Charge Pump, 7-Channel
Fun Lighting LED Driver
ADP8863
TYPICAL OPERATING CIRCUIT
FEATURES
V
Automated blinking and funlight timing for each LED driver
16 programmable fade in and fade out times
0.1 sec to 5.5 sec
Selectable linear, square, or cubic fade rates
7 independent and programmable LED drivers
7 drivers capable of 30 mA (maximum)
1 driver also capable of 60 mA (maximum)
Programmable maximum current limit (128 levels)
Separate and independent controls for backlight LEDs
Backlight fade override
Up to two built-in comparator inputs with programmable
modes for ambient light sensing
ALS
PHOTO
SENSOR
D1
D2
D3
D4
D5
D6
D7 CMP_IN
0.1µF
VIN
IN
1µF
C
VOUT
C
VDDIO
OUT
1µF
C1+
ADP8863
nRST
nINT
SDA
SCL
C1
1µF
C1–
C2+
C2
1µF
C2–
Charge pump with automatic gain selection of 1×, 1.5×, and
2× for maximum efficiency
GND1
GND2
Standby mode for <1 μA current consumption
I2C-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 VIN = 2.5 V with undervoltage lockout
(UVLO) at VIN = 2.0 V
Figure 1.
Small lead frame chip scale package (LFCSP)
APPLICATIONS
LED indication
Funlight indicator lighting
Keypad backlighting
RGB LED color generation and mixing
General backlighting of small format displays
GENERAL DESCRIPTION
The ADP8863 combines a powerful charge pump driver with
advanced autonomous LED lighting features. It allows as
many as seven LEDs to be independently driven up to 30 mA
(maximum). The seventh LED can also be driven to 60 mA
(maximum). All LEDs are programmable for maximum current
and fade in/fade out times via the I2C interface.
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 IOUT of 240 mA from a supply of 2.5 V to
5.5 V. The device includes a variety of safety features including
short-circuit, overvoltage, and overtemperature protection.
These features allow 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.
Additionally, automated blinking routines can be independently
programmed and enabled for all seven LED channels. These
LEDs can also be combined into groups to reduce the processor
instructions.
The ADP8863 is available in a compact lead frame chip scale
package (LFCSP).
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
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 registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2010 Analog Devices, Inc. All rights reserved.
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