CAT3604V
4-Channel Quad-Mode
)
LED
Driver with Open/Short LED
Detection
Description
The CAT3604V is a high efficiency Quad−Mode
®
fractional charge
pump that can drive up to four LEDs with input supply voltages as low
as 2.5 V.
An external RSET resistor is used to control the LED channel
brightness while channel diagnostics include automatic detection for
both short and open LED channel conditions, ensuring the CAT3604V
maintains the highest efficiency level in all operating modes.
Each operating mode uses a constant high frequency switching
scheme which allows the use of small form factor external ceramic
capacitors while delivering excellent low noise input supply ripple up
to 5.5 volts.
The EN input control supports direct PWM dimming and can
accommodate dimming frequencies in excess of 10 kHz thereby
providing extremely high resolution brightness levels.
The device is available in the 16−pad low profile 0.8 mm thin QFN
(4 mm x 4 mm).
Features
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TQFN−16
HV4 SUFFIX
CASE 510AE
PIN CONNECTIONS
LED1
LED2
LED3
LED4
EN
NC
NC
NC
1
GND
GND
C2+
C2−
C1−
•
•
•
•
•
•
•
•
•
•
•
Quad−mode Charge Pump: 1x, 1.33x, 1.5x, 2x
Drives up to 4 LEDs at 30 mA Each
Pin Compatible with Industry Standard ’604
Open/Short LED Automatic Detection
Power Efficiency up to 92%
High Resolution PWM Dimming
Low Noise Supply Ripple in All Modes
Soft Start and Current Limiting
Short Circuit and Thermal Overload Protection
16−Pad TQFN Package, 4 mm x 4 mm
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
LCD Display Backlight
Cellular Phones
Digital Still Cameras
Handheld Devices
RSET
(4 x 4 mm) (Top View)
MARKING DIAGRAMS
CDAK
AXXX
YMCC
CDAF
AXXX
YMCC
Applications
CDAK = CAT3604VHV4−GT2
CDAF = CAT3604VHV4−T2
A = Assembly Location
XXX = Last Three Digits of Assembly Lot Number
Y = Production Year (Last Digit)
M = Production Month (1−9, A, B, C)
CC = Country of Origin (Two Digit)
Note: Two digit code for country of origin:
Thailand = TH
Malaysia = MY
•
•
•
•
ORDERING INFORMATION
Device
CAT3604VHV4−GT2
(Note 1)
CAT3604VHV4−T2
Package
TQFN−16
(Pb−Free)
TQFN−16
(Pb−Free)
Shipping
2,000/
Tape & Reel
1. NiPdAu Plated Finish (RoHS−compliant).
For other finishes, please contact factory.
©
Semiconductor Components Industries, LLC, 2010
VOUT
April, 2010
−
Rev. 3
1
Publication Order Number:
CAT3604V/D
C1+
VIN
CAT3604V
1
mF
1
mF
2.4 V
to
5.5 V
V
IN
C
IN
1
mF
C1+ C1− C2+ C2−
VIN
VOUT
CAT3604V
EN
RSET
LED1
LED2
LED3
LED4
V
OUT
C
OUT
1
mF
ON OFF
20 mA
4.02 kΩ
GND
Figure 1. Typical Application Circuit
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameter
VIN, LEDx, C1±, C2± voltage
VOUT voltage
EN voltage
Storage Temperature Range
Junction Temperature Range
Lead Temperature
Rating
6
7
6
−65
to +160
−40
to +150
300
Unit
V
V
V
°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
VIN
Ambient Temperature Range
I
LED
per LED pin
Total Output Current
LED Forward Voltage Range
NOTE:
Typical application circuit with external components is shown above.
Rating
2.5 to 5.5
−40
to +85
0 to 25
0 to 100
1.3 to 4.3
Unit
V
_C
mA
mA
V
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2
CAT3604V
Table 3. ELECTRICAL OPERATING CHARACTERISTICS
(over recommended operating conditions unless specified otherwise) V
IN
= 3.6 V, EN = High, T
AMB
= 25°C.
