Datasheet

CAT3649
http://onsemi.com
6
TYPICAL PERFORMANCE CHARACTERISTICS
(V
IN
= 3.6 V, PWM = V
IN
, I
OUT
= 120 mA (6 LEDs at 20 mA), C
IN
= C
OUT
= C
1
= C
2
= 1 mF, C
PWM
= 47 nF,
T
AMB
= 25°C unless otherwise specified.)
Figure 10. Efficiency vs. Input Voltage Figure 11. Efficiency vs. Li−Ion Voltage
INPUT VOLTAGE (V) INPUT VOLTAGE (V)
2.02.53.03.54.04.5
40
50
60
70
80
90
100
3.03.23.43.63.84.04.2
40
50
60
70
80
90
100
Figure 12. Power Up in 1x Mode Figure 13. Power Up in 1.33x Mode
Figure 14. Power Up in 1.5x Mode Figure 15. Power Up in 2x Mode
EFFICIENCY (%) EFFICIENCY (%)
V
F
= 3.30 V, I
LED
= 20 mA
V
F
= 3.05 V, I
LED
= 10 mA
1x
1.33x
1.5x
2x
V
F
= 3.30 V, I
LED
= 20 mA
V
F
= 3.05 V, I
LED
= 10 mA
1x
1.33x 1.5x