Analog Devices ADP8866 Evaluation Board ADP8866CP-EVALZ ADP8866CP-EVALZ Data Sheet
Product codes
ADP8866CP-EVALZ
Charge Pump Driven 9-Channel LED Driver with
Automated LED Lighting Effects
ADP8866
Rev. 0
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responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
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Tel: 781.329.4700
Tel: 781.329.4700
Fax: 781.461.3113
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FEATURES
Charge pump with automatic gain selection of 1×, 1.5×, and
2× for maximum efficiency
92% peak efficiency
9 independent and programmable LED drivers
Each driver is capable of 25 mA (full scale)
Each driver has 7 bits (128 levels) of nonlinear current
9 independent and programmable LED drivers
Each driver is capable of 25 mA (full scale)
Each driver has 7 bits (128 levels) of nonlinear current
settings
Standby mode for <1 µA current consumption
16 programmable fade-in and fade-out times (0.0 sec to
16 programmable fade-in and fade-out times (0.0 sec to
1.75 sec) with choice of square or cubic rates
Automated and customizable LED blinking
Unique heartbeat mode for programmable double pulse
Unique heartbeat mode for programmable double pulse
lighting effects on 4 channels (D6 to D9)
PWM input for implementing content adjustable brightness
control (cABC)
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
Operates down to V
Short circuit, overvoltage, and overtemperature protection
Internal soft start to limit inrush currents
Input to output isolation during faults or shutdown
Operates down to V
IN
= 2.5 V, with undervoltage lockout
(UVLO) at 1.9 V
Small lead frame chip scale package (LFCSP)
APPLICATIONS
Mobile display backlighting
Mobile phone keypad backlighting
LED indication and status lights
Automated LED blinking
Mobile phone keypad backlighting
LED indication and status lights
Automated LED blinking
TYPICAL OPERATING CIRCUIT
09478-
001
D1
D2
D3
D4
D5
D7
D6
D8
D9
nRST
SDA
SCL
nINT
GND
VIN
1µF
C2+
C2–
C2
1µF
1µF
C1+
C1–
C1
1µF
1µF
VOUT
1µF
ADP8866
Figure 1.
GENERAL DESCRIPTION
The ADP8866 combines a programmable backlight LED charge
pump driver with automatic blinking functions. Nine LED drivers
can be independently programmed at currents up to 25 mA.
The current level, fade time, and blinking rate can be programmed
once and executed autonomously on a loop. Separate fade-in
and fade-out times can be set for the backlight LEDs.
pump driver with automatic blinking functions. Nine LED drivers
can be independently programmed at currents up to 25 mA.
The current level, fade time, and blinking rate can be programmed
once and executed autonomously on a loop. Separate fade-in
and fade-out times can be set for the backlight LEDs.
Driving all of this is a two-capacitor charge pump with gains of
1×, 1.5×, and 2×. This setup is capable of driving a maximum
I
1×, 1.5×, and 2×. This setup 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 over-
temperature protection allows easy implementation of a safe
and robust design. Additionally, input inrush currents are
limited via an integrated soft start combined with controlled
temperature 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.