ADP5501 Analog Devices, ADP5501 Datasheet - Page 2

• Manufacturer Part Number: ADP5501
• Description: Programmable Current Backlight Driver with Ambient Light Sensor Input
• Manufacturer: Analog Devices

Specifications of ADP5501

• Vin Range: 2.7 to 5.5V
• Vout (v): 24 to 27
• Synchronous: No
• Package: 24-Lead LFCSP
• Led Configuration: Serial
• Topology: Inductive
• I2c Support: Yes
• Max Iout (ma): 30mA
• Brightness Control: I2C
• Switching Frequency: 1MHz
• Over Volt Protection (v): 24V

ADP5501
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Typical Operating Circuit ................................................................ 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 5
Pin Configuration and Function Descriptions ............................. 6
Typical Performance Characteristics ............................................. 7
Theory of Operation ........................................................................ 9
REVISION HISTORY
10/08—Revision 0: Initial Version
Thermal Resistance ...................................................................... 5
ESD Caution .................................................................................. 5
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
Rev. 0 | Page 2 of 28
Communicaton Interface .............................................................. 18
Register Map ................................................................................... 19
Detailed Register Descriptions ..................................................... 20
Applications Information .............................................................. 26
Outline Dimensions ....................................................................... 28
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
Converter Topology ................................................................... 26
PCB Layout ................................................................................. 27
Example Circuit .......................................................................... 27
Ordering Guide .......................................................................... 28