CAT3606
6-Channel Low Noise
Charge Pump White LED
Driver
Description
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TQFN−16
HV4 SUFFIX
CASE 510AE
LED2
LED3
LED4
PIN CONNECTIONS (Note 1)
LED5
The CAT3606 controls up to four LEDs for the main display and
two LEDs for the sub-display in cellular phones. The device is capable
of operating in either 1x (LDO) mode or 1.5x charge pump mode. All
LED pin currents are regulated and tightly matched to achieve
uniformity of brightness across the LCD backlight. An external
resistor (RSET) sets the nominal output current.
The device can deliver as much as 20 mA per channel during low
voltage operation (3 V), and 30 mA per channel during nominal
operation (3.3 V). A constant high-frequency switching scheme
(1 MHz) provides low noise and allows the use of very small value
ceramic capacitors.
A “zero” quiescent current mode can be achieved via the chip enable
pin EN. The Main and Sub LEDs each have their own dedicated
ON/OFF control pins ENM, ENS. Dimming can be achieved using
either a DC voltage to control the RSET pin current, or by applying a
PWM signal on the ENM and ENS pins.
The device is available in a 16−pad TQFN package with a max
height of 0.8 mm.
1
LED6
LED1
EN
C2+
GND
ENM
C2−
ENS
C1−
Applications
•
•
•
•
Cell Phone Main and Sub−display Backlight
Navigation
PDAs
Digital Cameras
© Semiconductor Components Industries, LLC, 2010
January, 2010 − Rev. 3
C1+
VIN
Drives up to 4 Main LEDs and 2 Sub LEDs
Separate Control for Main and Sub LEDs
Compatible with Supply Voltage of 3 V to 5.5 V
Power Efficiency up to 90%
Output Current up to 30 mA per LED
High−frequency Operation at 1 MHz
2 Modes of Operation 1x and 1.5x
White LED Detect Circuitry on All Channels
Shutdown Current less than 1 mA
Small Ceramic Capacitors
Soft Start and Current Limiting
Short Circuit Protection
16−pad TQFN Package, 0.8 mm Max Height
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
RSET
•
•
•
•
•
•
•
•
•
•
•
•
•
•
VOUT
Features
(4 x 4 mm) (Top View)
MARKING DIAGRAMS
G366
CDBB
G366 = CAT3606HV4−T2
CDBB = CAT3606HV4−GT2
ORDERING INFORMATION
Device
Package
CAT3606HV4−T2
TQFN−16
(Note 2)
CAT3606HV4−GT2
TQFN−16
(Note 3)
Shipping
2,000/
Tape & Reel
1. The “exposed pad” under the package must be
connected to the ground plane on the PCB.
2. Matte−Tin Plated Finish (RoHS−compliant).
3. NiPdAu Plated Finish (RoHS−compliant).
1
Publication Order Number:
CAT3606/D
CAT3606
1 mF
C1+
Li−Ion
Battery +
1 mF
C1− C2+ C2−
CIN
1 mF
−
Main Display
Sub Display
VOUT
VIN
COUT
CAT3606
EN
ENABLE
LED1−4
ENM
ENABLE
LED5−6
ENS
RSET
24 kW
1 mF
LED1
ON/OFF
LED2
LED3
20 mA
LED4
LED5
RSET
LED6
GND
Figure 1. Typical Application Circuit
Table 1. PIN DESCRIPTION
Pin #
Name
Function
1
LED6
2
EN
3
ENM
Enable “main” input for LED1 to LED4, active low
4
ENS
Enable “sub” input for LED5 and LED6, active low
5
RSET
The LED output current is set by the current sourced out of the RSET pin
6
VOUT
Charge pump output connected to the LED anodes
7
VIN
Supply voltage
8
C1+
Bucket capacitor 1 terminal
9
C1
Bucket capacitor 1 terminal
10
C2
Bucket capacitor 2 terminal
Bucket capacitor 2 terminal
LED6 cathode terminal
Enable/shutdown input, active high
11
C2+
12
LED1
LED 1 cathode terminal
13
LED2
LED 2 cathode terminal
14
LED3
LED 3 cathode terminal
15
LED4
LED 4 cathode terminal
16
LED5
LED 5 cathode terminal
PAD
GND
Ground reference
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2
CAT3606
Table 2. ABSOLUTE MAXIMUM RATINGS
Parameter
Rating
Unit
VIN, VOUT, LEDx voltage
−0.3 to 7.0
V
EN, ENM, ENS voltage
−0.3 to VIN
V
RSET voltage
−0.3 to VIN
V
RSET current
±1
mA
Ambient Temperature Range
−40 to +85
_C
Storage Temperature Range
−65 to +160
_C
300
_C
2,000
V
200
V
Lead Temperature
ESD Rating HBM (Human Body Model)
ESD Rating MM (Machine Model) (Note 4)
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.
