CAT3603HV2-T2 [ONSEMI]
LED Driver, Charge Pump, 3-Ch;
| 型号： | CAT3603HV2-T2 |
| 厂家： | 
ONSEMI |
| 描述： | LED Driver, Charge Pump, 3-Ch 驱动 接口集成电路 |
| 文件： | 总12页 (文件大小：226K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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.
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TDFN−12
HV2 SUFFIX
CASE 511AN
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.
PIN CONNECTIONS
1
LED1
LED2
LED3
RSET
EN
GND
C2+
C2−
C1−
C1+
VIN
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
VOUT
• 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
(Top View)
MARKING DIAGRAM
HABB
• Fixed High Frequency Operation 1 MHz
• “Zero” Current Shutdown Mode
• Soft Start and Current Limiting
• Short Circuit Protection
HABB = CAT3603 Device Code
ORDERING INFORMATION
• 12−lead TDFN 3 mm x 3 mm Package
• This Device is Pb−Free, Halogen Free/BFR Free and RoHS
Compliant
Device
CAT3603HV2
Package
Shipping
TDFN−12
(Pb−Free)
Green*
2,000/Tape & Reel
Applications
* Lead Finish Matte−Tin
• LCD Display Backlight
• Cellular Phones
• Digital Still Cameras
• Handheld Devices
© Semiconductor Components Industries, LLC, 2010
1
Publication Order Number:
January, 2010 − Rev. 5
CAT3603/D
CAT3603
1 mF
1 mF
C1+ C1− C2+ C2−
VIN
VOUT
VOUT
V
IN
CIN
COUT
3 V
to
5.5 V
CAT3603
1 mF
1 mF
OFF
EN
LED1
LED2
LED3
ON
20 mA
RSET
GND
23.7 kW
Note: Unused LED channels must be connected to VOUT.
Figure 1. Typical Application Circuit
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameter
Rating
Unit
V
VIN, VOUT, LEDx voltage
EN voltage
−0.3 to 7.0
−0.3 to VIN
−0.3 to VIN
−40 to +150
−65 to +160
300
V
RSET voltage
V
Junction Temperature Range
Storage Temperature Range
Lead Temperature
_C
_C
_C
V
ESD Rating HBM (Human Body Model)
ESD Rating MM (Machine Model)
2,000
200
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
Range
3 to 5.5
Unit
V
VIN
Ambient Temperature Range
Input, Output, Bucket Capacitors
−40 to +85
20% typical
0 to 30
_C
mF
1
I
per LED pin
mA
LED
1. Typical application circuit with external components is shown above.
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2
CAT3603
Table 3. ELECTRICAL OPERATING CHARACTERISTICS
(VIN = 3.6 V, EN = High, T
= 25°C over recommended operating conditions unless otherwise stated.)
AMB
Symbol
Parameter
Conditions
Min
Typ
Max
Units
I
Q
Quiescent Current
V
= 0 V, shutdown mode
0.1
0.4
2.7
1
1
5
mA
mA
mA
EN
1x Mode, No Load
1.5x Mode, No Load
V
RSET Regulated Voltage
Programmed LED Current
1.17
1.2
1.23
V
RSET
I
I
I
I
= 5 mA
= 37 mA
= 78 mA
2.4
15.0
30.0
mA
LED
RSET
RSET
RSET
I
LED Current Accuracy
LED Channel Matching
0.5 mA ≤ I
≤ 3 mA
≤ 30 mA
15
5
%
LED−ACC
LED
3 mA ≤ I
LED
I
(I
LED
– I
LEDAVG
) / I
LEDAVG
3
%
LED−DEV
R
Output Resistance
(Open Loop)
1x Mode
1.5x Mode, I
1.4
6.5
2.5
10
W
OUT
= 100 mA
OUT
f
Charge Pump Frequency
0.8
0.4
1.0
0.6
1.3
0.9
MHz
ms
OSC
T
1x to 1.5x Mode Transition
Dropout Delay
DROPOUT
I
Input Leakage Current
On Input EN
On Input EN
1
mA
EN
V
High Detect Threshold
Low Detect Threshold
0.8
0.7
1.3
V
EN
0.4
30
I
Short Circuit Output Current
Maximum Input Current
VOUT = GND
VOUT > 1 V
45
400
150
20
60
mA
mA
°C
°C
V
SC
I
200
600
LIM
T
Thermal Shutdown
SD
T
HYS
Thermal Hysteresis
V
Undervoltage lock out (UVLO) threshold
2
UVLO
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3
CAT3603
TYPICAL CHARACTERISTICS
(VIN = 3.6 V, I
= 60 mA (3 LEDs at 20 mA), C = C = C = C
= 1 mF, T
= 25°C unless otherwise specified.)
