIONS
Pin #
1
Name
VIN
Function
Supply voltage.
2
C1+
Bucket capacitor 1 terminal
Bucket capacitor 1 terminal
Bucket capacitor 2 terminal
Bucket capacitor 2 terminal
Ground reference
3
C1−
4
C2−
5
C2+
6
GND
LED1
LED2
LED3
LED4
EN/DIM
VOUT
TAB
7
LED1 cathode terminal (if not used, connect to VOUT) (Note 3)
LED2 cathode terminal (if not used, connect to VOUT) (Note 3)
LED3 cathode terminal (if not used, connect to VOUT) (Note 3)
LED4 cathode terminal (if not used, connect to VOUT) (Note 3)
Device enable (active high) and dimming control input
Charge pump output connected to the LED anodes
Connect to GND on the PCB
8
9
10
11
12
TAB
3. LED1, LED2, LED3, LED4 pins should not be left floating. They should be connected to the LED cathode, or tied to VOUT pin if not used.
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 2.2 V to 5.5 V. Whenever the input supply falls
below the undervoltage threshold (2 V) all LEDs channels
will be automatically disabled.
VOUT is the charge pump output that is connected to the
LED anodes. A small 1 mF ceramic bypass capacitor is
required between the VOUT pin and ground near the device.
GND is the ground reference for the charge pump. The pin
must be connected to the ground plane on the PCB.
C1+, C1− are connected to each side of the 1 mF ceramic
EN/DIM is the enable and dimming control logic input for
all LED channels. Guaranteed 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 device becomes enabled and all
LED currents remain at 0 mA. The falling edge of the first
pulse applied to EN/DIM sets all LED currents to their full
scale of 31 mA.
On each consecutive falling edge of the pulse applied to
EN/DIM, the LED current is decreased by 1 mA step. On the
32nd pulse, the LED current is set to zero. The next pulse on
EN/DIM resets the current back to their full scale of 31 mA.
To place the device into zero current shutdown mode, the
EN/DIM pin must be held low for 1.5 ms or more.
bucket capacitor C1.
C2+, C2− are connected to each side of the 1 mF ceramic
bucket capacitor C2.
LED1 to LED4 provide the internal regulated current for
each of the LED cathodes. These pins enter a high
impedance zero current state whenever the device is placed
in shutdown mode. In applications using less than four
LEDs, all unused channels should be wired directly to
VOUT. This ensures the channel is automatically disabled
dissipating less than 200 mA.
TAB 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.
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CAT3614
Block Diagram
1 mF
1 mF
C
1−
C
1+
C
2−
C
2+
V
IN
V
OUT
1x mode (LDO)
1.5x Charge Pump
C
IN
1 mF
Mode Control
1 MHz
Oscillator
LED1
LED2
LED3
LED4
EN/DIM
Reference
Voltage
Current
Setting DAC
LED Channel
Current Regulators
Serial
Interface
Registers
GND
Figure 27. CAT3614 Functional Block Diagram
Basic Operation
At power−up, the CAT3614 starts operating in 1x mode
where the output will be approximately equal to the input
supply voltage (less any internal voltage losses). If the
output voltage is sufficient to regulate all LED currents the
device remains in 1x operating mode.
If the input voltage is insufficient or falls to a level where
the regulated currents cannot be maintained, the device
automatically switches (after a fixed delay of 400 ms) into
1.5x mode.
In 1.5x mode, the output is approximately equal to 1.5
times the input supply voltage (less any internal voltage
losses).
The above sequence is repeated each and every time the
chip is powered−up or is taken out of shutdown mode (via
EN/DIM pin).
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CAT3614
LED Current Setting
Figure 2 shows the timing diagram necessary at the
EN/DIM input for setting the LED currents.
temperature drops down by about 20°C, the device resumes
normal operation.
External Components
The EN/DIM set up time requires the signal to be held
high for 10 ms or longer to ensure the initialization of the
driver at power−up. Each subsequent pulse on the EN/DIM
(300 ns to 200 ms pulse duration) steps down the LED
current from full scale of 31 mA to zero with a 1 mA
resolution. Consecutive pulses should be separated by
300 ns or longer. Pulsing beyond the 0 mA level restores the
current level back to full scale and the cycle repeats. Pulsing
frequencies from 5 kHz up to 1 MHz can be supported
during dimming operations. When the EN/DIM is held low
for 1.5 ms or more, the CAT3614 enters the shutdown mode
and draws “zero” current.