4. Machine model is with 200 pF capacitor discharged directly into each pin.
Table 3. RECOMMENDED OPERATING CONDITIONS
Parameter
VIN
Ambient Temperature Range
Range
Unit
3.0 to 5.5
V
−40 to +85
_C
1 ±20% Typical
mF
ILED per LED pin
0 to 30
mA
IOUT Total Output Current
0 to 150
mA
Input/Output/Bucket Capacitors
Table 4. ELECTRICAL OPERATING CHARACTERISTICS
(Limits over recommended operating conditions unless specified otherwise. Typical values at TA = 25°C, VIN = 3.5 V, IRSET = 5 mA.)
Symbol
IQ
Parameter
Conditions
Quiescent Current
Min
VEN = 0 V
1x Mode, No Load
1.5x Mode, No Load
Max
Unit
0.1
0.3
2.6
1
1
5
mA
mA
mA
1.2
1.23
V
VRSET
RSET Regulated Voltage
ILED
Programmed LED Current
IRSET = 5 mA
IRSET = 37 mA
IRSET = 78 mA
ILED
LED Current Range with 6 LEDs
3.3 ≤ VIN ≤ 4.5 V
3.0 ≤ VIN ≤ 4.5 V
30
20
mA
ILED
LED Current Range with 4 LEDs
3.3 ≤ VIN ≤ 4.5 V
30
mA
ILED−ACC
LED Current Accuracy
0.5 mA ≤ ILED ≤ 3 mA
3 mA ≤ ILED ≤ 30 mA
±15
±5
%
ILED−DEV
LED Channel Matching
(ILED – ILEDAVG) / ILEDAVG
±3
%
ROUT
Output Resistance
(Open Loop)
1x Mode,
1.5x Mode, IOUT = 100 mA
1.4
6.5
2.5
10
W
fOSC
Charge Pump Frequency
0.8
1.0
1.3
MHz
1x to 1.5x Mode Transition Dropout Delay
0.4
0.6
0.9
ms
1
mA
TDROPOUT
1.17
Typ
IEN−CTR
Input Leakage Current
On Inputs EN, ENM, ENS
VEN−CTR
High Detect Threshold
Low Detect Threshold
On Inputs EN, ENM, ENS
ISC
Input Current Limit
ILIM
Maximum Input Current
2.4
15.0
30.0
mA
0.8
0.7
1.3
V
0.4
VOUT = GND
30
45
60
mA
VOUT > 1 V
200
400
600
mA
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CAT3606
Block Diagram
1 mF
C1−
C1+ C2−
VIN
3 V to 4.2 V
C2+
1x mode (LDO)
1.5x Charge Pump
VIN
Battery
1 mF
VOUT
COUT
CIN
1 mF
1 mF
Mode Control
1 MHz
Oscillator
LED1
EN
LED2
LED3
LED4
LED5
1.2 V Ref
RSET
RSET
24 kW
ENM
ENS
LED6
Main
Current
Setting
Sub
6 Current
Sink Regulators
LED Output
Select
GND
Figure 2. CAT3606 Functional Block Diagram
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4
20 mA
CAT3606
Basic Operation
At power-up, the CAT3606 starts operation in 1x mode. If
it is able to drive the programmed LED current, it continues
in 1x mode. If the battery voltage drops to a level where the
LED current cannot be met, the driver automatically
switches into 1.5x mode, to boost the output voltage high
enough to achieve the nominal LED current.
The above sequence is reinitialized each and every time
the chip is powered up or is taken out of shutdown mode (via
EN pin). The use of the Main and Sub display enable pins
(ENM or ENS) does not affect the mode of operation.
The enable lines ENM and ENS allow to turn On or Off
a group of LEDs as shown in Table 6.
Table 6. LED Selection
Control Lines
LED Current Setting
The LED current is set by the external resistor RSET
connected between the RSET pin and ground. Table 5 lists
various LED currents and the associated RSET resistor value
for standard 1% precision surface mount resistors.