OUT
1
2
IN
OUT
AMB
100
90
100
1x Mode
1.5x Mode
90
80
70
60
VIN = 4 V (1x Mode)
80
70
60
20 mA per LED
VIN = 3.2 V (1.5x Mode)
15 mA per LED
50
40
50
40
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)
Figure 3. Efficiency vs. Total LED Current
(3 LEDs)
0.8
0.6
0.8
0.6
0.4
0.4
0.2
0
0.2
0
LEDs Off
LEDs Off
3.0
3.2
3.4
3.6
3.8
4.0
4.2
−40
0
40
80
120
INPUT VOLTAGE (V)
TEMPERATURE (°C)
Figure 4. Quiescent Current vs. Input Voltage
(1x Mode)
Figure 5. Quiescent Current vs. Temperature
(1x Mode)
6.0
5.0
4.0
3.0
2.0
6.0
5.0
4.0
3.0
2.0
1.0
0
1.0
0
LEDs Off
LEDs Off
3.0
3.2
3.4
3.6
3.8
4.0
4.2
−40
0
40
80
120
INPUT VOLTAGE (V)
TEMPERATURE (°C)
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
= 60 mA (3 LEDs at 20 mA), C = C = C = C
= 1 mF, T = 25°C unless otherwise specified.)
OUT
1
2
IN
OUT
AMB
5.0
4.0
5.0
4.0
3.0
3.0
2.0
2.0
1.0
1.0
1x Mode
0
0
1.5x Mode
−1.0
−2.0
−1.0
−2.0
−3.0
−3.0
−4.0
−5.0
VIN = 4 V
−4.0
−5.0
3.0
3.2
3.4
3.6
3.8
4.0
4.2
−40
0
40
80
120
120
4.2
INPUT VOLTAGE (V)
TEMPERATURE (°C)
Figure 8. LED Current Change vs. Input
Voltage
Figure 9. LED Current Change vs.
Temperature
1.3
1.2
1.3
1.2
1.1
1.1
1.0
0.9
1.0
0.9
0.8
0.7
0.8
0.7
3.0
3.2
3.4
3.6
3.8
4.0
4.2
−40
0
40
80
INPUT VOLTAGE (V)
TEMPERATURE (°C)
Figure 10. Switching Frequency vs. Input
Voltage
Figure 11. Switching Frequency vs.
Temperature
4
3
10
8
6
2
4
2
1
0
3.0
3.2
3.4
3.6
3.8
4.0
4.2
3.0
3.2
3.4
3.6
3.8
4.0
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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CAT3603
TYPICAL CHARACTERISTICS
(VIN = 3.6 V, I
= 60 mA (3 LEDs at 20 mA), C = C = C = C
= 1 mF, T = 25°C unless otherwise specified.)
OUT
1
2
IN
OUT
AMB
VIN
50mV/div
VIN
50mV/div
AC Coupled
AC Coupled
AC Coupled
AC Coupled
Input
Current
10mA/div
Input
Current
10mA/div
VOUT
50mV/div
VOUT
50mV/div
AC Coupled
AC Coupled
500ns/div
500ns/div
Figure 14. Switching Waveforms in 1.5x Mode
Figure 15. Operating Waveforms in 1x Mode
EN
2V/div
EN
2V/div
Input
Current
100mA/
div
Input
Current
100mA/
div
VOUT
5V/div
VOUT
5V/div
500ms/div
500ms/div
Figure 16. Power Up 3 LEDs at 20 mA,
VIN = 3.2 V (1.5x Mode)
Figure 17. Power Up 3 LEDs at 20 mA,
VIN = 4 V (1x Mode)
100
VIN
2V/div
LED
Current
5mA/div
10
VOUT
5V/div
1
10
100
RSET (kW)
1,000
200ms/div
Figure 18. LED Current vs. RSET
Figure 19. Line Transient Response
in 1x Mode
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CAT3603
TYPICAL CHARACTERISTICS
(VIN = 3.6 V, I
= 60 mA (3 LEDs at 20 mA), C = C = C = C
= 1 mF, T = 25°C unless otherwise specified.)