The driver requires a total of four external 1 mF ceramic
capacitors: two for decoupling input and output, and two for
the charge pump. Both capacitor types X5R and X7R are
recommended for the LED driver application. In the 1.5x
charge pump mode, the input current ripple is kept very low
by design, and an input bypass capacitor of 1 mF is sufficient.
In 1x mode, the device operating in linear mode does not
introduce switching noise back onto the supply.
Recommended Layout
In 1.5x charge pump mode, the driver switches internally
at a high frequency of 1 MHz. It is recommended to
minimize trace length to all four capacitors. A ground plane
should cover the area under the driver IC as well as the
bypass capacitors. Short connection to ground on capacitors
Cin and Cout can be implemented with the use of multiple
vias. A copper area matching the TDFN exposed pad (GND)
must be connected to the ground plane underneath. The use
of multiple vias improves the package heat dissipation.
For applications with three LEDs or less, any unused LED
pins should be tied to VOUT, as shown on Figure 28.
Protection Mode
If an LED becomes open−circuit, the output voltage
VOUT is internally limited to about 5.5 V. This is to prevent
the output pin from exceeding its absolute maximum rating.
The driver enters a thermal shutdown mode as soon as the
die temperature exceeds about +165°C. When the device
1 mF
1 mF
1 mF
1 mF
C1+ C1− C2+ C2−
C1+ C1− C2+ C2−
V
V
IN
IN
Flash
LED
VIN
VOUT
VOUT
VIN
3 V to
5.5 V
C
3 V to
5.5 V
OUT
C
OUT
1 mF
CAT3614
CAT3614
C
1 mF
IN
1 mF
C
IN
1 mF
LED1
LED2
LED1
LED2
LED3
LED4
ENABLE/
DIMMING
EN/DIM
LED3
LED4
ENABLE/
DIMMING
EN/DIM
120 mA
GND
GND
Figure 28. Three LED Application
Figure 29. Single Flash LED Application
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CAT3614
PACKAGE DIMENSIONS
TDFN12, 3x3
CASE 511AN−01
ISSUE A
D
A
e
b
L
E
E2
PIN#1 ID
PIN#1 INDEX AREA
A1
D2
TOP VIEW
SIDE VIEW
BOTTOM VIEW
SYMBOL
MIN
NOM
MAX
A
A
A1
A3
b
0.70
0.00
0.178
0.18
2.90
2.30
2.90
1.55
0.75
0.02
0.80
0.05
0.228
0.30
3.10
2.50
3.10
1.75
A3
0.203
0.23
A1
FRONT VIEW
D
3.00
RECOMMENDED LAND PATTERN
D2
E
2.40
3.00
R
e
M
E2
e
1.70
0.45 BSC
0.40
N
L
0.30
0.25
0.60
2.70
0.50
0.35
0.80
3.10
M
N
0.30
0.70
P
3.00
P
E2
R
2.25 TYP
Notes:
(1) All dimensions are in millimeters.
(2) Complies with JEDEC MO-229.
D2
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CAT3614
Example of Ordering Information (Note 6)
Prefix
Device #
Suffix
CAT
3614
HV2
− G
T2
Company ID
(Optional)
Product Number
Package
HV2: TDFN 3 x 3 mm
Lead Finish
Blank: Matte−Tin (Note 7)
G: NiPdAu
Tape & Reel (Note 8)
T: Tape & Reel
2: 2,000 / Reel
3614
4. All packages are RoHS−compliant (Lead−free, Halogen−free).
5. The standard lead finish is NiPdAu.
6. The device used in the above example is a CAT3614HV2−GT2 (TDFN, NiPdAu Plated Finish, Tape & Reel, 2,000/Reel).
7. For additional package options, please contact your nearest ON Semiconductor Sales office.
8. 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.
EZDim is a trademark of Semiconductor Components Industries, LLC.
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.
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CAT3614/D
相关型号：
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