CAT3604 Datasheet, PDF (6/11 Pages) Catalyst Semiconductor – 4-Channel Regulated Charge Pump White LED Driver

CAT3604
TYPICAL CHARACTERISTICS
(V_IN = 3.6 V, EN = V_IN, C_IN = C_OUT = 1 mF, R_SET = 24 kW, T_AMB = 25°C, unless otherwise specified.)
100
100
90 1x Mode
80
70
20 mA per LED
60
1.5x Mode
15 mA per LED
90
VIN = 4 V (1x Mode)
80
70
VIN = 3.2 V (1.5x Mode)
60
50
40
4.2 4.0
3.8
3.6
3.4
3.2
3.0
DISCHARGING BATTERY (V)
Figure 3. Efficiency vs. Input Voltage
(4 LEDs)
24
22
1 LED at 20 mA
20
4 LEDs at 20 mA
18
16
4 LEDs at 15 mA
14
12
10
3.0 3.2
3.4
3.6
3.8
4.0
4.2
INPUT VOLTAGE (V)
Figure 5. LED Current vs. Input Voltage
50
40
0
50
100
150
200
TOTAL LED CURRENT (mA)
Figure 4. Efficiency vs. Total LED Current
(4 LEDs)
16.0
4 LEDs at 15 mA
Vin = 4 V
15.5
15.0
14.5
14.0
−50 −25
0
25
50
75 100 125
TEMPERATURE (°C)
Figure 6. LED Current vs. Temperature
0.5
0.5
0.4
0.4
0.3
0.3
0.2
4 LEDs Off
0.1
0
3.0 3.2
3.4
3.6
3.8
4.0
4.2
INPUT VOLTAGE (V)
Figure 7. Ground Current vs. Input Voltage
(1x Mode)
0.2
0.1
4 LEDs OFF
Rset = 500 kW
0
−40 −20
0
20
40 60
80 100
TEMPERATURE (°C)
Figure 8. Ground Current vs. Temperature
(1x Mode)
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