Charge Pump, 7-Channel 2 Smart LED Driver with I C Interface Data Sheet ADP8861 FEATURES TYPICAL OPERATING CIRCUIT Charge pump with automatic gain selection of 1, 1.5, and 2 for maximum efficiency 7 independent, programmable LED drivers D1 D2 D3 D4 D5 D6 D7 7 drivers capable of 30 mA (typical) VIN 1 driver also capable of 60 mA (typical) C IN 1F Programmable maximum current limit (128 levels) VOUT VDDIO Standby mode for <1 A current consumption C OUT 1F 16 programmable fade in and fade out times nRST 0.1 sec to 5.5 sec C1+ VDDIO C1 Choose from linear, square, or cubic rates 1F ADP8861 C1 Fading override SDA 2 VDDIO I C-compatible interface for all programming C2+ Dedicated reset pin and built-in power-on reset (POR) C2 1F SCL C2 Short-circuit, overvoltage, and overtemperature protection VDDIO Internal soft start to limit inrush currents Input-to-output isolation during faults or shutdown nINT Operation down to V = 2.5 V with undervoltage lockout IN GND1 GND2 (UVLO) at V = 2.0 V IN Available in a small 20-ball, 2.15 mm 2.36 mm 0.6 mm Figure 1. WLCSP or a 20-lead, 4 mm 4 mm 0.75 mm LFCSP APPLICATIONS Mobile display backlighting Mobile phone keypad backlighting Dual RGB backlighting LED indication General backlighting of small format displays GENERAL DESCRIPTION The ADP8861 provides a powerful charge pump driver with This entire configuration is driven by a two-capacitor charge independent control of up to seven LEDs. These seven LEDs pump with gains of 1, 1.5, and 2. The charge pump is can be independently driven up to 30 mA (typical). The seventh capable of driving a maximum IOUT of 240 mA from a supply LED can also be driven to 60 mA (typical). All LEDs are pro- of 2.5 V to 5.5 V. A full suite of safety features, including short- grammable for maximum current and fade in/out times via circuit, overvoltage, and overtemperature protection, allows 2 the I C interface. These LEDs can also be combined into groups to easy implementation of a safe and robust design. Additionally, reduce the processor instructions during fade in/out. input inrush currents are limited via an integrated soft start combined with controlled input-to-output isolation. Rev. C Document Feedback 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20102017 Analog Devices, Inc. All rights reserved. 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. Technical Support www.analog.com 08391-001ADP8861 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Automated Fade In and Fade Out ............................................ 14 Applications ....................................................................................... 1 Backlight Turn On/Turn Off/Dim ........................................... 15 Typical Operating Circuit ................................................................ 1 Automatic Dim and Turn Off Timers ..................................... 15 General Description ......................................................................... 1 Fade Override ............................................................................. 16 Revision History ............................................................................... 2 Independent Sink Control ........................................................ 16 Specifications ..................................................................................... 3 Short-Circuit Protection Mode ................................................ 16 2 I C Timing Diagram .................................................................... 4 Overvoltage Protection .............................................................. 17 Absolute Maximum Ratings ............................................................ 5 Thermal Shutdown/Overtemperature Protection ................. 17 Maximum Temperature Ranges ................................................. 5 Interrupts ..................................................................................... 17 Thermal Resistance ...................................................................... 5 Applications Information .............................................................. 19 ESD Caution .................................................................................. 5 Determining the Transition Point of the Charge Pump ....... 19 Pin Configurations and Function Descriptions ........................... 6 Layout Guidelines....................................................................... 19 Typical Performance Characteristics ............................................. 7 Example Circuits ........................................................................ 20 2 Theory of Operation ...................................................................... 11 I C Programming and Digital Control ........................................ 21 Power Stage.................................................................................. 12 Backlight Register Descriptions ............................................... 26 Operating Modes ........................................................................ 13 Independent Sink Register Descriptions ................................. 31 Backlight Operating Levels ....................................................... 14 Outline Dimensions ....................................................................... 39 Backlight Maximum and Dim Settings ................................... 14 Ordering Guide .......................................................................... 40 REVISION HISTORY 2/2017Rev. B to Rev. C Updated Outline Dimensions ....................................................... 39 Changes to Ordering Guide .......................................................... 40 4/2012Rev. A to Rev. B Changes to Table 1 ............................................................................ 4 Updated Outline Dimensions ....................................................... 40 Changes to Ordering Guide .......................................................... 40 6/2010Rev. 0 to Rev. A Changes to Features Section and General Description Section . 1 Changes to Thermal Resistance Section and Table 3................... 5 Added Figure 4 Renumbered Sequentially .................................. 6 Changes to Table 4 ............................................................................ 6 Changes to Layout Guidelines Section ........................................ 19 Updated Outline Dimensions ....................................................... 39 Changes to Ordering Guide .......................................................... 40 4/2010Revision 0: Initial Version Rev. C Page 2 of 40