Backlight Driver. ADP5501 Datasheet

ADP5501 Driver. Datasheet pdf. Equivalent

Part ADP5501
Description Programmable Current Backlight Driver
Feature www.DataSheet4U.com Programmable Current Backlight Driver with Ambient Light Sensor Input ADP5501 T.
Manufacture Analog Devices
Datasheet
Download ADP5501 Datasheet



ADP5501
www.DataSheet4U.com
Programmable Current Backlight Driver
with Ambient Light Sensor Input
ADP5501
FEATURES
Efficient asynchronous boost converter for driving up to
6 white LEDs
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
Programmable backlight dim and off times
Ambient light sensing with autonomous backlight
adjustment
3 auxiliary LED current sinks
64 programmable auxiliary LED current levels (14 mA
maximum)
Programmable auxiliary LED fade-in/fade-out times
Programmable auxiliary LED on and off times (allows
blinking)
I2C-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
TYPICAL OPERATING CIRCUIT
2.7V TO 5.5V
1µF
I/O RAIL
1µF 4.7µH
2
1 PGND SW
21 VBAT
22
BST
23
BL_SNK
CAP_OUT 20
16 VDDIO
5 SCL
4 SDA
3 INT
15 RST
ADP5501
GND 19
GND 18
GND 24
CMP_IN 17
RGB
NC NC NC NC NC NC
6 7 8 9 10 11
LED1 LED2 LED0
12 13 14
1µF
100nF
VBAT
Figure 1.
3.3V
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 I2C®-
compatible serial interface and a single line interrupt to
communicate with the host processor.
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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.



ADP5501
ADP5501www.DataSheet4U.com
TABLE OF CONTENTS
Features .............................................................................................. 1 
Applications....................................................................................... 1 
Typical Operating Circuit................................................................ 1 
General Description ......................................................................... 1 
Revision History ............................................................................... 2 
Specifications..................................................................................... 3 
Absolute Maximum Ratings............................................................ 5 
Thermal Resistance ...................................................................... 5 
ESD Caution.................................................................................. 5 
Pin Configuration and Function Descriptions............................. 6 
Typical Performance Characteristics ............................................. 7 
Theory of Operation ........................................................................ 9 
Backlight Drive Control .............................................................. 9 
Backlight Operating Levels ....................................................... 10 
Backlight Maximum and Dim Settings ................................... 10 
Backlight Turn-On/Turn-Off/Dim .......................................... 10 
Automatic Dim and Turn-Off Timers..................................... 11 
Linear Backlight Fade-In and Fade-Out.................................. 11 
REVISION HISTORY
10/08—Revision 0: Initial Version
Fade Override ............................................................................. 13 
Advanced Fading (Square)........................................................ 13 
Advanced Fading (Cubic 1 and Cubic 2) ................................ 13 
Ambient Light Sensing .............................................................. 14 
Automatic Backlight Adjustment............................................. 14 
LED Current Sinks ..................................................................... 15 
Interrupt Output (INT) ............................................................. 17 
Reset Input (RST)....................................................................... 17 
Communicaton Interface .............................................................. 18 
Register Map ................................................................................... 19 
Detailed Register Descriptions ..................................................... 20 
Applications Information .............................................................. 26 
Converter Topology ................................................................... 26 
PCB Layout ................................................................................. 27 
Example Circuit.......................................................................... 27 
Outline Dimensions ....................................................................... 28 
Ordering Guide .......................................................................... 28 
Rev. 0 | Page 2 of 28





@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)