CAT3612
Programmable 300 mA
Camera Flash LED Driver
Description
The CAT3612 is a high−efficiency 1x/1.5x fractional charge pump
with programmable current in two LED channels. Each channel
delivers accurate regulated current up to 150 mA and make CAT3612
ideal for driving one or two flash LEDs.
Low noise operation 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
90%, and is ideal for Li−Ion battery powered devices.
The EN/DIM logic input provides a 1−wire EZDimt interface for
dimming control of the LEDs. When enabled, pulsing the EN/DIM
reduces the LED current on each negative edge in 31 linear steps from
150 mA down to zero current.
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
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TDFN−12
HV2 SUFFIX
CASE 511AN
PIN CONNECTIONS
VIN
C1+
C1−
C2−
GND
LED1
(Top View)
1
VOUT
N/C
EN/DIM
N/C
C2+
LED2
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Dual Matched Regulated LED Channels
300 mA Output Current (150 mA per Channel)
1−wire EZDimt Programmable LED Current
32 Accurate Dimming Levels
Power Efficiency up to 90%
Fractional Pump 1x/1.5x
Low Noise Input Ripple
Fixed High Frequency Operation 1 MHz
“Zero” Current Shutdown Mode
Soft Start and Current Limiting
Short Circuit Protection
Thermal Shutdown Protection
12−lead TDFN 3 mm x 3 mm Package
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
MARKING DIAGRAM
HAAD
AXXX
YWW
HAAF
AXXX
YWW
HAAD = CAT3612HV2-T2
HAAF = CAT3612HV2-GT2
A = Assembly Location
XXX = Last Three Digits of Assembly Lot Number
Y = Production Year (Last Digit)
WW = Production Week (Two Digit)
Applications
ORDERING INFORMATION
Device
CAT3612HV2−T2
(Note 1)
CAT3612HV2−GT2
(Note 2)
Package
TDFN−12
(Pb−Free)
TDFN−12
(Pb−Free)
Shipping
2,000/
Tape & Reel
2,000/
Tape & Reel
•
Camera Flash
•
Cellular Phones
•
Digital Still Cameras
1. Matte−Tin Plated Finish (RoHS−compliant).
2. NiPdAu Plated Finish (RoHS−compliant).
©
Semiconductor Components Industries, LLC, 2010
April, 2010
−
Rev. 2
1
Publication Order Number:
CAT3612/D
CAT3612
1
mF
1
mF
V
IN
3 V to
5.5 V
C
IN
2.2
mF
C1+
VIN
C1− C2+
C2−
VOUT
C
OUT
2.2
mF
LED1
Flash
LED
300 mA
CAT3612
ENABLE/
DIMMING
EN/DIM
GND
LED2
Figure 1. Typical Application Circuit
NOTE:
Unused LED channel must be connected to VOUT
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameter
VIN, LED1, LED2 voltage
VOUT, C1±, C2± voltage
EN/DIM voltage
Storage Temperature Range
Junction Temperature Range
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
I
LED
per LED pin
Total Output Current
NOTE:
Typical application circuit with external components is shown above.
Range
3 to 5.5
−40
to +85
0 to 150
0 to 300
Unit
V
°C
mA
mA
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2
CAT3612
Table 3. ELECTRICAL OPERATING CHARACTERISTICS
(over recommended operating conditions unless specified otherwise) VIN = 3.6 V, EN = High, ambient temperature of 25°C.
Symbol
I
Q
I
QSHDN
I
LED−ACC
I
LED−DEV
R
OUT
F
OSC
I
SC_MAX
I
IN_MAX
I
EN/DIM
V
HI
V
LO
T
SD
T
HYS
V
UVLO
Parameter
Quiescent Current
Shutdown Current
LED Current Accuracy
LED Channel Matching
Output Resistance (open loop)
Charge Pump Frequency
Output short circuit Current Limit
Input Current Limit
EN/DIM Pin
−
Input Leakage
−
Logic High Level
−
Logic Low Level
Thermal Shutdown
Thermal Hysteresis
Undervoltage lock out (UVLO) Threshold
V
OUT
< 0.5 V
1x mode, V
OUT
> 1 V
−1
1.3
165
20
2
Conditions
1x mode, no load
1.5x mode, no load
V
EN
= 0 V
5 mA
≤
I
LED
≤
150 mA
(I
LED
−
I
LEDAVG
) / I
LEDAVG
1x mode, I
OUT
= 100 mA
1.5x mode, I
OUT
= 100 mA
0.8
±3
±3
0.4
2.6
1
60
350
1
0.4
1.3
Min
Typ
0.5
3
1
Max
Unit
mA
mA
%
%
W
MHz
mA
mA
mA
V
V
°C
°C
V
Table 4. RECOMMENDED EN/DIM TIMING
(For 3 V
≤
VIN
≤
5.5 V, over full ambient temperature range
−40°C
to +85°C.)
