CAT3637 Datasheet, PDF (5/14 Pages) Catalyst Semiconductor – 6-Channel Programmable High Efficiency Quad-Mode™ LED Driver

CAT3637
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
1x
80
1.33x
1.5x
2x
100
V_F = 3.3 V
90
80
V_F = 3.0 V
70
70
60
50
40
4.5
4.0
3.5
3.0
2.5
2.0
INPUT VOLTAGE (V)
Figure 3. Efficiency vs. Input Voltage
60
Traditional 1.5x
50
Charge Pump
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
10
10
8
V_F = 3.3 V
8
6
6
4
4
2
2
0
0
−2
−2
−4
−4
−6
−6
−8
−8
−10
−10
5.5 5.0
4.5
4.0
3.5
3.0
2.5
−40 −20
0
20
40
60
80
INPUT VOLTAGE (V)
TEMPERATURE (°C)
Figure 5. LED Current Change vs. Input
Voltage
Figure 6. LED Current Change vs.
Temperature
6
V_F = 3.3 V
5
4
3
2
1
0
5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0
INPUT VOLTAGE (V)
Figure 7. Quiescent Current vs. Input Voltage
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