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ADM8843
USING SMALLER CAPACITOR VALUES
The ADM8843 can be operated with the smaller capacitor values described here to reduce capacitor footprint sizes.
Option 1
Input and output ripple plots for 1× and 1.5× modes of operation
are shown with C1, C2 = 0.22 μF; C3 = 0.47 μF; and C4 = 1 μF.
Option 2
Input and output ripple plots for 1× and 1.5× modes of operation
are shown with C1, C2 = 0.22 μF; C3 = 0.47 μF; and C4 = 4.7 μF.
V CC
2
V CC
2
V OUT
3
V OUT
3
CH2 10.0mV
B
W
M 400ns CH3
–33mV
CH2 10.0mV
B
W
M 1.00 μ s CH3
–33mV
CH3 10.0mV
B
W
CH3 10.0mV
B
W
Figure 26. 1× Mode Operation, Four LEDs with 20 mA/LED at V CC = 5.0 V,
with a 1 μF V CC Decoupling Capacitor
Figure 28. 1× Mode Operation, Four LEDs with 20 mA/LED at V CC = 5.0 V,
with a 4.7 μF V CC Decoupling Capacitor
V CC
V OUT
2
3
V CC
V OUT
2
3
CH3 50.0mV
B
W
CH2 20.0mV
B
W
M 400ns CH3
–33mV
CH3 50.0mV
B
W
CH2 20.0mV
B
W
M 400ns CH3
–33mV
Figure 27. 1.5× Mode Operation, Four LEDs with 20 mA/LED at V CC = 3.6 V,
with a 1 μF V CC Decoupling Capacitor
Figure 29. 1.5× Mode Operation, Four LEDs with 20 mA/LED at V CC = 3.6 V,
with a 4.7 μF V CC Decoupling Capacitor
Rev. C | Page 14 of 16
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