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ADP5501 Dataheets PDF



Part Number ADP5501
Manufacturers Analog Devices
Logo Analog Devices
Description Programmable Current Backlight Driver
Datasheet ADP5501 DatasheetADP5501 Datasheet (PDF)

10kΩ 10kΩ 2.2kΩ 2.2kΩ 07780-001 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 curren.

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10kΩ 10kΩ 2.2kΩ 2.2kΩ 07780-001 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 4.7µH 1µF 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 3.3V Figure 1. 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 mediaenabled 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. 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. ADP5501 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) ..........................................


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