Analog Devices ADP8861DBCB Evaluation Board ADP8861DBCB-EVALZ ADP8861DBCB-EVALZ Data Sheet
Product codes
ADP8861DBCB-EVALZ
Charge Pump, 7-Channel
Smart LED Driver with I
2
C Interface
Data Sheet
Rev. B
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responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
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Trademarks and registered trademarks are the property of their respective owners.
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FEATURES
Charge pump with automatic gain selection of 1×, 1.5×, and 2×
for maximum efficiency
7 independent, programmable LED drivers
7 drivers capable of 30 mA (typical)
1 driver also capable of 60 mA (typical)
1 driver also capable of 60 mA (typical)
Programmable maximum current limit (128 levels)
Standby mode for <1 μA current consumption
16 programmable fade in and fade out times
Standby mode for <1 μA current consumption
16 programmable fade in and fade out times
0.1 sec to 5.5 sec
Choose from linear, square, or cubic rates
Choose from linear, square, or cubic rates
Fading override
I
I
2
C-compatible interface for all programming
Dedicated reset pin and built-in power-on reset (POR)
Short-circuit, overvoltage, and overtemperature protection
Internal soft start to limit inrush currents
Input-to-output isolation during faults or shutdown
Operation down to V
Short-circuit, overvoltage, and overtemperature protection
Internal soft start to limit inrush currents
Input-to-output isolation during faults or shutdown
Operation down to V
IN
= 2.5 V with undervoltage lockout
(UVLO) at V
IN
= 2.0 V
Available in a small 20-ball, 2.15 mm × 2.36 mm × 0.6 mm
WLCSP or a 20-lead, 4 mm × 4 mm × 0.75 mm LFCSP
APPLICATIONS
Mobile display backlighting
Mobile phone keypad backlighting
Dual RGB backlighting
LED indication
General backlighting of small format displays
Mobile phone keypad backlighting
Dual RGB backlighting
LED indication
General backlighting of small format displays
TYPICAL OPERATING CIRCUIT
D1
D2
D3
D4
D5
D6
D7
VDDIO
nRST
VDDIO
SDA
VDDIO
SCL
VDDIO
nINT
VIN
C
IN
1µF
GND1
GND2
C2+
C2–
C2
1µF
1µF
C1+
C1–
C1
1µF
1µF
VOUT
C
OUT
1µF
ADP8861
08391-
001
Figure 1.
GENERAL DESCRIPTION
The ADP8861 provides a powerful charge pump driver with
independent control of up to seven LEDs. These seven LEDs
can be independently driven up to 30 mA (typical). The seventh
LED can also be driven to 60 mA (typical). All LEDs are pro-
grammable for maximum current and fade in/out times via
the I
independent control of up to seven LEDs. These seven LEDs
can be independently driven up to 30 mA (typical). The seventh
LED can also be driven to 60 mA (typical). All LEDs are pro-
grammable for maximum current and fade in/out times via
the I
2
C interface. These LEDs can also be combined into groups to
reduce the processor instructions during fade in/out.
This entire configuration is driven by a two-capacitor charge
pump with gains of 1×, 1.5×, and 2×. The charge pump is
capable of driving a maximum I
pump with gains of 1×, 1.5×, and 2×. The charge pump is
capable of driving a maximum I
OUT
of 240 mA from a supply
of 2.5 V to 5.5 V. A full suite of safety features, including short-
circuit, overvoltage, and overtemperature protection, allows
easy implementation of a safe and robust design. Additionally,
input inrush currents are limited via an integrated soft start
combined with controlled input-to-output isolation.
circuit, overvoltage, and overtemperature protection, allows
easy implementation of a safe and robust design. Additionally,
input inrush currents are limited via an integrated soft start
combined with controlled input-to-output isolation.