RSET (kW)
1
649
2
287
5
102
10
49.9
15
32.4
20
23.7
30
15.4
EN
ENM
ENS
Main
LED1 − LED4
Sub
LED5 − LED6
0
X
X
–
–
1
1
1
–
–
1
0
1
ON
−
1
1
0
−
ON
1
0
0
ON
ON
NOTES: 1 = logic high (or VIN)
0 = logic low (or GND)
– = LED output OFF
X = don’t care
Table 5. RSET Resistor Selection
LED Current (mA)
LED Outputs
The unused LED channels can also be turned off by
connecting the respective LED pins to VOUT. In which
case, the corresponding LED driver is disabled and the
typical LED sink current is only about 0.2 mA. When the
following equation is true on any channel, the driver turns
off the LED channel:
VOUT * V LED v 1 V (LED channel OFF)
Note: The CAT3606 is designed to drive LEDs with forward
voltage greater than 1 V and is not compatible with resistive
loads.
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5
CAT3606
TYPICAL CHARACTERISTICS
(VIN = 3.6 V, EN = VIN, ENM = ENS = GND, CIN = COUT = 1 mF, RSET = 24 kW (20 mA per LED), TAMB = 25°C, unless otherwise specified.)
100
1x Mode
90
1.5x Mode
EFFICIENCY (%)
EFFICIENCY (%)
90
100
80
15 mA per LED
70
20 mA per LED
60
50
40
4.2
4.0
3.8
3.6
3.4
3.2
50
100
150
200
TOTAL LED CURRENT (mA)
Figure 3. Efficiency vs. Input Voltage
(6 LEDs)
Figure 4. Efficiency vs. Total LED Current
(6 LEDs)
4
LED CURRENT CHANGE (%)
LED CURRENT CHANGE (%)
0
INPUT VOLTAGE (V)
0.5
6 LEDs at 15 mA
0
−0.5
−1.0
3.0
3.2
3.4
3.6
3.8
4.0
3
2
6 LEDs at 15 mA
VIN = 4 V
1
0
−1
−2
−3
−4
−50
4.2
−25
0
25
50
75
100
INPUT VOLTAGE (V)
TEMPERATURE (°C)
Figure 5. LED Current vs. Input Voltage
Figure 6. LED Current Change vs.
Temperature
125
0.5
GROUND CURRENT (mA)
0.5
GROUND CURRENT (mA)
VIN = 3.2 V (1.5x Mode)
60
40
3.0
1.0
0.4
0.3
0.2
6 LEDs Off
0.1
0
70
50
1.5
−1.5
VIN = 4 V (1x Mode)
80
3.0
3.2
3.4
3.6
3.8
4.0
0.4
0.3
0.2
0
−40
4.2
6 LEDs OFF
RSET = 500 kW
0.1
−20
0
20
40
60
80
INPUT VOLTAGE (V)
TEMPERATURE (°C)
Figure 7. Ground Current vs. Input Voltage
(1x Mode)
Figure 8. Ground Current vs. Temperature
(1x Mode)
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6
100
CAT3606
TYPICAL CHARACTERISTICS
(VIN = 3.6 V, EN = VIN, ENM = ENS = GND, CIN = COUT = 1 mF, RSET = 24 kW (20 mA per LED), TAMB = 25°C, unless otherwise specified.)
GROUND CURRENT (mA)
GROUND CURRENT (mA)
5
4
3
2
VIN = 3.6 V
all LEDs open
1
140
1.5x Mode
120
100
1x Mode
6 LEDs at 15 mA
0
3.0
3.2
3.4
3.6
3.8
4.0
80
4.2
Figure 10. Supply Current vs. Input Voltage
4.2
1.10
CLOCK FREQUENCY (MHz)
CLOCK FREQUENCY (MHz)
4.0
Figure 9. Ground Current vs. Input Voltage
(1.5x Mode)
1.00
0.95
6 LEDs at 20 mA
3.0
3.2
3.4
3.6
3.8
4.0
1.05
1.00
VIN = 3.6 V
6 LEDs at 15 mA
0.95
0.90
−40
4.2
−20
0
40
20
60
80
INPUT VOLTAGE (V)
TEMPERATURE (°C)
Figure 11. Oscillator Frequency vs. Input
Voltage
Figure 12. Oscillator Frequency vs.
Temperature
100
10
OUTPUT RESISTANCE (W)
4
OUTPUT RESISTANCE (W)
3.8
3.6
INPUT VOLTAGE (V)
1.05
3
2
100 mA load
1
0
3.4
3.2
INPUT VOLTAGE (V)
1.10
0.90
3.0
3.0
3.2
3.4
3.6
3.8
4.0
8
100 mA load
6
4
2
4.2
3.0
3.2
3.4
3.6
3.8
4.0
4.2
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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CAT3606
TYPICAL CHARACTERISTICS
(VIN = 3.6 V, EN = VIN, ENM = ENS = GND, CIN = COUT = 1 mF, RSET = 24 kW (20 mA per LED), TAMB = 25°C, unless otherwise specified.)
