ADP8861 Analog Devices, ADP8861 Datasheet - Page 11

• Manufacturer Part Number: ADP8861
• Description: Charge Pump, 7-Channel Smart LED Driver with I2C Interface
• Manufacturer: Analog Devices

Specifications of ADP8861

• Vin Range: 2.5 to 5.5V
• Vout (v): 4.3 to 5.5
• Synchronous: No
• Package: 20-Lead LFCSP,20-Lead WLCSP
• Led Configuration: Parallel
• Topology: Capacitive
• I2c Support: Yes
• Max Iout (ma): 60mA
• Brightness Control: PWM
• Peak Efficiency (%): 89%
• Switching Frequency: 1.32MHz
• Over Volt Protection (v): 5.8V

THEORY OF OPERATION
The ADP8861 provides a powerful charge pump driver with
programmable LED control. Up to seven LEDs can be indepen-
dently driven up to 30 mA (typical) each. 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
VBAT
VDDIO
nRST
nINT
SDA
SCL
VIN
C
IN
ID1
VIN
NOISE FILTER
LOGIC
RESET
STNDBY
I
2
50µs
D1
C
ID2
UVLO
D2
ID3
STANDBY
SWITCH CONTROL
CURRENT SINK CONTROL
Figure 25. Detailed Block Diagram
D3
ID4
Rev. A | Page 11 of 40
EN
D4
ID5
VIN
D5
V
I
ID6
REFS
REFS
LEDs. A full suite 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.
GND1
D6
ID7
CLK
GND2
D7
CHARGE
SELECT
LOGIC
LOGIC
PUMP
GAIN
(1×, 1.5×, 2×)
CHARGE
PUMP
START
SOFT
I
SS
V
IN
C1+
C1–
C2+
C2–
VOUT
C
C1
1µF
C2
1µF
OUT
ADP8861