CAT3661
TYPICAL CHARACTERISTICS
(VIN = 3 V, I LED = 3 mA, V F = 3 V, T AMB = 25 ° C, typical application circuit unless otherwise specified.)
225
200
175
2x
1.5x
140
120
1.5x
150
1.33x
1x
100
1.33x, 2x
125
? 40
0
40
80
120
80
? 40
0
40
80
120
TEMPERATURE ( ° C)
Figure 7. Quiescent Current vs. Temperature
TEMPERATURE ( ° C)
Figure 8. Switching Frequency vs.
Temperature
2.0
1.6
1.2
0.8
0.4
0
? 0.4
? 0.8
? 1.2
? 1.6
2.0
1.5
1.0
0.5
0
? 0.5
? 1.0
? 1.5
V F = 3 V
? 2.0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
? 2.0
? 40
0
40
80
120
100
INPUT VOLTAGE (V)
Figure 9. LED Current Change vs. Input
Voltage
100
TEMPERATURE ( ° C)
Figure 10. LED Current Change vs.
Temperature
90
1x
1.33x
1.5x
90
1.33x
1.5x
80
70
60
80
70
60
50
2x
50
2x
40
4.5
V F = 3 V
4.0
3.5
3.0
2.5
2.0
40
3.2
V F = 3 V
3.0
2.8
2.6
2.4
2.2
2.0
INPUT VOLTAGE (V)
Figure 11. Efficiency vs. Input Voltage
INPUT VOLTAGE (V)
Figure 12. Efficiency vs. Lithium Coin Cell
Voltage
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