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CAT3636
6-Channel Quad-Mode
[
Fractional LED Driver in
TQFN 3x3
Description
The CAT3636 is a high efficiency Quad−Mode fractional charge
pump that can drive up to six LEDs programmable by a one wire
digital interface. The inclusion of a 1.33x fractional charge pump
mode increases device efficiency by up to 10% over traditional 1.5x
charge pumps with no added external capacitors.
Low noise input ripple is achieved by operating at a constant
switching frequency which allows the use of small external ceramic
capacitors. The multi−fractional charge pump supports a wide range of
input voltages from 2.5 V to 5.5 V.
The EN/SET logic input functions as a chip enable and a “1−wire”
addressable interface for control and current setting of all LEDs. Three
groups of two LEDs can be configured with independent LED currents
between 0.25 mA and 32 mA.
The device is available in a tiny 16−lead TQFN 3 mm x 3 mm
package with a max height of 0.8 mm.
ON Semiconductor’s Quad−Mode
®
1.33x charge pump switching
architecture is patented.
Features
http://onsemi.com
TQFN−16
HV3 SUFFIX
CASE 510AD
PIN CONNECTIONS
EN/S
GND
NC
NC
LEDC2
LEDC1
LEDB2
LEDB1
1
C2−
C2+
C1−
C1+
•
•
•
•
•
•
•
•
•
•
•
•
High Efficiency 1.33x Charge Pump
Quad−Mode Charge Pump: 1x, 1.33x, 1.5x, 2x
Drives up to 6 LEDs at 32 mA Each
1−Wire EZDimt LED Current Programming
Power Efficiency up to 92%
Low Noise Input Ripple in All Modes
“Zero” Current Shutdown Mode
Soft Start and Current Limiting
Short Circuit Protection
Thermal Shutdown Protection
Tiny 3 mm x 3 mm, 16−lead TQFN Package
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
LCD Display Backlight
Color RGB LEDs
Cellular Phones
Digital Still Cameras
Handheld Devices
LEDA2
LEDA1
(Top View)
MARKING DIAGRAMS
JAAA
AXXX
YWW
JAAR
AXXX
YWW
Applications
JAAA = CAT3636HV3−T2
JAAR = CAT3636HV3−GT2
A = Assembly Location
XXX = Last Three Digits of Assembly Lot Number
Y = Production Year (Last Digit)
WW = Production Week (Two Digits)
•
•
•
•
•
ORDERING INFORMATION
Device
CAT3636HV3−T2
(Note 1)
CAT3636HV3−GT2
(Note 2)
Package
TQFN−16
(Pb−Free)
TQFN−16
(Pb−Free)
Shipping
2,000/
Tape & Reel
1. Matte−Tin Plated Finish (RoHS−compliant).
2. NiPdAu Plated Finish (RoHS−compliant).
©
Semiconductor Components Industries, LLC, 2010
May, 2010
−
Rev. 7
1
Publication Order Number:
CAT3636/D
VOUT
VIN
CAT3636
1
mF
1
mF
pair A
pair B
pair C
C
OUT
1
mF
20 mA
V
IN
2.5 V to C
IN
5.5 V
1
mF
One wire
programming
C1− C1+ C2− C2+
VIN
VOUT
CAT3636
LEDA1
LEDA2
LEDB1
EN/SET
LEDB2
LEDC1
LEDC2
GND
Figure 1. Typical Application Circuit
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameter
VIN, LEDx, C1±, C2± voltage
VOUT Voltage
EN/SET Voltage
Storage Temperature Range
Junction Temperature Range (Note 3)
Lead Temperature
Rating
6
7
VIN + 0.7 V
−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 (Note 3)
I
LED
per LED pin
Total Output Current
3. Package thermal resistance is below 50°C/W when mounted on FR4 board.
NOTES: Typical application circuit with external components is shown above.
