Datasheet

ADM8843
Rev. C | Page 7 of 16
60
80
100
120
160
180
05050-010
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
2.6 3.0 3.8 4.64.23.4
140
5.0 5.4
–40°C
+25°C
+85°C
Figure 9. Supply Current vs. Supply Voltage over Temperature,
Four LEDs Enabled @ 20 mA/LED
05050-011
CH2 20.0mVCH1 20.0mV M 10.0μs CH1 –12.8mV
2
1
B
W
B
W
V
OUT
V
CC
Figure 10. 1.5× Mode Operating Waveforms
5050-012
CH2 20.0mVCH1 20.0mV M 400ns CH2 2.4mV
2
1
B
W
B
W
V
OUT
V
CC
Figure 11. 1× Mode Operating Waveforms
5050-013
CH2 160mACH1 2.00V M 10.0μs CH2 –2.44mV
2
1
B
W
B
W
C
URRENT
3
V
OUT
CTRL1/2
CH3 1.00V
Figure 12. Soft Start Showing the Initial In-Rush Current and V
OUT
Variation,
Four LEDs @ 20 mA/LED, V
CC
= 3.6 V
05050-014
CH2 20.0mVCH1 20.0mV M 400ns CH2 2.4mV
2
1
B
W
B
W
V
OUT
V
CC
Figure 13. 2× Mode Operating Waveforms
40
45
50
60
80
90
5050-015
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 4.22.93.13.33.53.73.94.1
Figure 14. Power Efficiency vs. Supply Voltage over Li-Ion Range,
Four LEDs @ 20 mA/LED