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Programmable Current Backlight Driver
with Ambient Light Sensor Input
ADP5501
FEATURES
TYPICAL OPERATING CIRCUIT
Efficient asynchronous boost converter for driving up to
6 white LEDs
2.7V TO 5.5V
1μF
2.7 V to 5.5 V input voltage range
128 programmable backlight LED current levels (30 mA
maximum)
Programmable backlight fade-in/fade-out times
I/O RAIL
1μF
1
21
4.7μH
2
PGND SW
VBAT
22
BST
23
BL_SNK
CAP_OUT 20
1μF
Programmable backlight dim and off times
16
VDDIO
GND 19
Ambient light sensing with autonomous backlight
adjustment
3 auxiliary LED current sinks
64 programmable auxiliary LED current levels (14 mA
5
4
3
15
SCL
SDA
INT
RST
ADP5501
GND 18
GND 24
CMP_IN 17
RGB
100nF
maximum)
Programmable auxiliary LED fade-in/fade-out times
NC NC NC NC NC NC
6 7 8 9 10 11
LED1
12
LED2
13
LED0
14
VBAT
Programmable auxiliary LED on and off times (allows
blinking)
I 2 C-compatible serial interface
Interrupt line for signaling an external processor (INT)
Hard reset (RST)
Current limit protection
Thermal overload protection
Available in small 4.0 mm × 4.0 mm, 24-lead LFCSP package
APPLICATIONS
Display backlight driver with ambient light sensor input and
control and multiple LED indicator sinks
GENERAL DESCRIPTION
The ADP5501 is a versatile, single-chip, white LED backlight
driver with programmable ambient light sensor input and
programmable LED current. This device is designed for media-
enabled handset applications. The ADP5501 uses an I 2 C?-
compatible serial interface and a single line interrupt to
communicate with the host processor.
3.3V
Figure 1.
The ADP5501 can detect ambient light levels and adjust the
backlight brightness accordingly, resulting in extended battery life.
Once configured, the ADP5501 is capable of controlling the
display backlight intensity, on/off timing, dimming, and fading
without the intervention of the main processor, which translates
into valuable battery power savings. The three auxiliary LEDs
are also capable of fading and are timed on and off via register
programming.
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 registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ?2008 Analog Devices, Inc. All rights reserved.
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