Range
2.5 to 5.5
−40
to +85
0 to 32
0 to 192
Unit
V
°C
mA
mA
http://onsemi.com
2
CAT3636
Table 3. ELECTRICAL OPERATING CHARACTERISTICS
Symbol
I
Q
Name
Quiescent Current
(over recommended operating conditions unless specified otherwise) VIN = 3.6 V, EN = High, T
AMB
= 25°C
Conditions
1x mode, VIN = 4.2 V
1.33x mode, VIN = 3.3 V
1.5x mode, VIN = 2.8 V
2x mode, VIN = 2.5 V
V
EN
= 0 V
1 mA
≤
I
LED
≤
31 mA
I
LED
*
I
LEDAVG
I
LEDAVG
R
OUT
Output Resistance (open loop)
1x mode, I
OUT
= 100 mA
1.33x mode, I
OUT
= 100 mA
1.5x mode, I
OUT
= 100 mA
2x mode, I
OUT
= 100 mA
1.33x and 2x mode
1.5x mode
V
OUT
< 0.5 V
0.6
0.8
0.5
4.5
3.5
6
0.8
1.1
80
150
V
IN
−
Highest LED V
F
V
OUT
> 1 V
400
500
450
100
0.4
150
20
2
1.1
1.4
W
±3
±1
Min
Typ
1.5
2.8
3.7
3.8
1
Max
Units
mA
I
QSHDN
I
LED−ACC
I
LED−DEV
Shutdown Current
LED Current Accuracy
LED Channel Matching
mA
%
%
F
OSC
I
SC_MAX
LED
TH
V
HYS
T
DF
I
IN_MAX
R
EN/DIM
V
HI
V
LO
T
SD
T
HYS
V
UVLO
Charge Pump Frequency
Output short circuit Current Limit
1x to 1.33x or 1.33x to 1.5x or 1.5x to 2x
Transition Thresholds at any LEDxx pin
1.33x to 1x Transition Hysteresis
Transition Filter Delay
Input Current Limit
EN/DIM Pin
−
Internal Pull−down Resistor
−
Logic High Level
−
Logic Low Level
Thermal Shutdown
Thermal Hysteresis
Undervoltage lockout (UVLO) threshold
MHz
mA
mV
mV
ms
mA
kW
V
V
°C
°C
V
1.3
Table 4. RECOMMENDED EN/SET TIMING
(For 2.5
≤
VIN
≤
5.5 V, over full ambient temperature range
−40
to +85°C.)
Symbol
T
SETUP
T
LO
T
HI
T
OFF
T
DATADELAY
T
RESETDELAY
Name
EN/SET setup from shutdown
EN/SET program low time
EN/SET program high time
EN/SET low time to shutdown
EN/SET Delay to DATA
EN/SET Delay High to ADDRESS
Conditions
Min
10
0.2
0.2
1.5
500
2
1000
Typ
Max
100 (Note 4)
100
100
Units
ms
ms
ms
ms
ms
ms
4. If the Max value is exceeded then the user should wait 2 ms before trying to program the device again.
Figure 2. EN/SET One Wire Addressable Timing Diagram
http://onsemi.com
3
CAT3636
TYPICAL PERFORMANCE CHARACTERISTICS
(V
IN
= 3.6 V, I
OUT
= 120 mA (6 LEDs at 20 mA), C
IN
= C
OUT
= C1 = C2 = 1
mF,
T
AMB
= 25°C unless otherwise specified.)
100
V
F
= 3.3 V
90
EFFICIENCY (%)
80
70
60
50
IOUT = 40 mA
40
4.5
4.0
3.5
3.0
INPUT VOLTAGE (V)
2.5
2.0
1x
2x
1.33x
1.5x
EFFICIENCY (%)
100
90
80
70
60
50
40
4.2
4.0
3.8
3.6
3.4
INPUT VOLTAGE (V)
3.2
3.0
Traditional 1.5x
Charge Pump
V
F
= 3.3 V
V
F
= 3.0 V
Figure 3. Efficiency vs. Input Voltage
10
LED CURRENT VARIATION (%)
6
4
2
0
−2
−4
−6
LED CURRENT VARIATION (%)
8
V
F
= 3.3 V
10
8
6
4
2
0
−2
−4
−6
−8
−10
−40
Figure 4. Efficiency vs. Li−Ion Voltage
−8
−10
5.5
5.0
4.5
4.0
3.5
3.0
INPUT VOLTAGE (V)
2.5
2.0
−20
0
20
40
TEMPERATURE (°C)
60
80
Figure 5. LED Current Change vs. Input
Voltage
6
V
F
= 3.3 V
QUIESCENT CURRENT (mA)
5
4
3
2
1
0
Figure 6. LED Current Change vs.
Temperature
5.5
5.0
4.5
4.0
3.5
3.0
INPUT VOLTAGE (V)
2.5
2.0
Figure 7. Quiescent Current vs. Input Voltage
http://onsemi.com
4
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