Datasheet

ADP8863
Rev. A | Page 11 of 52
THEORY OF OPERATION
The ADP8863 combines a powerful LED charge pump driver
with independent control of up to seven LEDs. These LED
drivers can sink up to 30 mA (typical) on six channels. The
seventh LED can also be driven to 60 mA (typical). All LEDs
can be individually programmed or combined into a group to
operate backlight LEDs. A full set of safety features, including
short-circuit, overvoltage, and overtemperature protection with
input-to-output isolation, allows for a robust and safe design.
The integrated soft start limits inrush currents at startup, restart
attempts, and gain transitions.
GND2
nINT
VOUT
C
IN
VIN
STNDBY
EN
VIN
VIN
VBAT
C1+
SDA
SCL
VDDIO
STANDBY
SWITCH CONTROL
CURRENT SINK CONTROL
C1–
C2+
C2–
nRST
NOISE FILTER
50µs
RESET
D2 D3
D4 D5
D6 D7 CMP_IN
D1
ID1
ID2
ID3
ID4 ID5
ID6
ID7
SOFT START
OPTIONAL
PHOTOSENSOR
GND1
CLK
UVLO
08392-024
V
REFS
I
REFS
C
OUT
I
SS
V
IN
GAIN
SELECT
LOGIC
CHARGE
PUMP
LOGIC
LIGHT
SENSOR
LOGIC
PHOTOSENSOR
CONVERSION
CHARGE
PUMP
(1×, 1.5×, 2×)
C1
1µF
C2
1µF
I
2
C
LOGIC
V
ALS
Figure 26. Detailed Block Diagram