Symbol
I
Q
Quiescent Current
Name
Conditions
1x mode, no load
1.33x mode, no load
1.5x mode, no load
2x mode, no load
V
EN
= 0 V
I
LEDAVG
/ I
LEDAVG−NOMINAL
(I
LED
−
I
LEDAVG
) / I
LEDAVG
R
SET
= 34.0 kW
R
SET
= 5.23 kW
R
SET
= 2.67 kW
0.58
1x mode
1.33x mode, V
IN
= 3 V
1.5x mode, V
IN
= 2.7 V
2x mode, V
IN
= 2.4 V
1.33x and 2x mode
1.5x mode
V
OUT
< 0.5 V
V
OUT
> 1 V
0.8
1
±2
±1.5
2.4
15
30
0.6
0.8
5
5
10
1
1.3
50
250
130
400
100
1.3
0.4
150
20
1.6
1.8
2.0
1.3
1.6
0.62
Min
Typ
1.0
1.7
2.2
2.4
1
Max
Units
mA
I
QSHDN
I
LED−ACC
I
LED−DEV
I
LED
Shutdown Current
LED Current Accuracy
LED Channel Matching
Programmed LED Current
mA
%
%
mA
V
RSET
R
OUT
RSET Regulated Voltage
Output Resistance (open loop)
V
W
F
OSC
I
SC_MAX
I
IN_MAX
LED
TH
V
HYS
R
EN
V
HI
V
LO
T
SD
T
HYS
V
UVLO
Charge Pump Frequency
Output short circuit Current Limit
Input Current Limit
1x to 1.33x, 1.33x to 1.5x or 1.5x to 2x
Transition Thresholds at any LED pin
1x Mode Transition Hysteresis
EN Pin
−
Internal Pull−down Resistor
−
Logic High Level
−
Logic Low Level
Thermal Shutdown
Thermal Hysteresis
Undervoltage lockout (UVLO) threshold
MHz
mA
mA
mV
mV
kW
V
V
°C
°C
V
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3
CAT3604V
Table 4. A.C. CHARACTERISTICS
(For 2.5 V
≤
VIN
≤
5.5 V, over full ambient temperature range
−40
to +85°C.)
Symbol
T
LED
T
MD
T
PWRDWN
T
LED−ON
T
LED−OFF
Name
LED current settling time from shutdown mode
Mode transition time
Device power down delay
LED on settling time
LED off settling time
Conditions
1x mode, V
IN
= 4 V
1.33x mode, V
IN
= 3.5 V
Min
Typ
40
400
500
0.9
1
120
1.5
Max
Units
ms
ms
ms
ms
ns
Figure 2. CAT3604V Timing Characteristics
LED Current Setting
The nominal 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.
Table 5. RESISTOR RSET AND LED CURRENT
LED Current (mA)
2
5
10
15
20
25
30
RSET (kW)
40.0
15.8
7.87
5.23
4.02
3.16
2.67
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4
CAT3604V
TYPICAL PERFORMANCE CHARACTERISTICS
(V
IN
= 3.6 V, I
OUT
= 80 mA (4 LEDs at 20 mA), C
IN
= C
OUT
= C
1
= C
2
= 1
mF,
T
AMB
= 25°C unless otherwise specified.)
100
V
F
= 3.3 V
90
EFFICIENCY (%)
80
70
60
50
40
EFFICIENCY (%)
1x
1.33x
1.5x
80
70
60
50
40
90
1x
1.33x
100
V
F
= 3.3 V
2x
4.5
4.0
3.5
3.0
2.5
2.0
4.2
4.0
3.8
3.6
3.4
3.2
3.0
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Figure 3. Efficiency vs. Input Voltage
4
QUIESCENT CURRENT (mA)
QUIESCENT CURRENT (mA)
V
F
= 3.3 V
3
4
Figure 4. Efficiency vs. Li−Ion Voltage
3
2x
1.5x
2
2 1.33x
1x
1
1
LEDs Off
0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
0
−40
0
40
TEMPERATURE (°C)
80
120
INPUT VOLTAGE (V)
Figure 5. Quiescent Current vs. Input Voltage
10
LED CURRENT VARIATION (%)
6
4
2
0
−2
−4
−6
−8
−10
LED CURRENT VARIATION (%)
8
V
F
= 3.3 V
10
8
6
4
2
0
−2
−4
−6
Figure 6. Quiescent Current vs. Temperature
V
F
= 3.3 V
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
−8
−10
−40
0
40
TEMPERATURE (°C)
80
120
INPUT VOLTAGE (V)
Figure 7. LED Current Change vs. Input
Voltage
Figure 8. LED Current Change vs.
Temperature
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