CAT3636 Datasheet, PDF (4/14 Pages) Catalyst Semiconductor – 6-Channel Quad-ModeTM Fractional LED Driver in TQFN3x3

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
1x
80
70
1.33x
1.5x
2x
100
V_F = 3.3 V
90
80
70
V_F = 3.0 V
60
50
IOUT = 40 mA
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
8 ^VF ^{= 3.3 V}
6
4
2
0
−2
−4
−6
−8
−10
5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0
INPUT VOLTAGE (V)
Figure 5. LED Current Change vs. Input
Voltage
6
V_F = 3.3 V
5
4
10
8
6
4
2
0
−2
−4
−6
−8
−10
−40 −20
0
20
40
TEMPERATURE (°C)
60
80
Figure 6. LED Current Change vs.
Temperature
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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