Typical Characteristics
VIN = 3.6V, TA = 25C, ILED = 25mA, L = 10µH, COUT = 1.0µF, and CIN = 10.0µF.
90%
90%
80%
80%
70%
VIN=2.5V
60%
VIN=2.7V
VIN=3.6V
VIN=4.2V
50%
VIN=4.5V
5
10
15
20
25
LED Current (mA)
Figure 4. 3 LEDs: Efficiency vs. LED Current
vs. Input Voltage
90%
70%
VIN=2.5V
60%
VIN=2.7V
VIN=3.6V
VIN=4.2V
50%
VIN=4.5V
5
10
15
20
25
LED Current (mA)
Figure 5. 4 LEDs: Efficiency vs. LED Current
vs. Input Voltage
90%
80%
80%
70%
VIN=2.5V
60%
VIN=2.7V
VIN=3.6V
VIN=4.2V
VIN=4.5V
50%
5
10
15
20
25
LED Current (mA)
Figure 6. 5 LEDs: Efficiency vs. LED Current
vs. Input Voltage
90%
70%
VIN=2.5V
60%
VIN=2.7V
VIN=3.6V
VIN=4.2V
50%
VIN=4.5V
5
10
15
20
25
LED Current (mA)
Figure 7. 6 LEDs: Efficiency vs. LED Current
vs. Input Voltage
90%
80%
80%
70%
VIN=2.5V
60%
VIN=2.7V
VIN=3.6V
VIN=4.2V
50%
VIN=4.5V
5
10
15
20
25
LED Current (mA)
Figure 8. 7 LEDs: Efficiency vs. LED Current
vs. Input Voltage
70%
60%
VIN=2.9V
VIN=3.6V
VIN=4.2V
VIN=4.5V
50%
5
10
15
20
25
LED Current (mA)
Figure 9. 8 LEDs: Efficiency vs. LED Current
vs. Input Voltage
© 2011 Fairchild Semiconductor Corporation
FAN5345 • Rev. 1.0.0
6
www.fairchildsemi.com