Datasheet

ADM8845
Rev. C | Page 8 of 20
04867-0-016
CH2 20.0mVCH1 20.0mV M 400ns CH1 220mV
2
1
B
W
B
W
V
OUT
V
CC
Figure 15. 1× Mode Operating Waveforms
40
45
50
60
80
90
04867-0-017
V
CC
(V)
POWER EFFICIENCY (%)
70
55
65
75
85
V
F
= 4.0V
V
F
= 3.8V
V
F
= 4.3V
V
F
= 3.2V
V
F
= 3.6V
2.8 3.0 3.4 3.83.63.2 4.0 4.22.9 3.1 3.3 3.5 3.7 3.9 4.1
Figure 16. Power Efficiency vs. Supply Voltage over Li-Ion Range,
Six LEDS @ 15 mA/LED
40
45
50
60
80
90
04867-0-018
V
CC
(V)
POWER EFFICIEN
C
Y (%)
70
55
65
75
85
V
F
= 4.0V
V
F
= 3.8V
V
F
= 4.3V
V
F
= 3.2V
V
F
= 3.6V
2.8 3.0 3.4 3.83.63.2 4.0 4.22.9 3.1 3.3 3.5 3.7 3.9 4.1
Figure 17. Power Efficiency vs. Supply Voltage over Li-Ion Range,
Four LEDS @ 15 mA/LED
40
45
50
60
80
90
04867-0-019
V
CC
(V)
POWER EFFICIEN
C
Y (%)
70
55
65
75
85
V
F
= 4.0V
V
F
= 3.8V
V
F
= 4.3V
V
F
= 3.2V
V
F
= 3.6V
2.8 3.0 3.4 3.83.63.2 4.0 4.22.9 3.1 3.3 3.5 3.7 3.9 4.1
Figure 18. Power Efficiency vs. Supply Voltage over Li-Ion Range,
Six LEDS @ 20 mA/LED
40
45
50
60
80
90
04867-0-020
V
CC
(V)
POWER EFFICIEN
C
Y (%)
2.8 3.0 3.4 3.83.63.2
70
4.0 4.2
55
65
75
85
2.9 3.1 3.3 3.5 3.7 3.9 4.1
V
F
= 4.0V
V
F
= 3.8V
V
F
= 4.3V
V
F
= 3.2V
V
F
= 3.6V
Figure 19. Power Efficiency vs. Supply Voltage over Li-Ion Range
Four LEDS @ 20 mA/LED
04867-0-021
CH1 2.00V CH2 2.00V M10.0ms CH2 4.36V
2
1
V
OUT
CTRL1/2
: 44.0ms
@: –44.4ms
C2 FALL
200s
LOW SIGNAL
AMPLITUDE
Figure 20. TPC Delay