VIN
50mV/
div
VIN
50mV/div
Input
Current
10mA/
div
Input
Current
10mA/div
VOUT
50mV/
div
VOUT
50mV/div
400 nsec/div
400 nsec/div
Figure 15. Switching Waveforms in 1.5x Mode
Figure 16. Operating Waveforms in 1x Mode
EN
2V/div
EN
2V/div
Input
Current
100mA/
div
Input
Current
100mA/div
VOUT
2V/div
VOUT
2V/div
400 msec/div
400 msec/div
Figure 17. Power Up 6 LEDs at 15 mA,
VIN = 3 V (1.5x Mode)
Figure 18. Power Up 6 LEDs at 15 mA,
VIN = 3.6 V (1x Mode)
LED CURRENT (mA)
100
Vin
3.6V to 4.9V
1V/div
Input
Current
5mA/div
10
VOUT
2V/div
AC coupled
1
0.1
AC coupled
AC coupled
10
100
1000
10,000
200 msec/div
RSET (kW)
Figure 19. LED Current vs. RSET
Figure 20. Line Transient Response
in 1x Mode
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CAT3606
TYPICAL CHARACTERISTICS
(VIN = 3.6 V, EN = VIN, ENM = ENS = GND, CIN = COUT = 1 mF, TAMB = 25°C, unless otherwise specified.)
1.24
4
RSET PIN VOLTAGE (V)
OUTPUT VOLTAGE (V)
5
1x Mode
3
2
1
0
0
100
200
300
400
1.22
1.20
1.18
1.16
−50
500
−25
0
25
50
75
100
125
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
Figure 21. Foldback Current Limiting
Figure 22. RSET Pin Voltage vs. Temperature
ENM & ENS
5V/div
VOUT
1V/div
Tot. LED
Current
50mA/div
200 msec/div
Figure 23. PWM Dimming at 1 kHz on ENM and ENS
Recommended Layout
When the driver is in the 1.5x charge pump mode, the
1 MHz switching frequency operation requires to minimize
trace length and impedance to ground on all 4 capacitors. A
ground plane should cover the area on the bottom side of the
PCB opposite to the IC and the bypass capacitors.
Capacitors Cin and Cout require short connection to ground
which can be done with multiple vias as shown on Figure 24.
A square copper area matches the QFN16 exposed pad
(GND) and must be connected to the ground plane
underneath. The use of multiple via will improve the heat
dissipation.
Figure 24. PCB Layout
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CAT3606
PACKAGE DIMENSIONS
TQFN16, 4x4
CASE 510AE−01
ISSUE A
A
D
DETAIL A
E2
E
PIN#1 ID
PIN#1 INDEX AREA
TOP VIEW
SIDE VIEW
SYMBOL
MIN
NOM
MAX
A
0.70
0.75
0.80
A1
0.00
0.02
0.05
A3
BOTTOM VIEW
e
b
0.20 REF
b
0.25
0.30
0.35
D
3.90
4.00
4.10
D2
2.00
−−−
2.25
E
3.90
4.00
4.10
E2
2.00
−−−
2.25
e
L
D2
A1
L
DETAIL A
0.65 BSC
0.45
−−−
A
0.65
Notes:
(1) All dimensions are in millimeters.
(2) Complies with JEDEC MO-220.
A1
A3
FRONT VIEW
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MECHANICAL CASE OUTLINE
PACKAGE DIMENSIONS
TQFN16, 4x4
CASE 510AE−01
ISSUE A
DATE 18 MAR 2009
A
D
DETAIL A
E2
E
PIN#1 ID
PIN#1 INDEX AREA
TOP VIEW
SIDE VIEW
SYMBOL
MIN
NOM
MAX
A
0.70
0.75
0.80
A1
0.00
0.02
0.05
A3
BOTTOM VIEW
e
b
0.20 REF
b
0.25
0.30
0.35
D
3.90
4.00
4.10
D2
2.00
−−−
2.25
E
3.90
4.00
4.10
E2
2.00
−−−
2.25
e
L
D2
A1
0.65 BSC
0.45
−−−
Notes:
(1) All dimensions are in millimeters.
(2) Complies with JEDEC MO-220.
DOCUMENT NUMBER:
DESCRIPTION:
98AON34374E
TQFN16, 4X4
0.65
L
DETAIL A
A
A1
A3
FRONT VIEW
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Printed versions are uncontrolled except when stamped “CONTROLLED COPY” in red.
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