OUT
1
2
IN
OUT
AMB
5
4
3
1x Mode
2
1
0
0
100
200
300
400
500
OUTPUT CURRENT (mA)
Figure 20. Foldback Current Limit
Table 4. PIN DESCRIPTION
Pin #
1
Name
LED1
LED2
LED3
RSET
EN
Function
LED1 cathode terminal (if not used, connect to VOUT) (Note 2)
LED2 cathode terminal (if not used, connect to VOUT) (Note 2)
LED3 cathode terminal (if not used, connect to VOUT) (Note 2)
The LED output current is set by the current sourced out of the RSET pin
Device enable (active high)
2
3
4
5
6
VOUT
VIN
Charge pump output connected to the LED anodes
Supply voltage
7
8
C1+
Bucket capacitor 1 terminal
9
C1−
Bucket capacitor 1 terminal
10
11
12
C2−
Bucket capacitor 2 terminal
C2+
Bucket capacitor 2 terminal
GND
TAB
Ground Reference
Connect to GND on the PCB
2. LED1, LED2, LED3 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 3.0 V to 5.5 V.
C1+, C1− are connected to each side of the 1 mF ceramic
bucket capacitor C1.
C2+, C2− are connected to each side of the 1 mF ceramic
bucket capacitor C2.
EN is the enable 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.
LED1 to LED3 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 three
LEDs, all unused channels should be wired directly to
VOUT. This ensures the channel is automatically disabled
dissipating less than 200 mA.
RSET pin is regulated at 1.2 V. An external resistor RSET
connected from the RSET pin to GND sets the LED current.
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.
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.
GND is the ground reference for the charge pump. The pin
must be connected to the ground plane on the PCB.
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7
CAT3603
Block Diagram
Figure 21. CAT3603 Functional Block Diagram
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8
CAT3603
Basic Operation
External Components
At power−up, the CAT3603 starts operating in 1x mode
where the output will be approximately equal to the input
supply voltage (minus 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 falls to a level where the regulated
currents cannot be maintained, the device automatically
switches into 1.5x mode.
In 1.5x mode, the output is approximately equal to 1.5
times the input supply voltage (minus any internal voltage
losses), and high enough to achieve the nominal LED
current.
The above sequence is reinitialized every time the chip is
powered−up or is taken out of shutdown mode (via EN pin).
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
via. A copper area matching the TDFN exposed pad (GND)
must be connected to the ground plane underneath. The use
of multiple via improves the package heat dissipation.
LED Current Setting
The LED current is set by the external resistor R
connected between the RSET pin and ground. Table 5 lists
various LED currents and the associated R resistor value
for standard 1% precision surface mount resistors.
SET
SET
Table 5. RSET Resistor Selection
LED Current [mA]
R
[kW]
SET
1
2
649
287
102
5
10
15
20
30
49.9
32.4
23.7
15.4
The unused LED channels must be disabled by connecting
the respective LED pins to VOUT. A disabled channel sinks
only 0.2 mA typical. When the following equation is true on
any channel, the driver turns off the LED channel:
Figure 22. Recommended Layout
VOUT * VLED v 1 V (LED channel OFF)
Note: The CAT3603 is designed to drive LEDs with forward
voltage greater than 1 V and is not compatible with resistive
loads less than 5 kW.
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CAT3603
Example of Ordering Information (Notes 3, 4)
Prefix
Device #
Suffix
CAT
3603
HV2
− T2
Company ID
(Optional)
Product Number
Package
Tape & Reel (Note 7)
T: Tape & Reel
3603
HV2: TDFN (Lead−free, Halogen−free)
2: 2,000 / Reel
3. The device used in the above example is a CAT3603HV2−T2 (TDFN, Tape & Reel, 2,000/Reel).
4. All packages are RoHS−compliant (Lead−free, Halogen−free).
5. The standard lead finish is Matte−Tin.
6. For additional package and temperature options, please contact your nearest ON Semiconductor Sales office.
7. 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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MECHANICAL CASE OUTLINE
PACKAGE DIMENSIONS
TDFN12, 3x3
CASE 511AN−01
ISSUE A
DATE 18 MAR 2009
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
Electronic versions are uncontrolled except when accessed directly from the Document Repository.
Printed versions are uncontrolled except when stamped “CONTROLLED COPY” in red.
DOCUMENT NUMBER:
DESCRIPTION:
98AON34357E
TDFN12, 3X3
PAGE 1 OF 1
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