Symbol
T
SETP
T
LO
T
HI
T
OFF
T
D
T
DEC
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
LED current decrement
T
SETP
EN/DIM
T
D
T
DEC
150mA 145 mA
140 mA
LED
Current
Shutdown
5 mA
0 mA
Shutdown
150 mA
T
LO
T
HI
Conditions
Min
10
0.3
0.3
1.5
40
0.1
T
OFF
200
Typ
Max
Unit
ms
ms
ms
ms
ms
ms
Figure 2. LED Dimming Timing Diagram
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3
CAT3612
TYPICAL CHARACTERISTICS
(VIN = 3.6 V, I
OUT
= 100 mA, C
IN
= C
OUT
= 2.2
mF,
C
1
= C
2
= 1
mF,
T
AMB
= 25°C unless otherwise specified.)
100
90
EFFICIENCY (%)
80
70
60
IOUT = 250 mA
50
IOUT = 100 mA
40
4.2
4.0
3.8
3.6
3.4
3.2
3.0
40
50
100
150
200
250
300
V
F
= 3.4 V
V
F
= 3 V
100
90
EFFICIENCY (%)
80
70
60
50
VIN = 3.2 V (1.5x Mode)
VIN = 4.2 V (1x Mode)
INPUT VOLTAGE (V)
LED CURRENT (mA)
Figure 3. Efficiency vs. Input Voltage
0.8
QUIESCENT CURRENT (mA)
QUIESCENT CURRENT (mA)
0.8
Figure 4. Efficiency vs. LED Current
0.6
0.6
0.4
0.4
0.2
LED Off
0
3.0
3.2
3.4
3.6
3.8
4.0
4.2
0.2
LED Off
0
−40
0
40
TEMPERATURE (°C)
80
120
INPUT VOLTAGE (V)
Figure 5. Quiescent Current vs. Input Voltage
(1x Mode)
6
QUIESCENT CURRENT (mA)
5
4
3
2
1
0
LED Off
3.0
3.2
3.4
3.6
3.8
4.0
4.2
QUIESCENT CURRENT (mA)
6
5
4
3
2
1
Figure 6. Quiescent Current vs. Temperature
(1x Mode)
LED Off
0
−40
0
40
TEMPERATURE (°C)
80
120
INPUT VOLTAGE (V)
Figure 7. Quiescent Current vs. Input Voltage
(1.5x Mode)
Figure 8. Quiescent Current vs. Temperature
(1.5x Mode)
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4
CAT3612
TYPICAL CHARACTERISTICS
(VIN = 3.6 V, I
OUT
= 100 mA, C
IN
= C
OUT
= 2.2
mF,
C
1
= C
2
= 1
mF,
T
AMB
= 25°C unless otherwise specified.)
5
LED CURRENT CHANGE (%)
LED CURRENT CHANGE (%)
4.0
4.2
4
3
2
1
0
−1
−2
−3
−4
−5
1.5x Mode
1x Mode
5
4
3
2
1
0
−1
−2
−3
−4
−5
−40
0
40
TEMPERATURE (°C)
80
120
3.0
3.2
3.4
3.6
3.8
INPUT VOLTAGE (V)
Figure 9. LED Current Change vs. Input
Voltage
1.3
CLOCK FREQUENCY (MHz)
CLOCK FREQUENCY (MHz)
1.2
1.1
1.0
0.9
0.8
0.7
1.3
1.2
1.1
1.0
0.9
0.8
0.7
−40
Figure 10. LED Current Change vs.
Temperature
3.0
3.2
3.4
3.6
3.8
4.0
0
40
TEMPERATURE (°C)
80
120
INPUT VOLTAGE (V)
Figure 11. Oscillator Frequency vs. Input
Voltage
1.0
OUTPUT RESISTANCE (W)
0.8
0.6
0.4
0.2
0
OUTPUT RESISTANCE (W)
4.0
3.5
3.0
2.5
2.0
1.5
1.0
Figure 12. Oscillator Frequency vs.
Temperature
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
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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