CAT3644 Datasheet, PDF (5/14 Pages) Catalyst Semiconductor – 4-Channel Ultra High Efficiency Quad-Mode TM LED Driver

CAT3644
TYPICAL PERFORMANCE CHARACTERISTICS
(V_IN = 3.6 V, I_OUT = 80 mA (4 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
1x
80
1.33x
1.5x
2x
100
V_F = 3.3 V
90
1x
80
1.33x
70
70
60
60
50
40
4.5
4.0
3.5
3.0
2.5
2.0
INPUT VOLTAGE (V)
Figure 3. Efficiency vs. Input Voltage
50
40
4.2 4.0
3.8
3.6
3.4
3.2 3.0
INPUT VOLTAGE (V)
Figure 4. Efficiency vs. Li−Ion Voltage
4
V_F = 3.3 V
3
2
1
LEDs Off
0
5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0
INPUT VOLTAGE (V)
Figure 5. Quiescent Current vs. Input Voltage
4
3
2x
1.5x
2
1
1.33x
1x
0
−40
0
40
80
120
TEMPERATURE (°C)
Figure 6. Quiescent Current vs. Temperature
10
10
8 V_F = 3.3 V
6
8 V_F = 3.3 V
6
4
4
2
2
0
0
−2
−2
−4
−4
−6
−6
−8
−8
−10
−10
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
−40
0
40
80
120
INPUT VOLTAGE (V)
TEMPERATURE (°C)
Figure 7. LED Current Change vs. Input
Voltage
Figure 8. LED Current Change vs.
Temperature
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