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ADP8863
BACKLIGHT
KEYPAD OR
FUN LIGHTING
VIN
D2
D3
D4
D5
D6
D7
D1
VOUT
VIN
D2
D3
D4
D5
D6
D7
D1
V ALS
1μF
1μF
1μF
VOUT
PHOTO
SENSOR
nRST
ADP8861
C1+
NC
CMP_IN
nRST
SDA
0.1μF
ADP8863
C1+
C1–
C2+
C1
1μF
SDA
SCL
nINT
C1–
C2+
C2–
NC
NC
NC
SCL
C2–
C2
1μF
GNDx
nINT
GNDx
Figure 45. Connecting the ADP8863 to an ADP8861 to Power More LEDs
OPERATING LEDS FROM ALTERNATIVE SUPPLIES
For some applications, it is advantageous to operate the LEDs
from a voltage source other than the ADP8863 charge pump
D1
D2
D3
D4
D5
D6
D7
output. For example, it may be possible to operate a red LED
over the entire battery voltage range without any charge pump
VIN
1μF
boosting. For a charge pump,
I IN = Gain × I OUT
(7)
VDDIO
VOUT
1μF
Therefore, operating the red LEDs directly from the battery
removes output current of the red LEDs from the charge pump
draw. This in turn reduces the total input current by (Gain ? 1) ×
I OUT(red) .
nRST
SDA
VDDIO
VDDIO
ADP8863
C1+
C1–
C2+
C1
1μF
C2
However, care must be taken when selecting LEDs to operate
from a different voltage input. Specifically, the voltage source
SCL
VDDIO
C2–
1μF
must at least be able to support the maximum forward voltage
(Vf) of the LED plus the maximum V HR(UP) (276 mV, given in
nINT
Table 1). Additionally, operating an LED from an independent
GND1
GND2
voltage source may interfere with the ADP8863’s gain selection
algorithm. This algorithm selects the optimal gain for the
charge pump based on all seven diodes. By operating one or
more of the diodes from another supply, the algorithm may not
switch the gain back down to a lower state until the LEDs are
disabled or the part enters standby.
Rev. A | Page 20 of 52
Figure 46. Alternate Schematic for Low Vf LEDs
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